Wrapping trees and shrubs for winter: what to wrap, what never to wrap

Trees & shrubs · 9 min read

Winter wrapping is not one job — it is three different protections that happen to use similar materials. A trunk wrap guards a young tree against sunscald. A burlap screen on stakes shields an evergreen against drying wind and road salt. A hardware-cloth cylinder stops rodents chewing bark under the snow. Wrapping everything the same way, in the same material, protects some plants, does nothing for others, and actively harms a few. The skill is matching the protection to the threat, and knowing which plants should be left completely alone.

Threat one: sunscald on young, thin-barked trunks

Sunscald happens on the south and southwest side of a trunk. Winter sun warms that side of the bark during the day, enough to wake dormant tissue into activity, and the rapid temperature drop after sunset then kills the reactivated cells. The result is a sunken, discoloured, sometimes cracked vertical patch of dead bark. Young trees are the most susceptible because their bark is smooth and thin; mountain ash, apple, and maple are named repeatedly as vulnerable, along with dark-barked cherry, and thin-barked species generally — linden, ginkgo, crabapple, and redbud among them.

The counterintuitive point is that trunk wrap does not keep a tree warm. Its purpose is to keep the bark cool and shaded: a light-coloured wrap reflects sun, evens out the day-to-night temperature swing, and stops the tissue from waking up in the first place. That is why dark wraps are the wrong choice — they absorb sun and increase the heat on the bark surface, recreating the problem under a layer of fabric. Wrap from the soil line up to the lowest branch, spiralling upward with each layer overlapping the one below, and secure it with twine at the top.

Threat two: winter burn on exposed evergreens

Evergreens face a different injury. Winter burn is the drying and browning of foliage that loses water through its needles or leaves faster than frozen roots can replace it. All evergreens can suffer it, but yews, arborvitae, and hemlocks are particularly susceptible, and the worst sites are southern or western exposures hit by both sun and harsh wind, plus roadside plantings exposed to de-icing salt spray.

For these plants the right protection is usually a screen, not a cocoon. Stretch burlap around stakes set around the plant — protecting the south, west, and windward sides — so the fabric stands off the foliage rather than resting on it, and leave the top open because the plant still needs light in winter. A screen breaks wind, shades the foliage, and blocks salt spray without pressing wet fabric against the needles all season. Watering evergreens thoroughly right up until the ground freezes is the companion step: a plant entering winter well hydrated has reserves to lose. Newly planted evergreens are the priority — a well-established evergreen that has grown in place for years is built for a normal winter and generally needs no wrapping at all.

Threat three: rodents under the snow

The third threat works invisibly. When snow cover hides them from predators and other food runs short, rodents chew bark at the base of young trees, sometimes girdling the trunk — and a fully girdled young tree usually dies. Neither burlap nor paper wrap is a reliable barrier to teeth. The specific protection is a cylinder of hardware cloth or wire mesh around the base, set a couple of inches into the soil so animals cannot push underneath it, and standing high enough to stay above the expected snowline, since chewing happens at snow level, not ground level. Mulch helps roots through winter, but keep it a few inches away from the trunk itself so it does not shelter burrowing rodents against the bark.

The decision framework: wrap, screen, guard, or leave alone

1. Is it a young or newly planted deciduous tree with smooth, thin bark? Wrap the trunk with light-coloured wrap, soil line to lowest branch, for its first few winters.
2. Is it an evergreen on an exposed south, west, windward, or roadside site — especially one planted this year or last? Build a staked burlap screen on the exposed sides, top open, and water deeply before the ground freezes.
3. Is there rodent pressure — field edges, deep snow, bark damage in past winters? Add a hardware-cloth cylinder at the base regardless of what else is done. A trunk wrap alone is not rodent protection.
4. Is it mature, thick-barked, established, or sheltered? Leave it alone. Trees with thick, furrowed bark — bur oak is the standard example — have natural insulation and do not need wrapping, and established evergreens in sheltered sites winter without help.

The wrapping procedure, step by step

1. Wait for late fall. Apply protection in late fall — trunk wrap guidance commonly points to October, or after the first hard frost and before a deep freeze. Wrapping in warm early-fall weather traps heat and moisture for no benefit.
2. Water first. Give trees and shrubs a deep watering before the ground freezes, especially evergreens and anything planted this season.
3. Wrap trunks bottom-up. Start at the soil line, slightly anchoring the end, and spiral upward overlapping each turn, finishing at the lowest branch. Secure with twine — never wire or anything that can constrict the trunk as it grows.
4. Screen evergreens on stakes. Drive stakes around the exposed sides, stretch burlap across them so it does not touch the foliage, and leave the top open.
5. Set rodent guards. Form the hardware-cloth cylinder wider than the trunk, bury its base a couple of inches, and check it stands above the likely snowline.
6. Mulch the root zone, not the trunk. A layer of mulch a few inches deep over the roots, held a few inches back from the bark, buffers soil temperature and holds moisture.

What never to wrap — and the removal rule

• Never leave any wrap on year-round. Every protection comes off in early spring — trunk wrap guidance commonly says remove it in April, or once the last hard freeze has passed. Left on, wrap traps moisture against bark, shelters insects, can promote fungal problems, and restricts trunk growth. This seasonal removal is not optional housekeeping; it is half the technique.
• Never use dark-coloured wrap on a trunk. It absorbs winter sun and heats the bark it was meant to protect.
• Never wrap a mature, thick-barked tree. Its bark is already the insulation. Wrapping adds moisture and insect shelter with no benefit.
• Never seal an evergreen tightly in fabric or plastic. Plastic guards breathe poorly and trap moisture and heat against bark and foliage. An evergreen needs a standoff screen with airflow and an open top, not a sealed bag.
• Never keep wrapping a tree indefinitely. Trunk wrap is a first-years measure — generally the first one to three years after planting. Once bark has thickened, the protection should stop.

What success looks like

Success is visible at both ends of the season. In fall, the finished yard shows light-coloured trunk wraps ending neatly at the lowest branches, burlap screens standing off evergreen foliage with open tops, and mesh cylinders sitting proud of where the snowline will be — while mature and sheltered plants stand unwrapped. In spring, success is what is absent: no sunken, cracked patch on the southwest side of young trunks, no ring of chewed bark at the base, no broad browning on the windward side of new evergreens — and every wrap, screen, and tie removed and stored before new growth begins, not discovered still strapped to a swelling trunk in May.

FAQ

Can white paint substitute for trunk wrap? Extension guidance lists white latex paint as an alternative that also reflects sun and reduces rapid temperature change on the bark. It suits owners who reliably forget spring removal — but it is a coating, not rodent protection, so pair it with a mesh guard where rodents are a problem.

Does a shrub screen need all four sides? Usually not. Cover the sides most exposed to wind and sun and leave the top open; a sheltered side can stay open too, which keeps airflow moving through the plant.

What if a wrap was left on all summer? Remove it as soon as it is noticed, inspect the bark underneath for moisture damage, insects, or constriction marks, and do not reapply until late fall. One forgotten season is a lesson, not a death sentence for most trees — but the habit of leaving wraps on is exactly how fungal and insect problems get established.