Why Your Evergreens Turn Brown in Winter

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.

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 drop their leaves in fall, evergreens retain their needles or leaves throughout winter.

Even during colder weather, these plants continue losing small amounts of moisture.

The trouble begins when the ground freezes.

Frozen soil limits the roots’ ability to absorb water. Add bright winter sunshine, drying winds, and fluctuating temperatures, and the foliage may lose moisture faster than it can be replenished.

The result can be brown, dried-out needles and leaves.

Here in Plymouth and Carver, coastal winds and winter sunshine can make this an especially important concern for exposed evergreens.

Which Evergreens Are Most Vulnerable?

While nearly any evergreen can experience winter injury, certain varieties deserve extra attention.

Plants to keep an eye on include:

• Arborvitae: Particularly newly planted shrubs and those growing in exposed, windy locations.
• Boxwoods: May develop bronze, yellow, or brown foliage following harsh winter conditions.
• Rhododendrons: Broad leaves can develop dry, brown edges or damaged patches.
• Hollies: Broadleaf varieties may experience leaf scorch in exposed locations.
• Yews: Can develop brown needles after exposure to winter sun and wind.
• Pines and Spruces: May show brown needle tips or patches of winter injury following severe weather.

Newly planted evergreens are especially vulnerable because their root systems haven’t had enough time to become fully established.

How to Recognize Winter Burn

Winter burn doesn’t always show up immediately!

Sometimes evergreens look perfectly healthy through December and January, only to begin developing brown foliage in late winter or early spring.

Common signs include:

• Brown, reddish-brown, or bleached foliage.
• Browning that begins at leaf or needle tips.
• Damage concentrated on the south or southwest side of a plant.
• More severe discoloration on branches exposed to wind and sunlight.
• Healthier foliage where plants were protected by snow or nearby structures.

One helpful clue: Winter burn often affects exposed outer foliage more severely than protected inner branches.

However, browning can also be caused by drought, poor drainage, road salt, pests, or disease.

The location and pattern of damage, along with the timing of symptoms, can help identify the problem.

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 growth cycle.

Pines, arborvitae, and other conifers may develop yellow or brown needles toward the interior of the plant, especially during fall.

These older needles eventually drop while the newer outer growth remains healthy.

If the browning is mostly on older interior foliage and the plant’s outer branches are green, it may simply be normal seasonal shedding.

Five Ways to Protect Evergreens From Winter Burn

The best defense against winter damage begins before the coldest weather arrives.

1. Water Before the Ground Freezes

Proper fall watering is one of the most effective ways to reduce winter drying.

Evergreens need adequate soil moisture heading into winter, particularly during a dry autumn.

Check the soil several inches below the surface. If it feels dry, water slowly and deeply so moisture reaches the root zone.

Continue monitoring soil moisture until the ground freezes.

Avoid overwatering or leaving roots in saturated soil.

Gardening tip: Pay extra attention to evergreens planted during the last two or three years. Their root systems may still be developing.

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 soil moisture, moderate temperature fluctuations, and protect developing roots.

Shredded bark, wood chips, and other suitable organic mulches are good choices.

Spread mulch over the root zone, but keep it several inches away from trunks and stems.

Avoid creating mulch volcanoes, which can trap moisture against bark and contribute to plant health problems.

3. Shield Plants From Winter Wind and Sun

Some vulnerable evergreens benefit from additional protection when winter weather becomes harsh.

Burlap screens can help reduce exposure to drying winds and intense winter sunlight.

Place stakes around vulnerable plants and attach burlap to create a protective windbreak.

Leave some space between the screen and foliage to prevent rubbing and allow air circulation.

This approach can be especially helpful for young arborvitae, boxwoods, and broadleaf evergreens growing in exposed locations.

In coastal areas, protective screens can also help reduce exposure to wind-driven salt spray where that is a concern.

4. Avoid Late-Season Fertilizing and Heavy Pruning

Fall may seem like a good time to give evergreens one last boost, but heavy applications of nitrogen fertilizer can encourage tender new growth.

That growth may not have enough time to harden off before freezing weather arrives.

Likewise, unnecessary heavy pruning can expose foliage and create additional stress.

Save major pruning and routine fertilizing for the appropriate season, based on each plant’s needs.

5. Choose the Right Plant for the Right Location

One of the best ways to prevent future winter damage is to select evergreens suited to your landscape.

Consider:

• Exposure to winter sunlight.
• Prevailing winds and coastal conditions.
• Soil drainage and moisture.
• Mature plant size.
• Local cold hardiness.
• Exposure to road salt and deicing products.

Some evergreens thrive in protected locations but struggle when planted in open, windy areas.

A little planning can make a big difference in how your landscape handles winter!

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 determining which branches are truly dead.

Living branches may produce new 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.

Keep Your Evergreens Beautiful All Year Long!

Winter can be tough on trees and shrubs, but a little preparation can go a long way toward protecting your landscape.

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 protecting your landscape from winter weather?

Stop by Crystal Lake Garden Shop in Plymouth or Carver, MA!

Our friendly team is happy to help you explore evergreen varieties, find seasonal gardening supplies, and discover ways to keep your southeastern Massachusetts landscape healthy through the changing seasons.

Because evergreens should bring beautiful color to your garden, even when everything else is taking a winter break!