{ "title": "Tree growth rates by species, A to Z", "page": "https://bluewhaletrees.com/articles/growth-rates/", "license": { "name": "Creative Commons Attribution 4.0", "short": "CC BY 4.0", "url": "https://creativecommons.org/licenses/by/4.0/" }, "attribution": "Blue Whale Trees, https://bluewhaletrees.com/articles/growth-rates/", "updated": "2026-10-21", "row": "one tree or shrub the nursery grows", "rows_count": 364, "columns": [ { "name": "slug", "means": "the plant page's address, https://bluewhaletrees.com/plants//" }, { "name": "name", "means": "the common name the page uses" }, { "name": "botanical", "means": "the botanical name" }, { "name": "form", "means": "shrub, small-tree, medium-tree or large-tree, the page's size class" }, { "name": "growth_class", "means": "slow, medium or fast, the plant page's class by the Missouri Department of Conservation's key: 12 inches or less of height a year is slow, 12 to 24 medium, 24 or more fast" }, { "name": "feet_a_year", "means": "the feet of height a young tree of that class adds in a year on an average site in the growth estimator, 1, 1.5 or 2.75" }, { "name": "height_min_ft", "means": "the low end of the mature height the plant page gives, in feet" }, { "name": "height_max_ft", "means": "the high end of the mature height the plant page gives, in feet; the estimator's mature height" }, { "name": "years_to_20_ft", "means": "the years a 3-foot sapling takes to pass 20 feet on an average site by the estimator's rules; empty when the plant tops out at 20 feet or under" }, { "name": "years_to_12_in_trunk", "means": "for a tree, the years a 3-foot sapling takes to reach a 12-inch trunk at 4.5 feet on an average site in the open, by the tree age estimator's rules. Empty for a shrub, or where the trunk never gets there within 200 years" }, { "name": "years_to_24_in_trunk", "means": "the same for a 24-inch trunk; empty for a shrub, or where the trunk never gets there within 200 years" }, { "name": "shrub_years_to_half_height", "means": "for a shrub, the years from the growth estimator's starting height to half its mature height on an average site, by the tree age estimator's rules. Empty for a tree" }, { "name": "shrub_years_to_90pct_height", "means": "for a shrub, the years from the same start to 90 percent of its mature height, past which the height says little about the age; empty for a tree" }, { "name": "shrub_stem_years_per_inch_low", "means": "for a shrub, the fewest years an inch of thickest-stem diameter by the tree age estimator's rule, measured rings for four shrubs, the class band otherwise; empty for a tree" }, { "name": "shrub_stem_years_per_inch_high", "means": "the most years an inch of thickest-stem diameter by the same rule; the two give a stem's age range, its low end the shrub's least age. Empty for a tree" }, { "name": "zone_min", "means": "the coldest hardiness zone the page gives" }, { "name": "zone_max", "means": "the warmest hardiness zone the page gives" } ], "rows": [ { "slug": "alabama-azalea", "name": "Alabama Azalea", "botanical": "Rhododendron alabamense", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 9 }, { "slug": "alabama-croton", "name": "Alabama Croton", "botanical": "Croton alabamensis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 8 }, { "slug": "alabama-snow-wreath", "name": "Alabama Snow-wreath", "botanical": "Neviusia alabamensis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 8 }, { "slug": "alderleaf-buckthorn", "name": "Alderleaf Buckthorn", "botanical": "Rhamnus alnifolia", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 7 }, { "slug": "allegheny-chinquapin", "name": "Allegheny Chinquapin", "botanical": "Castanea pumila", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "allegheny-plum", "name": "Allegheny Plum", "botanical": "Prunus alleghaniensis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 8 }, { "slug": "allegheny-serviceberry", "name": "Allegheny Serviceberry", "botanical": "Amelanchier laevis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "american-basswood", "name": "American Basswood (Linden)", "botanical": "Tilia americana", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 90, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 67, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "american-beautyberry", "name": "American Beautyberry", "botanical": "Callicarpa americana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 10 }, { "slug": "american-beech", "name": "American Beech", "botanical": "Fagus grandifolia", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "american-chestnut", "name": "American Chestnut", "botanical": "Castanea dentata", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 8, "years_to_12_in_trunk": 26, "years_to_24_in_trunk": 59, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "american-crabapple", "name": "American Crabapple", "botanical": "Malus coronaria", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "american-fly-honeysuckle", "name": "American Fly Honeysuckle", "botanical": "Lonicera canadensis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 7 }, { "slug": "american-hazelnut", "name": "American Hazelnut", "botanical": "Corylus americana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 9 }, { "slug": "american-holly", "name": "American Holly, select line", "botanical": "Ilex opaca", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "american-hornbeam", "name": "American Hornbeam (Musclewood)", "botanical": "Carpinus caroliniana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 35, "years_to_20_ft": 20, "years_to_12_in_trunk": 57, "years_to_24_in_trunk": 136, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "american-mountain-ash", "name": "American Mountain Ash", "botanical": "Sorbus americana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 7 }, { "slug": "american-persimmon", "name": "American Persimmon", "botanical": "Diospyros virginiana", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 35, "height_max_ft": 60, "years_to_20_ft": 18, "years_to_12_in_trunk": 51, "years_to_24_in_trunk": 120, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "american-plum", "name": "American Plum", "botanical": "Prunus americana", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 9, "years_to_12_in_trunk": 27, "years_to_24_in_trunk": 60, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "american-smoketree", "name": "American Smoketree", "botanical": "Cotinus obovatus", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "american-snowbell", "name": "American Snowbell", "botanical": "Styrax americanus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 10 }, { "slug": "arkansas-oak", "name": "Arkansas Oak", "botanical": "Quercus arkansana", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "arrowwood-viburnum", "name": "Arrowwood Viburnum", "botanical": "Viburnum dentatum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 2, "zone_max": 8 }, { "slug": "ashe-magnolia", "name": "Ashe's Magnolia", "botanical": "Magnolia ashei", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 10, "height_max_ft": 30, "years_to_20_ft": 8, "years_to_12_in_trunk": 26, "years_to_24_in_trunk": 59, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "atlantic-white-cedar", "name": "Atlantic White Cedar", "botanical": "Chamaecyparis thyoides", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "bald-cypress", "name": "Bald Cypress", "botanical": "Taxodium distichum", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 10 }, { "slug": "bartram-serviceberry", "name": "Bartram's Serviceberry", "botanical": "Amelanchier bartramiana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 2, "zone_max": 7 }, { "slug": "beach-plum", "name": "Beach Plum", "botanical": "Prunus maritima", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "beaked-hazelnut", "name": "Beaked Hazelnut", "botanical": "Corylus cornuta", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 4, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 3.9, "shrub_stem_years_per_inch_high": 25.4, "zone_min": 3, "zone_max": 8 }, { "slug": "bear-huckleberry", "name": "Bear Huckleberry", "botanical": "Gaylussacia ursina", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 8 }, { "slug": "bear-oak", "name": "Bear Oak (Scrub Oak)", "botanical": "Quercus ilicifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 8, "shrub_years_to_90pct_height": 26, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "bigleaf-magnolia", "name": "Bigleaf Magnolia", "botanical": "Magnolia macrophylla", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 30, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "bigleaf-snowbell", "name": "Bigleaf Snowbell", "botanical": "Styrax grandifolius", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 8, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 8, "shrub_years_to_90pct_height": 26, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 9 }, { "slug": "bigleaf-witch-hazel", "name": "Bigleaf Witch Hazel", "botanical": "Hamamelis ovalis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 13, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 8 }, { "slug": "bitternut-hickory", "name": "Bitternut Hickory", "botanical": "Carya cordiformis", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "black-cherry", "name": "Black Cherry", "botanical": "Prunus serotina", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 48, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 9 }, { "slug": "black-chokeberry", "name": "Black Chokeberry", "botanical": "Aronia melanocarpa", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "black-elderberry", "name": "Black Elderberry", "botanical": "Sambucus canadensis", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 3, "zone_max": 9 }, { "slug": "black-gum", "name": "Black Gum (Tupelo)", "botanical": "Nyssa sylvatica", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 18, "years_to_12_in_trunk": 50, "years_to_24_in_trunk": 116, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "black-hickory", "name": "Black Hickory", "botanical": "Carya texana", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 30, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "black-huckleberry", "name": "Black Huckleberry", "botanical": "Gaylussacia baccata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 3, "zone_max": 7 }, { "slug": "black-locust", "name": "Black Locust", "botanical": "Robinia pseudoacacia", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "black-maple", "name": "Black Maple", "botanical": "Acer nigrum", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 75, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 70, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "black-oak", "name": "Black Oak", "botanical": "Quercus velutina", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "black-walnut", "name": "Black Walnut", "botanical": "Juglans nigra", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 70, "height_max_ft": 100, "years_to_20_ft": 7, "years_to_12_in_trunk": 20, "years_to_24_in_trunk": 46, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "blackhaw", "name": "Blackhaw Viburnum", "botanical": "Viburnum prunifolium", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 9 }, { "slug": "blackjack-oak", "name": "Blackjack Oak", "botanical": "Quercus marilandica", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "bladdernut", "name": "Bladdernut", "botanical": "Staphylea trifolia", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 8, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 4, "zone_max": 8 }, { "slug": "blue-ash", "name": "Blue Ash", "botanical": "Fraxinus quadrangulata", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 70, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 71, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 7 }, { "slug": "blue-ridge-st-johns-wort", "name": "Blue Ridge St. John's-wort", "botanical": "Hypericum buckleyi", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "blueberry-hawthorn", "name": "Blueberry Hawthorn", "botanical": "Crataegus brachyacantha", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "bluejack-oak", "name": "Bluejack Oak", "botanical": "Quercus incana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "bluff-oak", "name": "Bluff Oak", "botanical": "Quercus austrina", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "bog-spicebush", "name": "Bog Spicebush", "botanical": "Lindera subcoriacea", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 13, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 10, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 9 }, { "slug": "bottlebrush-buckeye", "name": "Bottlebrush Buckeye", "botanical": "Aesculus parviflora", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 8, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 9 }, { "slug": "box-huckleberry", "name": "Box Huckleberry", "botanical": "Gaylussacia brachycera", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "boynton-oak", "name": "Boynton Oak", "botanical": "Quercus boyntonii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 8, "shrub_years_to_90pct_height": 26, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "bracted-arrowwood", "name": "Bracted Arrowwood", "botanical": "Viburnum bracteatum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 8 }, { "slug": "rose-locust", "name": "Bristly Locust (Rose Locust)", "botanical": "Robinia hispida", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 5, "zone_max": 8 }, { "slug": "broom-crowberry", "name": "Broom Crowberry", "botanical": "Corema conradii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 7 }, { "slug": "buckthorn-bully", "name": "Buckthorn Bully", "botanical": "Sideroxylon lycioides", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 10, "height_max_ft": 45, "years_to_20_ft": 7, "years_to_12_in_trunk": 23, "years_to_24_in_trunk": 56, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "buckwheat-tree", "name": "Buckwheat Tree", "botanical": "Cliftonia monophylla", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 12, "height_max_ft": 18, "years_to_20_ft": null, "years_to_12_in_trunk": 67, "years_to_24_in_trunk": 147, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "bur-oak", "name": "Bur Oak", "botanical": "Quercus macrocarpa", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "butternut", "name": "Butternut", "botanical": "Juglans cinerea", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 7 }, { "slug": "buttonbush", "name": "Buttonbush", "botanical": "Cephalanthus occidentalis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 10 }, { "slug": "canada-buffaloberry", "name": "Canada Buffaloberry", "botanical": "Shepherdia canadensis", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 8, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 2, "zone_max": 8 }, { "slug": "canada-plum", "name": "Canada Plum", "botanical": "Prunus nigra", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 6 }, { "slug": "canada-yew", "name": "Canada Yew", "botanical": "Taxus canadensis", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 2, "zone_max": 7 }, { "slug": "carolina-bog-laurel", "name": "Carolina Bog Laurel", "botanical": "Kalmia carolina", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "carolina-buckthorn", "name": "Carolina Buckthorn", "botanical": "Frangula caroliniana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "carolina-hemlock", "name": "Carolina Hemlock", "botanical": "Tsuga caroliniana", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 18, "years_to_12_in_trunk": 51, "years_to_24_in_trunk": 120, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 7 }, { "slug": "carolina-laurelcherry", "name": "Carolina Laurelcherry", "botanical": "Prunus caroliniana", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 15, "height_max_ft": 40, "years_to_20_ft": 7, "years_to_12_in_trunk": 24, "years_to_24_in_trunk": 57, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "carolina-silverbell", "name": "Carolina Silverbell", "botanical": "Halesia tetraptera", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "carolina-st-johns-wort", "name": "Carolina St. John's-wort", "botanical": "Hypericum nitidum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 9 }, { "slug": "catawba-rhododendron", "name": "Catawba Rhododendron", "botanical": "Rhododendron catawbiense", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "catberry", "name": "Catberry", "botanical": "Ilex mucronata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 3, "zone_max": 7 }, { "slug": "cedar-elm", "name": "Cedar Elm", "botanical": "Ulmus crassifolia", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "chalk-maple", "name": "Chalk Maple", "botanical": "Acer leucoderme", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 25, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "chapman-oak", "name": "Chapman Oak", "botanical": "Quercus chapmanii", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 24, "years_to_12_in_trunk": 63, "years_to_24_in_trunk": 143, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "chapman-st-johns-wort", "name": "Chapman's St. John's-wort", "botanical": "Hypericum chapmanii", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 7, "height_max_ft": 13, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 10, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 9 }, { "slug": "cherrybark-oak", "name": "Cherrybark Oak, Wye Island line", "botanical": "Quercus pagoda", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 80, "height_max_ft": 120, "years_to_20_ft": 7, "years_to_12_in_trunk": 20, "years_to_24_in_trunk": 44, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "chestnut-oak", "name": "Chestnut Oak", "botanical": "Quercus montana", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 50, "height_max_ft": 70, "years_to_20_ft": 18, "years_to_12_in_trunk": 50, "years_to_24_in_trunk": 116, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "chickasaw-plum", "name": "Chickasaw Plum", "botanical": "Prunus angustifolia", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 4, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 28, "years_to_24_in_trunk": 62, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "chinese-chestnut", "name": "Chinese Chestnut", "botanical": "Castanea mollissima", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "chinquapin-oak", "name": "Chinquapin Oak", "botanical": "Quercus muehlenbergii", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "chokecherry", "name": "Chokecherry", "botanical": "Prunus virginiana", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 10 }, { "slug": "cinnamon-clethra", "name": "Cinnamon Clethra", "botanical": "Clethra acuminata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 7 }, { "slug": "clammy-locust", "name": "Clammy Locust", "botanical": "Robinia viscosa", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "climbing-fetterbush", "name": "Climbing Fetterbush", "botanical": "Pieris phillyreifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "climbing-prairie-rose", "name": "Climbing Prairie Rose", "botanical": "Rosa setigera", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 4, "zone_max": 8 }, { "slug": "clusterspike-indigobush", "name": "Clusterspike Indigobush", "botanical": "Amorpha herbacea", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 4, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 10 }, { "slug": "coastal-azalea", "name": "Coastal Azalea", "botanical": "Rhododendron atlanticum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 8 }, { "slug": "cockspur-hawthorn", "name": "Cockspur Hawthorn", "botanical": "Crataegus crus-galli", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "common-hackberry", "name": "Common Hackberry", "botanical": "Celtis occidentalis", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "common-hoptree", "name": "Common Hoptree (Wafer Ash)", "botanical": "Ptelea trifoliata", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 66, "years_to_24_in_trunk": 146, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "common-prickly-ash", "name": "Common Prickly Ash (Toothache Tree)", "botanical": "Zanthoxylum americanum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "conjurers-nut", "name": "Conjurer's-nut", "botanical": "Nestronia umbellula", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 4, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 8 }, { "slug": "corkwood", "name": "Corkwood", "botanical": "Leitneria floridana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "creeping-blueberry", "name": "Creeping Blueberry", "botanical": "Vaccinium crassifolium", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 1, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 9 }, { "slug": "creeping-juniper", "name": "Creeping Juniper", "botanical": "Juniperus horizontalis", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 2, "zone_max": 9 }, { "slug": "cucumber-magnolia", "name": "Cucumber Magnolia", "botanical": "Magnolia acuminata", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 48, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "cumberland-azalea", "name": "Cumberland Azalea", "botanical": "Rhododendron cumberlandense", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 7, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "cumberland-rosemary", "name": "Cumberland Rosemary", "botanical": "Conradina verticillata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 1, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "dahoon", "name": "Dahoon", "botanical": "Ilex cassine", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "dangleberry", "name": "Dangleberry", "botanical": "Gaylussacia frondosa", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 9 }, { "slug": "deerberry", "name": "Deerberry", "botanical": "Vaccinium stamineum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "delta-post-oak", "name": "Delta Post Oak", "botanical": "Quercus similis", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "devils-walking-stick", "name": "Devil's Walking Stick", "botanical": "Aralia spinosa", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 28, "years_to_24_in_trunk": 62, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "devilwood", "name": "Devilwood", "botanical": "Cartrema americana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "downy-arrowwood", "name": "Downy Arrowwood", "botanical": "Viburnum rafinesqueanum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 3, "zone_max": 8 }, { "slug": "downy-hawthorn", "name": "Downy Hawthorn", "botanical": "Crataegus mollis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "downy-serviceberry", "name": "Downy Serviceberry", "botanical": "Amelanchier arborea", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "durand-oak", "name": "Durand Oak", "botanical": "Quercus sinuata", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 75, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 70, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "dwarf-chinquapin-oak", "name": "Dwarf Chinquapin Oak", "botanical": "Quercus prinoides", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "dwarf-hackberry", "name": "Dwarf Hackberry", "botanical": "Celtis tenuifolia", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "dwarf-live-oak", "name": "Dwarf Live Oak", "botanical": "Quercus minima", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 10 }, { "slug": "dwarf-pawpaw", "name": "Dwarf Pawpaw", "botanical": "Asimina parviflora", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 10 }, { "slug": "dwarf-tupelo", "name": "Dwarf Tupelo", "botanical": "Nyssa ursina", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 13, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 10 }, { "slug": "dwarf-witch-alder", "name": "Dwarf Witch Alder", "botanical": "Fothergilla gardenii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "eastern-leatherwood", "name": "Eastern Leatherwood", "botanical": "Dirca palustris", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 9 }, { "slug": "eastern-red-cedar", "name": "Eastern Red Cedar", "botanical": "Juniperus virginiana", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 9 }, { "slug": "eastern-redbud", "name": "Eastern Redbud", "botanical": "Cercis canadensis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "eastern-wahoo", "name": "Eastern Wahoo", "botanical": "Euonymus atropurpureus", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 9 }, { "slug": "elliott-blueberry", "name": "Elliott's Blueberry", "botanical": "Vaccinium elliottii", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "farkleberry", "name": "Farkleberry", "botanical": "Vaccinium arboreum", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "fevertree", "name": "Fevertree", "botanical": "Pinckneya bracteata", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 41, "years_to_24_in_trunk": 91, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "flag-pawpaw", "name": "Flag Pawpaw", "botanical": "Asimina obovata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 10 }, { "slug": "flame-azalea", "name": "Flame Azalea", "botanical": "Rhododendron calendulaceum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 4, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 7 }, { "slug": "flatwoods-plum", "name": "Flatwoods Plum", "botanical": "Prunus umbellata", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 41, "years_to_24_in_trunk": 91, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 10 }, { "slug": "florida-anise", "name": "Florida Anise", "botanical": "Illicium floridanum", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 6, "zone_max": 10 }, { "slug": "florida-bully", "name": "Florida Bully", "botanical": "Sideroxylon reclinatum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 5, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 10 }, { "slug": "florida-flame-azalea", "name": "Florida Flame Azalea", "botanical": "Rhododendron austrinum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 9 }, { "slug": "florida-leucothoe", "name": "Florida Leucothoe", "botanical": "Agarista populifolia", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "florida-maple", "name": "Florida Maple", "botanical": "Acer floridanum", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "florida-swamp-privet", "name": "Florida Swamp Privet", "botanical": "Forestiera segregata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 10 }, { "slug": "florida-torreya", "name": "Florida Torreya", "botanical": "Torreya taxifolia", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 30, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "florida-willow", "name": "Florida Willow", "botanical": "Salix floridana", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 8, "zone_max": 10 }, { "slug": "florida-yew", "name": "Florida Yew", "botanical": "Taxus floridana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 12, "height_max_ft": 25, "years_to_20_ft": 24, "years_to_12_in_trunk": 63, "years_to_24_in_trunk": 143, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "flowering-dogwood", "name": "Flowering Dogwood", "botanical": "Cornus florida", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "four-petal-pawpaw", "name": "Four-petal Pawpaw", "botanical": "Asimina tetramera", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 9, "zone_max": 10 }, { "slug": "fragrant-sumac", "name": "Fragrant Sumac", "botanical": "Rhus aromatica", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 9 }, { "slug": "franklin-tree", "name": "Franklin Tree", "botanical": "Franklinia alatamaha", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 24, "years_to_12_in_trunk": 63, "years_to_24_in_trunk": 143, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "fraser-fir", "name": "Fraser Fir", "botanical": "Abies fraseri", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 30, "height_max_ft": 55, "years_to_20_ft": 18, "years_to_12_in_trunk": 51, "years_to_24_in_trunk": 123, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 7 }, { "slug": "fraser-magnolia", "name": "Fraser Magnolia", "botanical": "Magnolia fraseri", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "georgia-bully", "name": "Georgia Bully", "botanical": "Sideroxylon thornei", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 9 }, { "slug": "georgia-indigobush", "name": "Georgia Indigobush", "botanical": "Amorpha georgiana", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "georgia-oak", "name": "Georgia Oak", "botanical": "Quercus georgiana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 25, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "georgia-plume", "name": "Georgia Plume", "botanical": "Elliottia racemosa", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": 69, "years_to_24_in_trunk": 149, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "godfrey-swamp-privet", "name": "Godfrey's Swamp Privet", "botanical": "Forestiera godfreyi", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 13, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 8, "zone_max": 9 }, { "slug": "golden-heather", "name": "Golden Heather", "botanical": "Hudsonia ericoides", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "golden-st-johns-wort", "name": "Golden St. John's-wort", "botanical": "Hypericum frondosum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 8 }, { "slug": "granite-gooseberry", "name": "Granite Gooseberry", "botanical": "Ribes curvatum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "gray-birch", "name": "Gray Birch", "botanical": "Betula populifolia", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 7, "years_to_12_in_trunk": 24, "years_to_24_in_trunk": 57, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "gray-dogwood", "name": "Gray Dogwood", "botanical": "Cornus racemosa", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 4, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "green-hawthorn", "name": "Green Hawthorn", "botanical": "Crataegus viridis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 35, "years_to_20_ft": 13, "years_to_12_in_trunk": 35, "years_to_24_in_trunk": 84, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "gum-bumelia", "name": "Gum Bumelia", "botanical": "Sideroxylon lanuginosum", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 45, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 80, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "hairy-blueberry", "name": "Hairy Blueberry", "botanical": "Vaccinium hirsutum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 8 }, { "slug": "hairy-laurel", "name": "Hairy Laurel", "botanical": "Kalmia hirsuta", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "harbison-hawthorn", "name": "Harbison's Hawthorn", "botanical": "Crataegus harbisonii", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 26, "years_to_20_ft": 16, "years_to_12_in_trunk": 38, "years_to_24_in_trunk": 88, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "hercules-club", "name": "Hercules' Club", "botanical": "Zanthoxylum clava-herculis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "hillside-blueberry", "name": "Hillside Blueberry", "botanical": "Vaccinium pallidum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "hobblebush", "name": "Hobblebush", "botanical": "Viburnum lantanoides", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 6 }, { "slug": "honeycup", "name": "Honeycup", "botanical": "Zenobia pulverulenta", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 9 }, { "slug": "hop-hornbeam", "name": "Hop Hornbeam", "botanical": "Ostrya virginiana", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 25, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "hortulan-plum", "name": "Hortulan Plum", "botanical": "Prunus hortulana", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 7 }, { "slug": "indigobush", "name": "Indigobush (False Indigo)", "botanical": "Amorpha fruticosa", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 4, "zone_max": 9 }, { "slug": "inkberry", "name": "Inkberry", "botanical": "Ilex glabra", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 5, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 10 }, { "slug": "kentucky-coffeetree", "name": "Kentucky Coffeetree", "botanical": "Gymnocladus dioicus", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "lanceleaf-buckthorn", "name": "Lanceleaf Buckthorn", "botanical": "Rhamnus lanceolata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 8 }, { "slug": "laurel-oak", "name": "Laurel Oak", "botanical": "Quercus hemisphaerica", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 7, "years_to_12_in_trunk": 22, "years_to_24_in_trunk": 52, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "leadplant", "name": "Leadplant", "botanical": "Amorpha canescens", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 2, "zone_max": 8 }, { "slug": "little-walnut", "name": "Little Walnut", "botanical": "Juglans microcarpa", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "littlehip-hawthorn", "name": "Littlehip Hawthorn", "botanical": "Crataegus spathulata", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 26, "years_to_20_ft": 24, "years_to_12_in_trunk": 62, "years_to_24_in_trunk": 142, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "littleleaf-buckbrush", "name": "Littleleaf Buckbrush", "botanical": "Ceanothus microphyllus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 10 }, { "slug": "live-oak", "name": "Live Oak", "botanical": "Quercus virginiana", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "lloyd-st-johns-wort", "name": "Lloyd's St. John's-wort", "botanical": "Hypericum lloydii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 9 }, { "slug": "loblolly-bay", "name": "Loblolly Bay", "botanical": "Gordonia lasianthus", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 35, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "long-stalked-holly", "name": "Long-stalked Holly", "botanical": "Ilex collina", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 13, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 16, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 7 }, { "slug": "longleaf-pine", "name": "Longleaf Pine", "botanical": "Pinus palustris", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 120, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 64, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "maleberry", "name": "Maleberry", "botanical": "Lyonia ligustrina", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "maple-leaf-oak", "name": "Maple-leaf Oak", "botanical": "Quercus acerifolia", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "mapleleaf-viburnum", "name": "Mapleleaf Viburnum", "botanical": "Viburnum acerifolium", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "may-white-azalea", "name": "May White Azalea", "botanical": "Rhododendron eastmanii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 20, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "mayhaw", "name": "Mayhaw", "botanical": "Crataegus aestivalis", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 10 }, { "slug": "mexican-plum", "name": "Mexican Plum", "botanical": "Prunus mexicana", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 35, "years_to_20_ft": 13, "years_to_12_in_trunk": 35, "years_to_24_in_trunk": 84, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "miccosukee-gooseberry", "name": "Miccosukee Gooseberry", "botanical": "Ribes echinellum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "michaux-sumac", "name": "Michaux's Sumac", "botanical": "Rhus michauxii", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 8 }, { "slug": "minnie-bush", "name": "Minnie-bush", "botanical": "Rhododendron pilosum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 7 }, { "slug": "mockernut-hickory", "name": "Mockernut Hickory", "botanical": "Carya tomentosa", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "mountain-bush-honeysuckle", "name": "Mountain Bush-honeysuckle", "botanical": "Diervilla rivularis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 8 }, { "slug": "mountain-camellia", "name": "Mountain Camellia (Mountain Stewartia)", "botanical": "Stewartia ovata", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 66, "years_to_24_in_trunk": 146, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "mountain-doghobble", "name": "Mountain Doghobble", "botanical": "Leucothoe fontanesiana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 8 }, { "slug": "mountain-fetterbush", "name": "Mountain Fetterbush", "botanical": "Pieris floribunda", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 6 }, { "slug": "mountain-indigobush", "name": "Mountain Indigobush", "botanical": "Amorpha glabra", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 7, "zone_max": 8 }, { "slug": "mountain-laurel", "name": "Mountain Laurel", "botanical": "Kalmia latifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 5, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 13.2, "shrub_stem_years_per_inch_high": 45.2, "zone_min": 4, "zone_max": 9 }, { "slug": "mountain-maple", "name": "Mountain Maple", "botanical": "Acer spicatum", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 24, "years_to_12_in_trunk": 63, "years_to_24_in_trunk": 143, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 7 }, { "slug": "mountain-sweetbells", "name": "Mountain Sweetbells", "botanical": "Eubotrys recurva", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "mountain-winterberry", "name": "Mountain Winterberry", "botanical": "Ilex montana", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "mountain-witch-alder", "name": "Mountain Witch Alder", "botanical": "Fothergilla major", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "myrtle-dahoon", "name": "Myrtle Dahoon", "botanical": "Ilex myrtifolia", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "myrtle-oak", "name": "Myrtle Oak", "botanical": "Quercus myrtifolia", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "nannyberry", "name": "Nannyberry", "botanical": "Viburnum lentago", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 18, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 5, "shrub_years_to_90pct_height": 15, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 2, "zone_max": 8 }, { "slug": "nantucket-serviceberry", "name": "Nantucket Serviceberry", "botanical": "Amelanchier nantucketensis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "netted-pawpaw", "name": "Netted Pawpaw", "botanical": "Asimina reticulata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 10 }, { "slug": "new-jersey-tea", "name": "New Jersey Tea", "botanical": "Ceanothus americanus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "ninebark", "name": "Ninebark", "botanical": "Physocarpus opulifolius", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 5, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 2, "zone_max": 8 }, { "slug": "northern-bayberry", "name": "Northern Bayberry", "botanical": "Morella pensylvanica", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 7 }, { "slug": "northern-catalpa", "name": "Northern Catalpa", "botanical": "Catalpa speciosa", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "pecan", "name": "Northern Pecan", "botanical": "Carya illinoinensis", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 70, "height_max_ft": 100, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 66, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "northern-pin-oak", "name": "Northern Pin Oak", "botanical": "Quercus ellipsoidalis", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 70, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 71, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 7 }, { "slug": "northern-red-oak", "name": "Northern Red Oak", "botanical": "Quercus rubra", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 75, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 49, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "northern-white-cedar", "name": "Northern White Cedar", "botanical": "Thuja occidentalis", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 18, "years_to_12_in_trunk": 51, "years_to_24_in_trunk": 120, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 7 }, { "slug": "nutmeg-hickory", "name": "Nutmeg Hickory", "botanical": "Carya myristiciformis", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 80, "height_max_ft": 100, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 106, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "nuttall-oak", "name": "Nuttall Oak", "botanical": "Quercus texana", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 48, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "oconee-azalea", "name": "Oconee Azalea", "botanical": "Rhododendron flammeum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 8, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 9 }, { "slug": "odorless-bayberry", "name": "Odorless Bayberry", "botanical": "Morella inodora", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 10 }, { "slug": "ogeechee-tupelo", "name": "Ogeechee Tupelo", "botanical": "Nyssa ogeche", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 25, "height_max_ft": 45, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 80, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "oglethorpe-oak", "name": "Oglethorpe Oak", "botanical": "Quercus oglethorpensis", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "ohio-buckeye", "name": "Ohio Buckeye", "botanical": "Aesculus glabra", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 7 }, { "slug": "ouachita-indigobush", "name": "Ouachita Indigobush", "botanical": "Amorpha ouachitensis", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 5, "zone_max": 8 }, { "slug": "overcup-oak", "name": "Overcup Oak", "botanical": "Quercus lyrata", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "ozark-chinquapin", "name": "Ozark Chinquapin", "botanical": "Castanea ozarkensis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "ozark-witch-hazel", "name": "Ozark Witch Hazel", "botanical": "Hamamelis vernalis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "pagoda-dogwood", "name": "Pagoda Dogwood", "botanical": "Cornus alternifolia", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 24, "years_to_12_in_trunk": 63, "years_to_24_in_trunk": 143, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "painted-buckeye", "name": "Painted Buckeye", "botanical": "Aesculus sylvatica", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 41, "years_to_24_in_trunk": 91, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 8 }, { "slug": "parsley-hawthorn", "name": "Parsley Hawthorn", "botanical": "Crataegus marshallii", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 7, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "pawpaw", "name": "Pawpaw", "botanical": "Asimina triloba", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "pear-hawthorn", "name": "Pear Hawthorn", "botanical": "Crataegus calpodendron", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 7, "height_max_ft": 23, "years_to_20_ft": 27, "years_to_12_in_trunk": 64, "years_to_24_in_trunk": 144, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "piedmont-azalea", "name": "Piedmont Azalea", "botanical": "Rhododendron canescens", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 10 }, { "slug": "piedmont-rhododendron", "name": "Piedmont Rhododendron", "botanical": "Rhododendron minus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "pignut-hickory", "name": "Pignut Hickory", "botanical": "Carya glabra", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "pin-cherry", "name": "Pin Cherry", "botanical": "Prunus pensylvanica", "form": "small-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 15, "height_max_ft": 40, "years_to_20_ft": 7, "years_to_12_in_trunk": 24, "years_to_24_in_trunk": 57, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 7 }, { "slug": "pin-oak", "name": "Pin Oak", "botanical": "Quercus palustris", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "pinkshell-azalea", "name": "Pinkshell Azalea", "botanical": "Rhododendron vaseyi", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 5, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 7 }, { "slug": "pinxterbloom-azalea", "name": "Pinxterbloom Azalea", "botanical": "Rhododendron periclymenoides", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 9 }, { "slug": "piratebush", "name": "Piratebush", "botanical": "Buckleya distichophylla", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 7 }, { "slug": "plateau-live-oak", "name": "Plateau Live Oak", "botanical": "Quercus fusiformis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 13, "years_to_12_in_trunk": 34, "years_to_24_in_trunk": 82, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "plumleaf-azalea", "name": "Plumleaf Azalea", "botanical": "Rhododendron prunifolium", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 8, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 9 }, { "slug": "pond-cypress", "name": "Pond Cypress", "botanical": "Taxodium ascendens", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 70, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 71, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "pond-pine", "name": "Pond Pine", "botanical": "Pinus serotina", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 71, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "pondberry", "name": "Pondberry", "botanical": "Lindera melissifolia", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "pondspice", "name": "Pondspice", "botanical": "Litsea aestivalis", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "possumhaw", "name": "Possumhaw", "botanical": "Ilex decidua", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 7, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "possumhaw-viburnum", "name": "Possumhaw Viburnum", "botanical": "Viburnum nudum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "post-oak", "name": "Post Oak", "botanical": "Quercus stellata", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 35, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "prairie-crabapple", "name": "Prairie Crabapple", "botanical": "Malus ioensis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 8 }, { "slug": "prairie-redroot", "name": "Prairie Redroot", "botanical": "Ceanothus herbaceus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 8 }, { "slug": "pygmy-fringetree", "name": "Pygmy Fringetree", "botanical": "Chionanthus pygmaeus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 7, "zone_max": 10 }, { "slug": "pyramid-magnolia", "name": "Pyramid Magnolia", "botanical": "Magnolia pyramidata", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "rabbiteye-blueberry", "name": "Rabbiteye Blueberry", "botanical": "Vaccinium virgatum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "red-buckeye", "name": "Red Buckeye", "botanical": "Aesculus pavia", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "red-chokeberry", "name": "Red Chokeberry", "botanical": "Aronia arbutifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 14, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 3, "zone_max": 9 }, { "slug": "red-elderberry", "name": "Red Elderberry", "botanical": "Sambucus racemosa", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 8, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 3, "zone_max": 7 }, { "slug": "red-hickory", "name": "Red Hickory", "botanical": "Carya ovalis", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 100, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 106, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "red-hills-azalea", "name": "Red Hills Azalea", "botanical": "Rhododendron colemanii", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 8, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 8, "shrub_years_to_90pct_height": 26, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 9 }, { "slug": "red-mulberry", "name": "Red Mulberry", "botanical": "Morus rubra", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 35, "height_max_ft": 50, "years_to_20_ft": 7, "years_to_12_in_trunk": 23, "years_to_24_in_trunk": 54, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "red-osier-dogwood", "name": "Red Osier Dogwood", "botanical": "Cornus sericea", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 1.2, "shrub_stem_years_per_inch_high": 32.7, "zone_min": 2, "zone_max": 7 }, { "slug": "red-spruce", "name": "Red Spruce", "botanical": "Picea rubens", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 75, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 70, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 6 }, { "slug": "redbay", "name": "Redbay", "botanical": "Persea borbonia", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "rhodora", "name": "Rhodora", "botanical": "Rhododendron canadense", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 6 }, { "slug": "river-birch", "name": "River Birch", "botanical": "Betula nigra", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "rock-elm", "name": "Rock Elm", "botanical": "Ulmus thomasii", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 70, "height_max_ft": 90, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 108, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 9 }, { "slug": "rosebay-rhododendron", "name": "Rosebay Rhododendron", "botanical": "Rhododendron maximum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 19, "shrub_stem_years_per_inch_low": 7.6, "shrub_stem_years_per_inch_high": 30.5, "zone_min": 3, "zone_max": 7 }, { "slug": "roughleaf-dogwood", "name": "Roughleaf Dogwood", "botanical": "Cornus drummondii", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 5, "zone_max": 8 }, { "slug": "roundleaf-dogwood", "name": "Roundleaf Dogwood", "botanical": "Cornus rugosa", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 2, "zone_max": 8 }, { "slug": "roundleaf-serviceberry", "name": "Roundleaf Serviceberry", "botanical": "Amelanchier sanguinea", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 23, "years_to_20_ft": 18, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 7, "shrub_years_to_90pct_height": 20, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 2, "zone_max": 8 }, { "slug": "runner-oak", "name": "Runner Oak", "botanical": "Quercus pumila", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "rusty-blackhaw", "name": "Rusty Blackhaw", "botanical": "Viburnum rufidulum", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 66, "years_to_24_in_trunk": 146, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "sand-cherry", "name": "Sand Cherry", "botanical": "Prunus pumila", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 8, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 3, "zone_max": 6 }, { "slug": "sand-hickory", "name": "Sand Hickory", "botanical": "Carya pallida", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 40, "height_max_ft": 100, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 106, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "sand-myrtle", "name": "Sand Myrtle", "botanical": "Kalmia buxifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 6, "zone_max": 8 }, { "slug": "sand-pine", "name": "Sand Pine", "botanical": "Pinus clausa", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 25, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "sand-post-oak", "name": "Sand Post Oak", "botanical": "Quercus margaretta", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "sandhill-oak", "name": "Sandhill Oak", "botanical": "Quercus inopina", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 5, "height_max_ft": 16, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 13, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 9 }, { "slug": "sarvis-holly", "name": "Sarvis Holly", "botanical": "Ilex amelanchier", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 30, "years_to_20_ft": 21, "years_to_12_in_trunk": 60, "years_to_24_in_trunk": 139, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 10 }, { "slug": "sassafras", "name": "Sassafras", "botanical": "Sassafras albidum", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 30, "height_max_ft": 60, "years_to_20_ft": 7, "years_to_12_in_trunk": 22, "years_to_24_in_trunk": 52, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "scentless-mock-orange", "name": "Scentless Mock Orange", "botanical": "Philadelphus inodorus", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 5, "zone_max": 10 }, { "slug": "schwerin-indigobush", "name": "Schwerin's Indigobush", "botanical": "Amorpha schwerinii", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 7, "zone_max": 8 }, { "slug": "scrub-hickory", "name": "Scrub Hickory", "botanical": "Carya floridana", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 8, "zone_max": 10 }, { "slug": "scrub-plum", "name": "Scrub Plum", "botanical": "Prunus geniculata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 9, "zone_max": 10 }, { "slug": "seaside-alder", "name": "Seaside Alder", "botanical": "Alnus maritima", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 9, "shrub_years_to_90pct_height": 27, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 9 }, { "slug": "september-elm", "name": "September Elm", "botanical": "Ulmus serotina", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 60, "height_max_ft": 70, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 50, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "shadblow-serviceberry", "name": "Shadblow Serviceberry", "botanical": "Amelanchier canadensis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "shagbark-hickory", "name": "Shagbark Hickory", "botanical": "Carya ovata", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 90, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 108, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "shellbark-hickory", "name": "Shellbark Hickory (Kingnut)", "botanical": "Carya laciniosa", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "shingle-oak", "name": "Shingle Oak", "botanical": "Quercus imbricaria", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 18, "years_to_12_in_trunk": 51, "years_to_24_in_trunk": 120, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "shining-indigobush", "name": "Shining Indigobush", "botanical": "Amorpha nitens", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 7, "zone_max": 9 }, { "slug": "shumard-oak", "name": "Shumard Oak", "botanical": "Quercus shumardii", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "silky-camellia", "name": "Silky Camellia", "botanical": "Stewartia malacodendron", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 10, "height_max_ft": 15, "years_to_20_ft": null, "years_to_12_in_trunk": 69, "years_to_24_in_trunk": 149, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "silky-dogwood", "name": "Silky Dogwood", "botanical": "Cornus amomum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 8 }, { "slug": "silverleaf-hydrangea", "name": "Silverleaf Hydrangea", "botanical": "Hydrangea radiata", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 3, "zone_max": 9 }, { "slug": "slimleaf-pawpaw", "name": "Slimleaf Pawpaw", "botanical": "Asimina longifolia", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "smooth-alder", "name": "Smooth Alder (Swamp Alder)", "botanical": "Alnus serrulata", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 4, "zone_max": 9 }, { "slug": "smooth-winterberry", "name": "Smooth Winterberry", "botanical": "Ilex laevigata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 5, "zone_max": 8 }, { "slug": "smooth-bark-st-johns-wort", "name": "Smooth-bark St. John's-wort", "botanical": "Hypericum lissophloeus", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 10 }, { "slug": "softleaf-arrowwood", "name": "Softleaf Arrowwood", "botanical": "Viburnum molle", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 7 }, { "slug": "sourwood", "name": "Sourwood", "botanical": "Oxydendrum arboreum", "form": "medium-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 25, "height_max_ft": 50, "years_to_20_ft": 19, "years_to_12_in_trunk": 52, "years_to_24_in_trunk": 126, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "southern-bush-honeysuckle", "name": "Southern Bush-honeysuckle", "botanical": "Diervilla sessilifolia", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 8 }, { "slug": "southern-catalpa", "name": "Southern Catalpa", "botanical": "Catalpa bignonioides", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 30, "height_max_ft": 60, "years_to_20_ft": 7, "years_to_12_in_trunk": 22, "years_to_24_in_trunk": 52, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "southern-crabapple", "name": "Southern Crabapple", "botanical": "Malus angustifolia", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "southern-magnolia", "name": "Southern Magnolia", "botanical": "Magnolia grandiflora", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "southern-pawpaw", "name": "Southern Pawpaw", "botanical": "Asimina pygmea", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "southern-red-oak", "name": "Southern Red Oak", "botanical": "Quercus falcata", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "southern-shagbark-hickory", "name": "Southern Shagbark Hickory", "botanical": "Carya carolinae-septentrionalis", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 70, "height_max_ft": 125, "years_to_20_ft": 18, "years_to_12_in_trunk": 47, "years_to_24_in_trunk": 102, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 8 }, { "slug": "spicebush", "name": "Spicebush", "botanical": "Lindera benzoin", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 9 }, { "slug": "spruce-pine", "name": "Spruce Pine", "botanical": "Pinus glabra", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 80, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 48, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "squashberry", "name": "Squashberry", "botanical": "Viburnum edule", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 2, "height_max_ft": 7, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 2, "zone_max": 8 }, { "slug": "staggerbush", "name": "Staggerbush", "botanical": "Lyonia mariana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 2, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "staghorn-sumac", "name": "Staghorn Sumac", "botanical": "Rhus typhina", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 15, "height_max_ft": 25, "years_to_20_ft": 9, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 4, "shrub_years_to_90pct_height": 12, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 3, "zone_max": 8 }, { "slug": "strawberry-bush", "name": "Strawberry Bush", "botanical": "Euonymus americanus", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 9 }, { "slug": "streambank-mock-orange", "name": "Streambank Mock Orange", "botanical": "Philadelphus hirsutus", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 11, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 10 }, { "slug": "striped-maple", "name": "Striped Maple", "botanical": "Acer pensylvanicum", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 15, "height_max_ft": 35, "years_to_20_ft": 20, "years_to_12_in_trunk": 57, "years_to_24_in_trunk": 136, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 7 }, { "slug": "sugarberry", "name": "Sugarberry", "botanical": "Celtis laevigata", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 48, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "swamp-azalea", "name": "Swamp Azalea", "botanical": "Rhododendron viscosum", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 3, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 8, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 4, "zone_max": 9 }, { "slug": "swamp-chestnut-oak", "name": "Swamp Chestnut Oak, select line", "botanical": "Quercus michauxii", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 90, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 67, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "swamp-cottonwood", "name": "Swamp Cottonwood", "botanical": "Populus heterophylla", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 70, "height_max_ft": 90, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 67, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "swamp-doghobble", "name": "Swamp Doghobble", "botanical": "Eubotrys racemosa", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "swamp-privet", "name": "Swamp Privet", "botanical": "Forestiera acuminata", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "swamp-tupelo", "name": "Swamp Tupelo", "botanical": "Nyssa biflora", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 80, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 69, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "swamp-white-oak", "name": "Swamp White Oak", "botanical": "Quercus bicolor", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "sweet-azalea", "name": "Sweet Azalea", "botanical": "Rhododendron arborescens", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 8, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 4, "zone_max": 8 }, { "slug": "sweet-birch", "name": "Sweet Birch (Black Birch)", "botanical": "Betula lenta", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 70, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 71, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "sweet-pepperbush", "name": "Sweet Pepperbush (Summersweet)", "botanical": "Clethra alnifolia", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 4, "height_max_ft": 8, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 9 }, { "slug": "sweetbay-magnolia", "name": "Sweetbay Magnolia", "botanical": "Magnolia virginiana", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 35, "years_to_20_ft": 13, "years_to_12_in_trunk": 35, "years_to_24_in_trunk": 84, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "sweetleaf", "name": "Sweetleaf", "botanical": "Symplocos tinctoria", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "sweetshrub", "name": "Sweetshrub", "botanical": "Calycanthus floridus", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 4, "zone_max": 9 }, { "slug": "table-mountain-pine", "name": "Table Mountain Pine", "botanical": "Pinus pungens", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 20, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 7 }, { "slug": "tamarack", "name": "Tamarack", "botanical": "Larix laricina", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 50, "height_max_ft": 75, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 49, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 2, "zone_max": 6 }, { "slug": "texas-red-oak", "name": "Texas Red Oak", "botanical": "Quercus buckleyi", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "three-flower-hawthorn", "name": "Three-flower Hawthorn", "botanical": "Crataegus triflora", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 7, "zone_max": 8 }, { "slug": "titi", "name": "Titi", "botanical": "Cyrilla racemiflora", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 8, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 9, "shrub_years_to_90pct_height": 27, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 10 }, { "slug": "tough-bully", "name": "Tough Bully", "botanical": "Sideroxylon tenax", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 8, "zone_max": 10 }, { "slug": "toughleaf-dogwood", "name": "Toughleaf Dogwood", "botanical": "Cornus asperifolia", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 6, "height_max_ft": 13, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 6, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 7, "zone_max": 9 }, { "slug": "turkey-oak", "name": "Turkey Oak", "botanical": "Quercus laevis", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "two-wing-silverbell", "name": "Two-wing Silverbell", "botanical": "Halesia diptera", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "umbrella-magnolia", "name": "Umbrella Magnolia", "botanical": "Magnolia tripetala", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 15, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "upland-swamp-privet", "name": "Upland Swamp Privet", "botanical": "Forestiera ligustrina", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 10, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 7, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 9 }, { "slug": "virginia-spiraea", "name": "Virginia Spiraea", "botanical": "Spiraea virginiana", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 13, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 2, "shrub_years_to_90pct_height": 6, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 6, "zone_max": 7 }, { "slug": "virginia-sweetspire", "name": "Virginia Sweetspire", "botanical": "Itea virginica", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 5, "zone_max": 9 }, { "slug": "walter-viburnum", "name": "Walter's Viburnum", "botanical": "Viburnum obovatum", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 7, "zone_max": 10 }, { "slug": "washington-hawthorn", "name": "Washington Hawthorn", "botanical": "Crataegus phaenopyrum", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 }, { "slug": "water-elm", "name": "Water Elm", "botanical": "Planera aquatica", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 30, "height_max_ft": 40, "years_to_20_ft": 19, "years_to_12_in_trunk": 55, "years_to_24_in_trunk": 133, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "water-hickory", "name": "Water Hickory", "botanical": "Carya aquatica", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 80, "height_max_ft": 100, "years_to_20_ft": 18, "years_to_12_in_trunk": 48, "years_to_24_in_trunk": 106, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 10 }, { "slug": "water-locust", "name": "Water Locust", "botanical": "Gleditsia aquatica", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 12, "years_to_12_in_trunk": 32, "years_to_24_in_trunk": 74, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "water-tupelo", "name": "Water Tupelo", "botanical": "Nyssa aquatica", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 60, "height_max_ft": 100, "years_to_20_ft": 12, "years_to_12_in_trunk": 30, "years_to_24_in_trunk": 66, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 10 }, { "slug": "weeping-hawthorn", "name": "Weeping Hawthorn", "botanical": "Crataegus lacrimata", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 26, "years_to_20_ft": 16, "years_to_12_in_trunk": 38, "years_to_24_in_trunk": 88, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 8, "zone_max": 9 }, { "slug": "western-mayhaw", "name": "Western Mayhaw", "botanical": "Crataegus opaca", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 20, "height_max_ft": 30, "years_to_20_ft": 14, "years_to_12_in_trunk": 37, "years_to_24_in_trunk": 86, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "white-fringetree", "name": "White Fringetree", "botanical": "Chionanthus virginicus", "form": "small-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 12, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": 66, "years_to_24_in_trunk": 146, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 9 }, { "slug": "white-oak", "name": "White Oak", "botanical": "Quercus alba", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 50, "height_max_ft": 80, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 112, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 9 }, { "slug": "white-wicky", "name": "White Wicky", "botanical": "Kalmia cuneata", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 2, "height_max_ft": 5, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 4, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 8 }, { "slug": "wild-black-currant", "name": "Wild Black Currant", "botanical": "Ribes americanum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 7 }, { "slug": "wild-hydrangea", "name": "Wild Hydrangea", "botanical": "Hydrangea arborescens", "form": "shrub", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 3, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 3, "shrub_stem_years_per_inch_high": 6, "zone_min": 3, "zone_max": 9 }, { "slug": "willow-oak", "name": "Willow Oak", "botanical": "Quercus phellos", "form": "large-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 75, "years_to_20_ft": 7, "years_to_12_in_trunk": 21, "years_to_24_in_trunk": 49, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 5, "zone_max": 9 }, { "slug": "winged-elm", "name": "Winged Elm", "botanical": "Ulmus alata", "form": "medium-tree", "growth_class": "fast", "feet_a_year": 2.75, "height_min_ft": 40, "height_max_ft": 60, "years_to_20_ft": 7, "years_to_12_in_trunk": 22, "years_to_24_in_trunk": 52, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 6, "zone_max": 9 }, { "slug": "winterberry", "name": "Winterberry Holly", "botanical": "Ilex verticillata", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 6, "height_max_ft": 12, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 3, "shrub_years_to_90pct_height": 9, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 9 }, { "slug": "witch-hazel", "name": "Witch Hazel", "botanical": "Hamamelis virginiana", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 12, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 3, "zone_max": 8 }, { "slug": "woolly-beach-heather", "name": "Woolly Beach Heather", "botanical": "Hudsonia tomentosa", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 2, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 2, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 2, "zone_max": 8 }, { "slug": "woolly-huckleberry", "name": "Woolly Huckleberry", "botanical": "Gaylussacia mosieri", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 1, "height_max_ft": 3, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 1, "shrub_years_to_90pct_height": 3, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "woolly-pawpaw", "name": "Woolly Pawpaw", "botanical": "Asimina incana", "form": "shrub", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 4, "height_max_ft": 6, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 0, "shrub_years_to_90pct_height": 5, "shrub_stem_years_per_inch_low": 10, "shrub_stem_years_per_inch_high": 30, "zone_min": 8, "zone_max": 9 }, { "slug": "yaupon", "name": "Yaupon", "botanical": "Ilex vomitoria", "form": "small-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 25, "years_to_20_ft": 16, "years_to_12_in_trunk": 39, "years_to_24_in_trunk": 89, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 7, "zone_max": 9 }, { "slug": "yellow-anise", "name": "Yellow Anise", "botanical": "Illicium parviflorum", "form": "shrub", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 10, "height_max_ft": 20, "years_to_20_ft": null, "years_to_12_in_trunk": null, "years_to_24_in_trunk": null, "shrub_years_to_half_height": 6, "shrub_years_to_90pct_height": 17, "shrub_stem_years_per_inch_low": 5, "shrub_stem_years_per_inch_high": 15, "zone_min": 6, "zone_max": 10 }, { "slug": "yellow-birch", "name": "Yellow Birch", "botanical": "Betula alleghaniensis", "form": "large-tree", "growth_class": "slow", "feet_a_year": 1, "height_min_ft": 60, "height_max_ft": 75, "years_to_20_ft": 18, "years_to_12_in_trunk": 49, "years_to_24_in_trunk": 113, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 7 }, { "slug": "yellow-buckeye", "name": "Yellow Buckeye", "botanical": "Aesculus flava", "form": "large-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 50, "height_max_ft": 75, "years_to_20_ft": 12, "years_to_12_in_trunk": 31, "years_to_24_in_trunk": 70, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 3, "zone_max": 8 }, { "slug": "yellowwood", "name": "Yellowwood", "botanical": "Cladrastis kentukea", "form": "medium-tree", "growth_class": "medium", "feet_a_year": 1.5, "height_min_ft": 30, "height_max_ft": 50, "years_to_20_ft": 13, "years_to_12_in_trunk": 33, "years_to_24_in_trunk": 78, "shrub_years_to_half_height": null, "shrub_years_to_90pct_height": null, "shrub_stem_years_per_inch_low": null, "shrub_stem_years_per_inch_high": null, "zone_min": 4, "zone_max": 8 } ] }