Tree care by season: winter, spring, summer and fall jobs

When to prune, what ice, deer and road salt do in winter, how often to water in a drought, and which November jobs protect a young trunk from the cold.

An established planting of native trees and shrubs needs only a few jobs a year, each in its season. Late winter is for pruning, while the branches are bare. Spring brings planting, the first checks of trunks and guards, and fresh mulch. Summer asks only for a deep soak in a long dry spell. Fall is the second planting season, and the time to leave the leaves, guard young trunks against bucks and voles, and water evergreens before the ground freezes.

A young oak seen from above in fall, its leaves yellowing at the edges, inside a ring of green wire hoops — A planted dwarf chinquapin oak inside wire hoops on October 27, 2026. Deer browse the twigs of small trees, and bucks rub their antlers on young trunks in late summer and fall. Photo: Blue Whale Trees

A tree in its first two or three years needs more water and watching, set out in a care calendar of its own from the day it arrives to its fifth spring. For older plantings the year runs like this, each row a section below:

Season	Pruning	Planting	Water	Checks and guards
Winter	Most trees and summer-blooming shrubs	Into spring where winters are mild	Evergreens on unfrozen ground after dry weeks	Ice left to melt; bark checked for gnawing
Spring	Spring bloomers after they flower	Dormant stock before the buds swell	Only in a long dry spell	Wraps and rub guards off; mulch topped up
Summer	Dead wood; maples and birches in full leaf	Potted plants, with regular water	A deep soak every one to two weeks in a drought	Rub guards up by mid-August
Fall	Dead and broken wood only	Until about six weeks before the ground freezes	Deeply after a dry fall, until the ground freezes	Leaves left; grass mown; white wraps on thin bark

Winter: pruning, storms and hungry animals

Pruning while the branches are bare

Most trees are best pruned while dormant, from late winter until just before the buds break. The structure shows with the leaves down, and the insects and fungi that colonize fresh wounds are mostly inactive. A cut made a few weeks before growth starts begins to close early in the season, and pruning at the branch collar shows where to make it. Dead, broken or hazardous limbs can come off at any time.

Three groups keep dates of their own:

Maples, birches and walnuts bleed sap when cut as the weather warms, which looks alarming and does no harm. Cut them in the coldest weeks or in early summer.
Oaks where oak wilt occurs are cut only while dormant, since beetles carry the fungus to fresh wounds from spring into summer.
Spring bloomers such as spicebush set their flower buds the summer before, so a winter cut takes the bloom. Prune them right after they flower.

Shrubs that bloom in summer on the year’s new shoots are cut in late winter, and so are old shrubs renewed by cutting a few of the oldest stems each year. Pruning and renewing native shrubs sorts the kinds we grow by when each is cut.

Ice, snow and broken limbs

Leave ice on the branches until it melts, since knocking it off breaks twigs and limbs that were only bent. Bent wood often straightens once the load is gone. Brush loose snow off a shrub or small evergreen with a gentle upward sweep, and let frozen snow melt.

Bare tree branches and twigs each sheathed in clear ice and hung with icicles against a pale gray winter sky — Ice on every twig of a tree in Buffalo, New York, on February 23, 2023. Ice is left to melt, since trying to knock it off breaks branches and twigs. Photo: Andre Carrotflower, CC BY-SA 4.0 (source)

Keep clear of any limb touching a wire, and leave big hanging limbs to an arborist. A broken limb is cut back to the branch collar once the weather allows. Whether to take a tree down can wait for the growing season unless it threatens people or property, as ice and snow on trees explains.

Voles, rabbits and deer

Hungry animals turn to bark and twigs in winter, so walk the planting after deep snow and again at the thaw. Look low first, since voles gnaw bark at the soil line under snow and deep mulch, leaving tooth scrapes about an eighth of an inch wide. A tree girdled that way often leafs out in spring and then collapses. Rabbits clip twigs cleanly at an angle, and deer leave torn tips. Protecting young trees from animals gives the guards that stop each.

Salt and winter burn

Spray from salted roads carries up to 1,000 feet and dries conifer needles and the buds of broadleaf trees, worst in late winter and early spring. It browns the side facing the road. Shovel snow away from plants, and never pile salty snow on a bed. By a road, plant what takes salt, such as eastern red cedar and the others that native street trees names.

Brown needles on the sunny, windy side of an evergreen are more often winter burn. Either way, wait for new growth in spring before cutting, since an evergreen whose buds lived grows out of the damage.

Spring: leaf-out, planting and the first checks

A late tree is not a dead one

An oak still bare in mid-April, when the maples are green, is normal, as when oaks leaf out explains. Before giving up on a late tree, try the scratch test: green under the bark of a small twig means it is alive. A tree that has not leafed out is not judged dead before June 1. A late frost that kills the first leaves is rarely the end, since oaks push a second set within a few weeks.

A young scarlet oak in spring, its new leaves just opened, soft and tinged bronze, with deeply cut, bristle-tipped lobes — A young scarlet oak's new leaves, soft and tinged bronze, on May 24, 2024. Swelling buds and opening leaves close the pruning season that bare branches open. Photo: Blue Whale Trees

Planting in spring

Dormant stock goes in once the frost is out of the ground and before the buds swell, often weeks before the last frost. In the North, spring is the surer season for bare-root trees. Trees with fleshy roots that heal slowly in cold ground, such as pawpaw and sweetbay magnolia, go in as growth starts. Bare-root trees on arrival covers the first weeks.

Wraps off, guards checked, mulch topped up

Take white trunk wraps off once the nights stay above freezing, before the trunk thickens under them. Take down rub guards, untie anything bound against snow, and make sure no tie is cutting into bark. Once the soil has warmed, rake the old mulch loose and add just enough to bring it back to 2 or 3 inches. Keep it a hand’s width off young trunks, as mulch around a tree shows.

Summer: water in a drought, and the signs to read

Water deeply, and only in a long dry spell

An established tree gets by on rain in most summers and needs help only in a long dry spell:

“During periods of consistent rainfall, a well-sited and well-established tree or shrub will need little additional water. But during long periods without rainfall, established trees and shrubs can suffer or die without timely irrigation.” (University of Minnesota Extension, Watering established trees and shrubs)

Then soak the whole ground under the crown and a few feet past the branch tips, never only at the trunk, until the soil is moist 6 to 12 inches down. Soak again once the top 6 inches have dried, every one to two weeks in a drought, since a light daily sprinkle harms the roots. Drought and an established tree gives the gallons, and the watering calculator works them out from the trunk’s width.

What the leaves are telling you

The signs of a dry summer, and of the things that look like one:

Wilting that recovers overnight is the first sign of thirst. Scorched brown leaf edges in July and August come next, worst on the side facing wind, sun or pavement.
Scattered older leaves that yellow and drop in midsummer are the normal summer shed, which dry weather speeds.
Yellow between green veins on the newest leaves is chlorosis, from soil above pH 7, and yellow leaves in summer sorts it from the rest.
Tan to brown blotches along the veins after a cool, wet spring point to anthracnose, which is seldom serious. Spots, powder and speckles on tree leaves tells the spots that matter.

Late summer cuts, caterpillars and rub guards

Keep summer pruning to dead wood and to the bleeders in full leaf, and put the saw away from August on, since a late cut wakes growth that may not harden before winter. Most caterpillars, from tent caterpillars in spring to fall webworm, can be left on a healthy tree, but bagworms on an evergreen cannot, as caterpillars on a tree explains. By mid-August, put a rub guard or cage around each trunk 1 to 4 inches thick, since bucks shred the bark rubbing off their velvet from then into December.

White-tailed buck pressing his antlers and forehead against a tree trunk in tall dry grass, a second deer behind — A buck rubbing his antlers on a trunk on November 4, 2008. Bucks rub off their velvet each fall, so guards against rubbing stay on young trunks from August through December. Photo: USFWS Mountain Prairie, Public domain (source)

Fall: planting, leaves, seed and guards

The second planting season

Fall planting runs from leaf drop until about six weeks before the ground usually freezes, because new roots need warm soil. Roots keep growing until the soil cools to about 40 to 45 degrees. In the South they grow through the mild fall and winter, so fall is the best season there and the window runs on through winter. When to plant a tree sets out which trees do better in spring.

Leave the leaves

Let the fallen leaves lie under trees and shrubs, out to the drip line where you can:

“Fallen leaves are a tremendous resource for the gardener, not something to be discarded or hauled off.” (Penn State Extension, Leaves Are Treasure, Not Trash)

A lawn in autumn sun, its left half mowed with the leaves shredded into the grass, its right half under whole leaves — Fallen leaves on a lawn in Ewing Township, New Jersey, on November 2, 2023, half of them shredded by a mulching mower. Shredded leaves break down much faster than whole ones. Photo: Famartin, CC BY-SA 4.0 (source)

They return a large share of the minerals the tree gathered all summer, and they shelter insects through the winter. On the lawn, mow them into the grass, or rake them onto the beds 2 to 4 inches deep, a hand’s width clear of each trunk. A layer that looks deep in November settles to half by May, as leaf litter, not wood chips explains.

Seed in a good year

Acorns, nuts and much other tree seed ripen in fall. A white-oak-group acorn is sown the week it falls, while red-oak-group acorns and most nuts need a cold, damp winter first. Float acorns the day they are gathered, since sound ones sink, and gather in a mast year if you can. Planting acorns, nuts and seed covers the sowing, and the seed sowing planner gives each species its dates.

Guards, wraps and the last water

Every tree Blue Whale Trees sells leaves the nursery small enough to need guards for its first few years, and fall is the time to check them. Mow the grass short within 2 feet of young trees, where voles shelter, and look for ties cutting into bark and tubes packed with mouse nests. In November, wrap thin-barked young trunks in white against sunscald for their first two or three winters. After a dry fall, water deeply until the ground freezes, evergreens above all.

A young swamp white oak on a lawn inside a wide cage of welded wire, its leaves still green in fall — A young swamp white oak in a welded-wire cage on October 21, 2026. Grass within 2 feet of a young tree is cut short in late fall, so mice and voles find no cover there. Photo: Blue Whale Trees

Setting the year by your trees and your frost dates

Every job above moves with the weather and the zone, so the trees set its date better than a calendar can. The Morton Arboretum’s own garden calendar runs by season and by the stages of the plants rather than by month:

“To garden as successfully as possible, we must look at the weather, as well as stages of development in plants, and not calendar dates.” (The Morton Arboretum, Garden Calendar)

Bare branches open the pruning season, and swelling buds close it. For planting, the planting-window tool turns the frost dates for your ZIP code into fall and spring windows. Its last spring frost falls about May 9 in zone 5 in New York and about March 25 in zone 8 in Georgia. In Georgia’s zone 8, a potted tree can go in from early September to early May. The bloom and fruit calendar gives the months each plant we grow flowers and fruits, which times a spring bloomer’s cut and the gathering of its seed.

Common questions

When is the best time to prune trees and shrubs?

Late winter, while they are dormant and before the buds break, for most trees and for shrubs that bloom in summer. Prune spring bloomers right after they flower, and cut dead or broken wood at any time.

Should I water my trees in winter?

Not an established tree that has dropped its leaves. Water evergreens deeply after a dry fall, before the ground freezes. In a dry winter, give them water once or twice a month on a day above 40 degrees, on unfrozen ground.

What tree care should I do in spring?

Take off trunk wraps and rub guards, check that no tie is cutting into bark, and top the mulch up to 2 or 3 inches. Plant dormant stock before the buds swell, and give a late tree until June 1.

How often should I water an established tree in summer?

Only in a long dry spell, and then deeply, until the soil under the crown and past the branch tips is moist 6 to 12 inches down. Soak again when the top 6 inches have dried, usually every one to two weeks.

What should I do for my trees in November?

Plant while your fall window is open, and leave the fallen leaves under the trees. Mow the grass short around young trunks, check the guards, wrap thin young bark in white, and water evergreens before the ground freezes after a dry fall.

Garden Calendar: The Morton Arboretum, with its page How and When to Prune Trees: the quotation on the weather and the stages of plants over calendar dates, the calendar’s seasons, swelling buds as the sign of new growth, animal damage checked and snow brushed off in winter, de-icer and salty snow kept off plants, ties removed and salt damage checked in spring, and water through fall until the soil freezes; the dormant season as the time to prune most trees, a cut weeks before growth starts, the bleeders, oaks cut while dormant and no pruning in late summer.
Watering established trees and shrubs: University of Minnesota Extension, with its pages Protecting trees and shrubs in winter and How to manage deer damage on trees and other plants: the quotation on rain and long dry spells, and temporary wilting as the first sign of thirst; rodents and deer at bark in winter, grass cut short within 2 feet in late fall, white wraps on in fall and off in spring, ties removed in spring and a heavy watering before freeze-up after a dry fall; and bark shredded by antler rubbing in the fall rut, with guards in place from August through December.
Watering Trees and Shrubs: University of Maryland Extension, with its pages Storm Damage and Voles: large established trees left unwatered unless a drought is severe, deep watering out to the drip line, and evergreens watered before the ground freezes; ice left to melt, and branches bent under snow and ice that return to normal; and voles girdling lower trunks in winter.
Leaves Are Treasure, Not Trash: Penn State Extension, with its pages Minimize Deicer Damage with Salt Tolerant Plants and Helping Trees Recover After Storms: the quotation on fallen leaves, leaves shredded into the lawn by a mower or spread 2 to 4 inches deep around trees and shrubs, shredded leaves decaying faster, and the leaf layer as winter shelter; salt spray carried up to 1,000 feet and drying conifer needles and the buds of broadleaf trees in late winter and early spring, and eastern red cedar’s tolerance of it; and wires and a qualified arborist after a storm.
Planting Trees Correctly: Clemson Cooperative Extension, Home and Garden Information Center: roots that keep growing through the Southeast’s warmer fall and winter months, and fall as the best season to plant there.
11. Woody Ornamentals: NC State Extension, Extension Gardener Handbook: roots that grow most of the year and stop when the soil is around 40 to 45 degrees.

Caring for native trees and shrubs season by season