Evergreens are supposed to stay green all year, right? So why do some of them suddenly turn brown when winter arrives?
If you’ve ever noticed brown needles on your arborvitae, discolored boxwoods, or crispy-looking rhododendron leaves, you might have wondered whether your plants were sick or dying.
Here’s some good news: Brown foliage doesn’t always mean your evergreen has a disease, and it doesn’t necessarily mean the entire plant is dead!
One common cause of winter browning is a condition called winter burn. Understanding why it happens and how to prevent it can help keep your landscape looking beautiful throughout the colder months.
Here in the Berkshires, where freezing temperatures, snow, and cold winter winds are part of the season, protecting vulnerable evergreens is especially important.
What Is Winter Burn?
Despite its name, winter burn has nothing to do with heat or fire!
Winter burn occurs when evergreen foliage loses more moisture than the plant’s roots can replace.
Unlike deciduous trees that shed their leaves in fall, evergreens retain their needles or leaves throughout winter.
Even during cold weather, these plants continue losing small amounts of moisture through their foliage.
The problem begins when the ground freezes.
Frozen soil limits the roots’ ability to absorb water. Add bright winter sunshine, drying winds, and fluctuating temperatures, and evergreen foliage may lose moisture faster than it can be replenished.
The result can be brown, dried-out leaves and needles.
In Cheshire and surrounding Berkshire communities, long periods of freezing weather can make this a particular concern for exposed plants.
Which Evergreens Are Most Vulnerable?
Although nearly any evergreen can experience winter injury, certain plants deserve extra attention.
Commonly affected evergreens include:
- Arborvitae: Particularly newly planted shrubs and plants growing in exposed, windy locations.
- Boxwoods: May develop bronze, yellow, or brown foliage after harsh winter weather.
- Rhododendrons: Broad leaves may curl, discolor, or develop brown edges.
- Hollies: Some broadleaf varieties can experience winter leaf scorch.
- Yews: May develop brown needles following exposure to winter sun and wind.
- Pines and Spruces: Can develop brown needle tips or areas of winter injury during severe weather.
Newly planted evergreens are especially vulnerable because their root systems haven’t had enough time to become fully established.
Plants growing near roads, driveways, or other exposed areas may also experience additional stress.
How to Recognize Winter Burn
Winter burn doesn’t always appear immediately.
Sometimes evergreens look perfectly healthy through December and January, only to develop brown foliage in late winter or early spring.
Common signs include:
- Brown, reddish-brown, or bleached needles and leaves.
- Browning that begins near leaf or needle tips.
- Damage concentrated on the south or southwest side of the plant.
- More severe discoloration on branches exposed to sunlight and wind.
- Healthier foliage on branches protected by snow or nearby structures.
One helpful clue: Winter burn often affects the outer, exposed portions of a plant more severely than protected interior foliage.
However, browning can also result from drought, poor drainage, salt exposure, insects, or disease.
The location, pattern, and timing of the damage can help determine what is happening.
Don’t Confuse Winter Burn With Natural Needle Drop
Here’s something that surprises many gardeners!
Evergreens don’t keep every needle forever.
Many needled evergreens naturally shed older foliage as part of their regular growth cycle.
Pines, arborvitae, and other conifers may develop yellow or brown needles toward their interiors, particularly during fall.
These older needles eventually drop while healthy newer growth remains on the outside.
If browning occurs primarily on older interior foliage and the outer branches remain green, it may be normal seasonal shedding rather than winter damage.
This is one reason it’s important to identify the pattern before assuming something is wrong.
Five Ways to Protect Evergreens From Winter Burn
The best protection against winter injury begins before the coldest weather arrives.
1. Water Before the Ground Freezes
Proper fall watering is one of the most effective ways to help reduce winter drying.
Evergreens need adequate soil moisture heading into winter, especially after an unusually dry autumn.
Check the soil several inches below the surface. If it feels dry, water slowly and thoroughly so moisture reaches the root zone.
Continue monitoring moisture until the ground freezes, but avoid overwatering or leaving roots in saturated soil.
Gardening tip: Pay extra attention to evergreens planted within the last few years. Their root systems may still be developing.
Remember that watering in November cannot completely reverse the effects of a long, dry growing season. Consistent care throughout the year is important.
2. Add a Protective Layer of Mulch
Mulch isn’t just for making garden beds look neat!
A 2 to 3-inch layer of organic mulch can help conserve moisture and moderate soil temperatures around plant roots.
Shredded bark, wood chips, and other suitable organic materials are good choices.
Spread mulch over the root zone, but keep it several inches away from trunks and stems.
Avoid creating mulch volcanoes, which trap moisture against bark and may contribute to decay.
3. Protect Plants From Winter Wind and Sun
Some vulnerable evergreens benefit from additional protection during harsh weather.
Burlap screens can help reduce exposure to drying winds and intense winter sunshine.
Install stakes around exposed plants and attach burlap to create a protective windbreak.
Leave some space between the screen and foliage rather than tightly wrapping the plant.
This can be particularly helpful for young arborvitae, boxwoods, and broadleaf evergreens growing in exposed locations.
In the Berkshires, where winter winds can be strong and temperatures remain cold for extended periods, a simple screen may help reduce damage.
4. Avoid Late-Season Fertilizing and Heavy Pruning
Fall may seem like a good time to give evergreens one final boost, but heavy applications of nitrogen fertilizer can encourage tender new growth when applied too early in the fall.
That growth may not have enough time to harden off before freezing temperatures arrive.
Unnecessary late-season pruning can also expose foliage or create additional stress.
Save major pruning and routine fertilizing for the appropriate season, based on the plant’s needs and soil conditions.
5. Choose the Right Plant for the Right Location
One of the best ways to prevent winter injury is to select evergreens suited to your landscape.
Consider:
- Exposure to winter sunshine.
- Prevailing winds.
- Soil drainage and moisture.
- Mature plant size.
- Local winter hardiness.
- Exposure to road salt and deicing products.
Some evergreens thrive in protected locations but struggle when planted in open areas exposed to winter wind.
The right plant in the right place can make all the difference!
Don’t Forget About Road Salt!
There’s another winter problem that can cause evergreen browning, especially in snowy regions like western Massachusetts.
Salt used to melt ice on roads, sidewalks, and driveways can damage nearby plants.
Salt spray may injure needles and leaves, while salty runoff can affect roots and soil conditions.
If evergreens near a driveway or roadway develop brown foliage, salt exposure may be contributing to the problem.
To reduce the risk:
- Avoid piling salty snow around shrubs.
- Use deicing materials carefully and according to directions.
- Keep sensitive plants away from areas receiving heavy salt exposure.
- Consider protective screens where road spray is a recurring problem.
Can Evergreens Recover From Winter Burn?
If your evergreens develop brown foliage, don’t rush to grab the pruning shears!
Brown needles and leaves generally won’t turn green again, but the plant may still be alive and capable of producing healthy new growth.
Wait until spring, when new growth begins to emerge, before deciding which branches are truly dead.
Living branches may produce fresh foliage that improves the plant’s appearance.
However, completely dead branches will not recover, and some evergreens cannot regrow from old, bare wood.
Keep damaged plants properly watered during dry weather and avoid unnecessary stress while they recover.
If browning continues to spread or the cause isn’t clear, have the plant evaluated before making major pruning or replacement decisions.
Frequently Asked Questions About Winter Burn
Why are my arborvitae turning brown in winter?
Arborvitae may turn brown because of winter drying, drought, salt exposure, pests, or other stresses. Winter burn occurs when foliage loses more moisture than the roots can replace. However, browning of older interior foliage in fall may simply be natural needle shedding.
Does brown foliage mean my evergreen is dead?
Not necessarily! Brown foliage indicates damaged leaf tissue, but branches and buds may still be alive. Wait for spring growth before deciding whether large portions of the plant need to be removed.
Can winter burn be prevented?
You can reduce the risk through consistent watering, proper mulching, protection from drying winds, and choosing plants suited to your climate. These steps help, although severe winter conditions may still cause some damage.
Should I wrap my arborvitae in burlap?
A burlap screen can help protect exposed evergreens from winter wind and sunlight. Position it around the plant rather than tightly against the foliage, leaving room for air circulation.
When should I prune winter-damaged evergreens?
Wait until spring growth makes it easier to identify living and dead branches. Pruning too early may remove healthy tissue or encourage unnecessary stress.
Why do my rhododendron leaves curl during winter?
Rhododendron leaves naturally curl and droop during cold weather as part of their response to freezing conditions. This alone does not mean the plant is damaged. Leaves that remain brown, dry, or wilted after temperatures warm may indicate winter injury.
Keep Your Evergreens Beautiful All Year Long!
Winter can be tough on trees and shrubs, especially here in the Berkshires, where freezing temperatures and cold winds are part of the season.
But a little preparation can go a long way!
By keeping evergreens properly watered, mulching their roots, shielding vulnerable plants, and choosing varieties suited to local growing conditions, you can help reduce winter damage and encourage healthier growth next spring.
Have questions about browning evergreens or preparing your landscape for winter?
Stop by Whitney’s Farm Market & Garden Center in Cheshire, MA!
Our friendly team is happy to help you explore evergreen varieties, find seasonal gardening supplies, and discover ways to keep your Berkshire landscape healthy throughout the changing seasons.
Because evergreens should bring beautiful color to your garden, even when everything else is taking a winter break!
