Evergreens may keep their color through winter, but they still lose water. When sunny or windy weather dries their foliage and frozen ground prevents roots from replacing that moisture, browning can follow. That damage is called winter burn, or winter desiccation. The best prevention is to keep plants adequately watered through fall, then protect exposed evergreens from drying winter sun and wind.
1. What winter burn is and why it happens
Evergreen leaves and needles continue to lose moisture during winter, especially during sunny, windy periods or warm spells. If the soil is frozen, roots cannot take up enough water to replace what the foliage loses. Dry soil in fall, recent planting, and prolonged cold can add to the stress.
Damage often becomes noticeable in late winter or early spring, as snow melts and temperatures rise. Browning may start at the tips or leaf edges and spread inward. The south- and west-facing sides are often hit hardest because they receive more sun, warmth, or drying wind.
Wisconsin Horticulture explains that even a winter thaw can prompt foliage to become active and lose water while roots remain locked in frozen soil. Winter burn is not always fatal, but badly damaged branches or whole plants may not recover.
2. Which evergreens are most at risk?
Broadleaf evergreens such as boxwood and holly can suffer, as can needle- and scale-leaved plants such as yew, spruce, juniper, and arborvitae. Newly planted evergreens are especially vulnerable because their roots may not yet have spread into surrounding soil. A plant installed this year deserves extra attention, as do arborvitae hedges exposed to prevailing wind or winter sun.
A species that is poorly matched to local winter conditions may also be more susceptible. Hardiness is only one part of the picture: exposure, soil, and the plant’s establishment all matter. Our guide to matching plants to your hardiness zone and local conditions offers a useful starting point when choosing future plantings.
3. Check for other causes before calling it winter burn
Browning is a clue, not a diagnosis. Look closely at where the damage is and what the plant looks like overall:
- Road salt: Browning may be concentrated on the side facing a treated road or walkway, often closer to the ground where salt spray reaches foliage.
- Rabbit or deer browsing: Look for clipped, ragged, or torn shoots rather than evenly scorched tips. Compare the pattern with signs of winter browsing and ways to protect plants.
- Bagworms or spider mites: Bagworm cases may remain attached to branches. Mite injury can appear as fine stippling or bronzing, sometimes with webbing. Persistent or spreading symptoms may need a closer inspection.
- Snow and ice: Broken, bent, or split branches point to physical damage, not desiccation. Nebraska Extension advises allowing ice to melt naturally rather than striking icy branches.
- Normal needle shedding: Some conifers shed older inner needles while newer growth remains green. If browning is limited to older foliage deep inside the plant, seasonal shedding may be the explanation.
When the cause is unclear or the plant keeps declining, consult a local Extension office or qualified arborist. Different problems can look similar, and the right response depends on the cause.
4. Water deeply through fall
The most important preventive step is helping evergreens enter winter with moist, not waterlogged, soil. Keep watering during dry fall weather until the ground freezes. Focus on the root zone from near the trunk out toward the dripline, where the branches end, rather than just wetting the base.
As a general guide, Wisconsin Horticulture recommends about 1 inch of water per week for established evergreens if rain is lacking. Newly transplanted conifers, those planted within roughly three years, may need about 2 inches per week. Sandy soil drains faster and may require more; let soil moisture and recent rainfall guide you rather than treating these amounts as a guarantee.
Apply water slowly so it can soak in. To check, gently dig a small test hole in the root area: the soil should feel moist several inches down, not dusty-dry or saturated. A hose placed near the root zone can make a thorough watering easier.
5. Water during winter thaws only when the ground is thawed
“Watering plants in winter” does not mean watering on a schedule regardless of conditions. If there is a prolonged dry spell and a mild winter thaw, check the soil first. Water only when the ground is unfrozen and the soil is dry. Choose a mild period when the water can soak into the ground, and disconnect and drain the hose afterward if freezing weather is expected.
K-State Research and Extension also advises watering before freeze-up and taking advantage of suitable thaws in dry winters. Never pour water onto frozen soil: it will not reach the roots. Avoid soaking already wet ground, too, since roots need air as well as moisture.
6. Mulch to steady soil moisture and temperature
A layer of organic mulch helps the soil hold moisture and reduces sharp temperature swings around roots. Spread a few inches over the root zone, but keep it pulled back from trunks and stems. Piled mulch can trap moisture against plant tissue and provide shelter for gnawing animals.
For practical pointers on mulch depth and keeping it clear of trunks, see our mulch guide. The goal is a protective blanket over the soil, not a mound against the plant.
7. Use sprays cautiously, and screen exposed plants
Anti-desiccant or anti-transpirant sprays are intended to slow moisture loss from foliage. They are not a guarantee, and extension guidance differs: Wisconsin Horticulture notes that these products may provide limited or unreliable protection, while Nebraska Extension emphasizes careful timing and following product labels.
If you consider a spray, apply it only after the plant is fully dormant and only when the label’s temperature and weather conditions can be met. Some products require temperatures above about 40°F to apply and dry properly. Check that the specific product is labeled for your plant: certain evergreens, including some arborvitae, junipers, and blue-needled conifers, may be injured or discolored by particular formulations.
For plants in windy or sunny spots, a physical screen is often a straightforward option. UMass Amherst recommends setting stakes outside the plant and attaching burlap to create a barrier on the exposed side. Keep the screen off the foliage and leave the top open; do not wrap the plant tightly. Remove the barrier in spring.
Evergreens growing in pots face a separate challenge: their roots are exposed to colder conditions than roots in the ground. For more on protecting container shrubs and perennials through winter, see our container guide.
8. Avoid late growth, and wait to prune
Skip late-season nitrogen fertilizer and avoid pruning in late summer or fall if it could stimulate tender new growth. Fresh growth may not harden off before winter. Don’t wrap evergreens in plastic, which can trap moisture and heat, and don’t rush to cut off brown tips in fall or winter. Some stems may still be alive.
In spring, wait until you can see which buds and branches are growing. Then prune clearly dead tips back to living tissue, using clean tools. Some evergreens can gradually fill in damaged areas; others may not regrow where branches are bare. Wisconsin Horticulture notes that recovery varies by species and severity, so give the plant time to show what is alive before making major cuts.
A healthy winter routine is steady rather than elaborate: water well through dry fall weather, check soil during mild thaws, mulch the root zone, and shield plants where wind and sun are harsh. No measure can prevent every injury, but understanding what causes winter burn gives your evergreens a better chance to greet spring with fresh growth.