# American Hornbeam (Carpinus caroliniana)

> Smooth, sinewy gray trunks, orange-red fall color and complete comfort in shade and damp soil.

Also called musclewood, ironwood, blue beech. Category: Uncommon Yard Trees. Grown from seed by Blue Whale Trees. Web version: https://bluewhaletrees.com/plants/american-hornbeam/

![American hornbeam (Carpinus caroliniana) trunk, smooth and gray with the sinewy ridges that give it the name musclewood](https://bluewhaletrees.com/img/plants/american-hornbeam-2-h1610-800.jpg)
*Photo: Blue Whale Trees*

## Facts

- Type: Small tree
- Mature height: 20 to 35 ft
- USDA hardiness zones: 3 to 9
- Grows wild in: Stream banks, floodplain forests and the forest understory
- Native range: 33 states and [the District of Columbia](https://bluewhaletrees.com/tools/native/index.html.md?state=DC), north to [Minnesota](https://bluewhaletrees.com/tools/native/index.html.md?state=MN), south to [Florida](https://bluewhaletrees.com/tools/native/index.html.md?state=FL) and west to [Texas](https://bluewhaletrees.com/tools/native/index.html.md?state=TX) ([Alabama](https://bluewhaletrees.com/tools/native/index.html.md?state=AL), [Arkansas](https://bluewhaletrees.com/tools/native/index.html.md?state=AR), [Connecticut](https://bluewhaletrees.com/tools/native/index.html.md?state=CT), [Delaware](https://bluewhaletrees.com/tools/native/index.html.md?state=DE), [Florida](https://bluewhaletrees.com/tools/native/index.html.md?state=FL), [Georgia](https://bluewhaletrees.com/tools/native/index.html.md?state=GA), [Illinois](https://bluewhaletrees.com/tools/native/index.html.md?state=IL), [Indiana](https://bluewhaletrees.com/tools/native/index.html.md?state=IN), [Iowa](https://bluewhaletrees.com/tools/native/index.html.md?state=IA), [Kentucky](https://bluewhaletrees.com/tools/native/index.html.md?state=KY), [Louisiana](https://bluewhaletrees.com/tools/native/index.html.md?state=LA), [Maine](https://bluewhaletrees.com/tools/native/index.html.md?state=ME), [Maryland](https://bluewhaletrees.com/tools/native/index.html.md?state=MD), [Massachusetts](https://bluewhaletrees.com/tools/native/index.html.md?state=MA), [Michigan](https://bluewhaletrees.com/tools/native/index.html.md?state=MI), [Minnesota](https://bluewhaletrees.com/tools/native/index.html.md?state=MN), [Mississippi](https://bluewhaletrees.com/tools/native/index.html.md?state=MS), [Missouri](https://bluewhaletrees.com/tools/native/index.html.md?state=MO), [New Hampshire](https://bluewhaletrees.com/tools/native/index.html.md?state=NH), [New Jersey](https://bluewhaletrees.com/tools/native/index.html.md?state=NJ), [New York](https://bluewhaletrees.com/tools/native/index.html.md?state=NY), [North Carolina](https://bluewhaletrees.com/tools/native/index.html.md?state=NC), [Ohio](https://bluewhaletrees.com/tools/native/index.html.md?state=OH), [Oklahoma](https://bluewhaletrees.com/tools/native/index.html.md?state=OK), [Pennsylvania](https://bluewhaletrees.com/tools/native/index.html.md?state=PA), [Rhode Island](https://bluewhaletrees.com/tools/native/index.html.md?state=RI), [South Carolina](https://bluewhaletrees.com/tools/native/index.html.md?state=SC), [Tennessee](https://bluewhaletrees.com/tools/native/index.html.md?state=TN), [Texas](https://bluewhaletrees.com/tools/native/index.html.md?state=TX), [Vermont](https://bluewhaletrees.com/tools/native/index.html.md?state=VT), [Virginia](https://bluewhaletrees.com/tools/native/index.html.md?state=VA), [West Virginia](https://bluewhaletrees.com/tools/native/index.html.md?state=WV), [Wisconsin](https://bluewhaletrees.com/tools/native/index.html.md?state=WI) and [the District of Columbia](https://bluewhaletrees.com/tools/native/index.html.md?state=DC))
- Sun: Part, Shade, Full
- Soil moisture: Average, Wet
- Growth rate: Slow
- Flowers: April to May
- Fruit: Nutlets, October
- First crop: About 15 years
- Mature spread: 35 ft
- Traits: Fall color, Wildlife value, Tolerates shade, Tolerates wet soil, Winter interest, Street tree
- Sold as: Saplings, Seed

Heights and zones are typical ranges for the species in cultivation; local conditions and seed source shift them.

## Availability

Saplings ship [bare-root](https://bluewhaletrees.com/articles/planting-bare-root-trees-on-arrival/index.html.md), [usually 12 to 18 inches tall](https://bluewhaletrees.com/articles/small-sapling-or-big-transplant/index.html.md), in the dormant season, and their [height and age](https://bluewhaletrees.com/articles/reading-a-nursery-listing/index.html.md) are stated with the price, once available. Live plants ship February to May. Not priced yet: leave an email on the web page for one email when it is priced, with a code for 10% off the plants in that order, not shipping or tax, or write to captain@bluewhaletrees.com.

In bundles: Shade Understory Pack.

## Notes

Hornbeam is the understory tree of stream bottoms, with fluted bark that looks like flexed muscle. It grows slowly into a broad, low crown, tolerates flooding and deep shade, and its hard wood earned the name ironwood. Perfect under tall oaks or along a wet property line. Pruned to one leader, it makes a street tree for a narrow tree lawn, and its sinewy trunk shows all winter. Well suited to a clipped hedge or a small yard where fall color matters more than size.

## Size, growth and what to expect

American hornbeam adds 8 to 10 feet of height in ten years, about a foot a year. Our growth estimator models it at the same slow rate in its youth on an average site. Trees top out at 15 to 20 feet in Canada and 25 to 35 feet in the South, with a crown about as wide as the tree is tall. Trees are short-lived, typically about 100 years and seldom past 150.

The first seed comes at about 15 years, with a large crop every 3 to 5 years. Catkins open in April and May, and the ribbed nutlets ripen in October, each hanging under a three-lobed leafy bract about an inch long. Songbirds, grouse, turkeys and squirrels take the seed, buds and catkins. The bark on older trees is smooth slate gray and fluted like a flexed arm, which is where the name musclewood comes from.

It grows wild across most of the eastern United States, from southern Ontario and Quebec to eastern Texas and the Ozarks.

## How to grow American Hornbeam

American hornbeam thrives in shade. It takes full sun as well if the soil stays moist, and it is untroubled by wet ground or spring flooding. Plant it on a streambank, in a low corner or beneath oaks. At full size it needs 15 to 20 feet from a building and from other trees.

Set out dormant bare-root saplings in early spring, which suits hornbeam better than fall planting. Dig a broad, shallow hole, position the root flare at the surface, and refill with unamended soil. Water thoroughly, then mulch a ring three inches deep that does not touch the trunk. Pick the seed while the nutlets are still greenish and sow it outdoors that fall, a quarter inch deep under mulch. Seedlings come up the next spring. Seed gathered brown and dry needs two to four months of cold, damp storage, and some of it waits until the second spring.

Musclewood is slow to settle in, so water it weekly through the first summer and in dry weeks for two more years. Deer and rabbits both damage young hornbeams, so use a wire guard until the trunk is two inches thick.

Male and female catkins appear together on the same tree and the wind carries the pollen, so one tree sets seed alone. Expect little top growth for the first few years while the roots establish. Fall color is orange to red and strongest in sun. Prune in summer if you must, since late winter cuts can bleed sap.

## Sources

- [USDA Forest Service, Silvics of North America: American hornbeam](https://research.fs.usda.gov/silvics/american-hornbeam)
- [USDA Forest Service, Woody Plant Seed Manual: Carpinus chapter](https://www.fs.usda.gov/nsl/Wpsm/Carpinus.pdf)
- [The Morton Arboretum: American hornbeam](https://mortonarb.org/plant-and-protect/trees-and-plants/american-hornbeam/)
- [USDA Fire Effects Information System: Carpinus caroliniana](https://www.fs.usda.gov/database/feis/plants/tree/carcar/all.html)
- [USDA NRCS Plant Guide: American hornbeam, Carpinus caroliniana](https://plants.sc.egov.usda.gov/DocumentLibrary/plantguide/pdf/pg_caca18.pdf)
- [Lady Bird Johnson Wildflower Center: Carpinus caroliniana](https://www.wildflower.org/plants/result.php?id_plant=CACA18)
- [Virginia Tech Dendrology: hornbeam, Carpinus caroliniana](https://dendro.cnre.vt.edu/dendrology/syllabus/factsheet.cfm?ID=17)
- [Flora of North America, vol. 3: Carpinus caroliniana](http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233500311)
- [Go Botany (Native Plant Trust): Carpinus caroliniana, American hornbeam](https://gobotany.nativeplanttrust.org/species/carpinus/caroliniana/)
- [Trees and Shrubs Online: Carpinus caroliniana](https://www.treesandshrubsonline.org/articles/carpinus/carpinus-caroliniana/)
- [NC State Extension Gardener Plant Toolbox: Carpinus caroliniana](https://plants.ces.ncsu.edu/plants/carpinus-caroliniana/)
- [USDA NRCS PLANTS Database: Carpinus caroliniana](https://plants.usda.gov/plant-profile/CACA18)
- [USDA Forest Service, Northern Research Station, Climate Change Tree Atlas (retired March 2026](https://web.archive.org/web/20250312100639/https://www.fs.usda.gov/nrs/atlas/tree/resources/lhdr/lhdr_391.html)

## Read before planting

- [Ten planting mistakes that quietly kill trees](https://bluewhaletrees.com/articles/ten-planting-mistakes/index.html.md)
- [Transplanting young trees: timing, water and protection](https://bluewhaletrees.com/articles/transplanting-young-trees/index.html.md)
- [Protecting young trees from voles, rabbits, deer and squirrels](https://bluewhaletrees.com/articles/protecting-trees-from-animals/index.html.md)
- [What to plant under a big tree: native shrubs for shade, and how to plant without hurting the tree](https://bluewhaletrees.com/articles/what-to-plant-under-a-big-tree/index.html.md)
- [Winter identification: telling native trees apart by bark, buds and twigs](https://bluewhaletrees.com/articles/winter-tree-identification/index.html.md)
- [Multistem or single stem? Sometimes the trunk is hiding the answer](https://bluewhaletrees.com/articles/multistem-or-single-stem/index.html.md)

## Related

- Plants that share its sun and soil: [Two-wing Silverbell](https://bluewhaletrees.com/plants/two-wing-silverbell/index.html.md), [Pawpaw](https://bluewhaletrees.com/plants/pawpaw/index.html.md), [Sweetleaf](https://bluewhaletrees.com/plants/sweetleaf/index.html.md) and [Red Buckeye](https://bluewhaletrees.com/plants/red-buckeye/index.html.md)
- Trees to plant it under: [Sugarberry](https://bluewhaletrees.com/plants/sugarberry/index.html.md), [Swamp Laurel Oak](https://bluewhaletrees.com/plants/swamp-laurel-oak/index.html.md) and [Spruce Pine](https://bluewhaletrees.com/plants/spruce-pine/index.html.md)
- Same size, similar character: [Downy Hawthorn](https://bluewhaletrees.com/plants/downy-hawthorn/index.html.md), [Sweetbay Magnolia](https://bluewhaletrees.com/plants/sweetbay-magnolia/index.html.md), [Washington Hawthorn](https://bluewhaletrees.com/plants/washington-hawthorn/index.html.md) and [Buckthorn Bully](https://bluewhaletrees.com/plants/buckthorn-bully/index.html.md)
- [Planting-site check](https://bluewhaletrees.com/tools/site-check/index.html.md): for a thrive, struggle or fail verdict on American Hornbeam (Musclewood), add ?species=american-hornbeam with zone (2 to 10), sun (full, part, shade) and moisture (dry, average, wet) to that address; for example, the verdict for zone 3, part sun and average soil as Markdown is at https://bluewhaletrees.com/tools/site-check/index.html.md?species=american-hornbeam&zone=3&sun=part&moisture=average
- [Companion species for American Hornbeam (Musclewood)](https://bluewhaletrees.com/tools/companions/index.html.md?species=american-hornbeam): the natives that share its ground and the plants that pair with it in a yard.
- [Transplant planner](https://bluewhaletrees.com/tools/transplant/index.html.md?species=american-hornbeam): whether American Hornbeam (Musclewood) can be moved and what the move takes, the root ball, its weight, who can move it and the months, as Markdown at that address (add caliper= or height=, month= 1 to 12 and soil= sandy, loam or clay)
- [Tree growth estimator](https://bluewhaletrees.com/tools/growth/index.html.md): how the height and trunk projections are made; the estimate for American Hornbeam (Musclewood) as Markdown is at https://bluewhaletrees.com/tools/growth/index.html.md?species=american-hornbeam (add height=, years= and site= poor, average or good)
- [Seed sowing planner](https://bluewhaletrees.com/tools/sowing/index.html.md): how American Hornbeam (Musclewood) is sown, in the chart for every species (treatment, cold days, depth, timing); the dated plan for it as Markdown is at https://bluewhaletrees.com/tools/sowing/index.html.md?species=american-hornbeam (add state= and zone= for your own frost dates, method=fridge for the refrigerator route)
- [Pollination planner](https://bluewhaletrees.com/tools/pollination/index.html.md): what American Hornbeam (Musclewood) needs for a crop and how many to plant, in the table for every species; the verdict for 1 of them as Markdown is at https://bluewhaletrees.com/tools/pollination/index.html.md?plants=american-hornbeam:1
- [Planting-window tool](https://bluewhaletrees.com/tools/planting-window/index.html.md): when to plant American Hornbeam (Musclewood) where you live, as a fall and a spring window from the local frost dates; the windows as Markdown are at https://bluewhaletrees.com/tools/planting-window/index.html.md?species=american-hornbeam&state=MO&zone=6 with your own state and zone in place of those
- [Planting-distance tool](https://bluewhaletrees.com/tools/distance/index.html.md): how far American Hornbeam (Musclewood) goes from a house, a septic field, a walk, wires, a property line and the next tree; the distances as Markdown are at https://bluewhaletrees.com/tools/distance/index.html.md?species=american-hornbeam&near=house,septic,pavement,wires,boundary,tree
- [Bloom and fruit calendar](https://bluewhaletrees.com/tools/calendar/index.html.md): the months American Hornbeam (Musclewood) flowers and fruits, in the grid for every species; its own row and the gaps of a planting with it as Markdown at https://bluewhaletrees.com/tools/calendar/index.html.md?plants=american-hornbeam