Arborvitae Care Turning Brown

Why Is My Arborvitae Turning Brown? A Gardener’s Guide To Saving Your Hedges

If you’ve walked out into the yard and noticed your arborvitae turning brown, you’re not alone. I’ve had that sinking feeling myself — you plant a neat row of green soldiers, and suddenly they look tired, patchy, and stressed. The good news? Browning arborvitae can often be diagnosed and helped, especially if you act early and understand what’s going on. In this article, I’ll walk you through the main reasons arborvitae turn brown, what’s normal and what’s not, and how to bring them back to good health. Think of this as a practical troubleshooting guide from someone who’s lost a few arborvitae… and saved a lot more.

First Things First: Is Brown On Arborvitae Always Bad?

Not all browning is a sign of doom. Some of it is completely natural. Understanding the difference is the first step.

Normal Seasonal Browning (Fall Needle Drop)

Arborvitae are evergreens, but that doesn’t mean every needle lives forever. Like all evergreens, they shed older foliage. A normal, harmless browning:

• Happens mostly in fall (sometimes late summer)
• Is mainly on the inside of the plant, not the tips
• Shows as older, inner foliage turning yellow, then brown, and falling
• Does not affect the very ends of the branches, which stay green

I remember the first time I saw this in my own hedge. I was sure some disease was taking over. But it turned out to be the plant’s way of refreshing itself. If the browning is mostly hidden inside and your arborvitae still looks green from the outside, it’s usually just natural shedding.

When Browning Is A Warning Sign

Problem browning usually looks different. You should be concerned if:

• The tips or whole branches are turning brown
• Browning is patchy on the outside, not just on the inner foliage
• The browning is spreading quickly week to week
• It appears at odd times (mid-spring, early summer) instead of fall
• Parts of the plant are dried, brittle, or dead

When you see this kind of browning, it’s time to play plant detective. Water, roots, soil, pests, and even wind can all be suspects. Let’s go through them one by one.

Water Stress: The Most Common Reason Arborvitae Turn Brown

In my experience, most arborvitae problems start with water — either too much or too little. The tricky part is that both can look surprisingly similar.

Underwatering And Drought Stress

Arborvitae like consistent moisture, especially in the first 2–3 years after planting. They’re not desert plants, and they don’t enjoy long, dry spells. Signs of underwatering:

• Tips and sides of the plant turn light green, then yellow, then brown
• Soil feels dry several inches down
• Newly planted arborvitae look droopy or thin
• Brown foliage is crisp and brittle to the touch

How to help:

• Water deeply, not just a splash on top. Soak the root zone so the water penetrates 8–12 inches deep.
• Water slowly. I like to use a soaker hose snaked around the base for an hour or so, especially in summer.
• Mulch with 2–3 inches of shredded bark around the base, keeping it a few inches away from the trunk.
• During hot, dry weather, young arborvitae usually need a deep watering at least once a week.

A quick tip from my own yard: if you stick your finger in the soil and it’s dry down to your second knuckle, your arborvitae is thirsty.

Overwatering And Poor Drainage

Arborvitae love moisture, but they hate soggy feet. Heavy clay soils, low spots in the yard, or irrigation that runs too long can waterlog their roots. Overwatering symptoms:

• Random branches turning yellow or brown
• Soil that feels wet or sticky, even days after rain
• Moss or algae on the soil surface
• Slow decline, especially in heavier soils

How to fix overwatering:

• Check your irrigation schedule. Arborvitae don’t want daily light watering; they prefer deep, less-frequent watering.
• Improve drainage if possible. Gently break up compacted soil around the drip line without damaging roots.
• Make sure the soil can dry slightly between waterings.
• If standing water collects around the base after rain, consider adding a French drain or regrading.

I’ve moved arborvitae out of constantly wet areas because no matter how carefully I watered, the soil just stayed too heavy. Once they were in a better spot, the browning stopped.

Winter Burn: The Silent Killer Of Arborvitae Color

One of the most heartbreaking causes of browning is winter burn. The damage shows up in late winter or early spring, right when you’re hoping for fresh growth.

How Winter Burn Happens

Winter burn is a combination of:

• Dry, cold winds pulling moisture out of the foliage
• Frozen ground so roots can’t take up enough water
• Bright winter sun heating up the foliage on cold days

The plant loses more moisture through its needles than it can replace, and the foliage dries and turns brown. This often happens on the side facing the wind or strong winter sun. Typical symptoms:

• Brown or bronze foliage, especially on the windward or south-facing side
• Damage appearing in late winter or early spring
• Top and outer tips affected more than the inside

Protecting Arborvitae From Winter Burn

Over the years, I’ve started treating arborvitae almost like roses when it comes to winter prep. A little effort in fall makes a huge difference. Ways to prevent winter burn:

• Water deeply in late fall before the ground freezes. Well-hydrated roots handle winter stress better.
• Apply 2–3 inches of mulch around the base to protect roots and help retain moisture.
• Use burlap screens or wraps on exposed hedges, especially in windy or open locations.
• Avoid heavy pruning late in the season; tender new growth is more vulnerable.

With winter burn, patience is important. Wait until late spring to see what recovers. Sometimes what looks dead in March starts to green up by May.

Root Problems: When Arborvitae Brown From The Bottom Up

Healthy roots are the hidden engine behind those green walls of arborvitae. Disturb the roots, and the top will tell you all about it by turning brown.

Transplant Stress And Planting Issues

Newly planted arborvitae are especially touchy. I’ve seen them turn brown just from being planted a bit too deep or having their roots left in a tight pot-bound circle. Watch for:

• Browning in the first year or two after planting
• Poor new growth and a generally “stalled” look
• Plants that rock easily in the soil (not well-anchored)

Best practices when planting:

• Plant the root flare (where the trunk widens) level with, or slightly above, the surrounding soil.
• Loosen circling roots from the pot and spread them into the planting hole.
• Backfill with the native soil (not pure compost), and water thoroughly to remove air pockets.
• Do not pile mulch against the trunk like a volcano; keep it a few inches away.

Mechanical Damage To Roots

Sometimes we damage arborvitae roots without realizing it: installing edging, digging a trench, or running heavy equipment too close. Signs of root damage:

• Sudden browning on one side of the plant
• Decline after nearby construction, digging, or grading
• Leaning or instability in the plant

In these cases, the best you can often do is:

• Water carefully (not too much, not too little)
• Mulch to moderate soil temperature and moisture
• Limit further disturbance around the root zone

Salt, Chemicals, And Environmental Stress

Not all damage is from water and weather. Sometimes the environment around your arborvitae is harsher than it looks.

Road Salt And De-Icing Products

If your arborvitae line a driveway or sidewalk that gets salted in winter, they might be suffering from salt burn. I’ve seen beautiful hedges ruined over a few harsh winters. Symptoms of salt damage:

• Brown tips and edges, especially on the side closer to the road or driveway
• Stunted growth and thinning foliage
• Worse browning after winters with heavy salt use

How to protect against salt:

• Use sand or more plant-friendly de-icing products near your arborvitae.
• In late winter or early spring, water the area well to help flush salt from the soil.
• Create a physical barrier (like a low board or snow fence) between the hedge and the salted area.

Herbicide Drift And Chemical Exposure

Broadleaf weed killers, cleaning products, or overspray from lawn treatments can also stress arborvitae. While they’re not as sensitive as some plants, repeated exposure can cause browning. If you suspect chemicals:

• Look for patterns of browning on the side facing the source.
• Check recent lawn treatments, weed spraying, or cleaning in nearby areas.
• Rinse foliage gently with water if exposure was recent.

Pests And Diseases That Turn Arborvitae Brown

Compared to many shrubs, arborvitae are fairly tough. But they’re not invincible. Certain insects and diseases can cause browning, especially if the plant is already stressed.

Spider Mites: Tiny Pests, Big Damage

Spider mites love dry, dusty conditions and can quietly suck the life out of arborvitae foliage. Signs of spider mites:

• Foliage that looks dull, stippled, or “dirty” before it turns brown
• Fine webbing deep inside the branches (not always obvious)
• When you tap a branch over white paper, tiny moving specks appear

Control methods I’ve used:

• Spraying the foliage with a strong blast of water to knock mites off
• Using insecticidal soap or horticultural oil, making sure to coat the undersides and interior foliage
• Encouraging natural predators by avoiding broad-spectrum insecticides on the hedge

Bagworms And Other Chewing Insects

In some regions, bagworms can be a major issue for arborvitae. These little pests build “bags” or cases that hang from the branches and can strip the foliage. What to look for:

• Brown, cone-shaped “bags” hanging from twigs (often mistaken for seed cones)
• Localized browning and defoliation near the bags
• Bags that move slightly when the caterpillar inside is feeding

What I do when I see them:

• Hand-pick and destroy the bags (drop them in soapy water). This is very effective if you catch them early.
• For larger infestations, use a targeted insecticide labeled for bagworms, following directions carefully.

Fungal And Root Diseases

Fungal diseases on arborvitae usually show up as:

• Scattered dead branch tips or patches
• Brown foliage that may have tiny black dots or fruiting bodies
• Slow, uneven decline

Management usually involves:

• Improving air flow by not planting hedges too tightly
• Watering at the base, not overhead, so foliage stays drier
• Removing and disposing of badly infected branches (don’t compost)
• In serious cases, applying a fungicide recommended for arborvitae diseases

Root rot diseases are more likely in poorly drained soils and often go hand-in-hand with overwatering. Once they’re advanced, they’re hard to reverse, which is why good drainage at planting is so important.

Can Brown Arborvitae Turn Green Again?

This is the real question everyone asks me when they bring photos of their browning hedge. The honest answer is: it depends.

When Browning Is Reversible

You have a good chance of recovery when:

• The browning is recent and not too extensive
• The branches are still flexible, not crispy and dead
• The cause (water, salt, wind, etc.) is identified and corrected

In these cases, new green growth can fill in over a season or two. Arborvitae aren’t fast to heal, but they can surprise you with what they recover from if the roots are still healthy.

When Brown Foliage Will Not Grow Back

Dead is dead. If an arborvitae branch is completely brown, dry, and brittle, that specific foliage will not turn green again. Evergreen needles don’t “heal” the way some broadleaf plants can push out new leaves from the same node. What you can do is:

• Prune out dead tips and branches in late spring, after you see where new growth is emerging.
• Shape carefully; arborvitae do not regrow well from old bare wood, so avoid cutting back too far.
• Encourage overall plant health so fresh growth can cover some of the bare areas.

If a plant is more brown than green, especially from the top down, it may be time to replace it. I use a simple rule: if more than 50–60% of the foliage is dead, replacement is usually more satisfying than years of trying to coax it back.

My Step-By-Step Checklist When Arborvitae Start Turning Brown

When I get called to look at a troubled hedge, I always follow the same basic process. You can do this yourself:

Step One: Look At The Pattern Of Browning

Ask yourself:

• Is it inner foliage only (likely normal shedding)?
• Is it mostly on one side (wind, sun, salt, or root damage on that side)?
• Is it random branches all over (water, roots, disease, or insects)?

Step Two: Check The Soil And Roots

Gently dig a few inches down:

• Is the soil bone dry or soggy?
• Are there signs of construction, digging, or recent changes near the hedge?
• Is the mulch piled too high against the trunk?

Step Three: Inspect The Foliage Close-Up

Get your face right in there (I always end up smelling like arborvitae after this part):

• Do you see webbing or tiny moving dots (mites)?
• Any little “bags” or cocoons (bagworms)?
• Spots, lesions, or black dots that suggest fungi?

Step Four: Think About The Last Season

Consider:

• How was last winter? Windy? Dry? Extreme cold?
• Did you use a lot of de-icing salt?
• Any new weed killers, lawn treatments, or home projects near the hedge?

Step Five: Take Action And Then Be Patient

After you’ve identified the most likely cause:

• Adjust watering or drainage.
• Protect from wind or salt going forward.
• Treat pests or diseases if present.
• Prune only what is clearly dead, and wait to see what recovers in late spring.

Arborvitae are slower to show improvement than, say, a hydrangea or a rose. Give them a full season, sometimes two, before you judge your efforts.

Final Thoughts: Brown Arborvitae Don’t Have To Be A Disaster

Seeing your arborvitae turning brown is discouraging, but it’s also your plant’s way of telling you something isn’t quite right. Once you learn to “read” the pattern of browning — tips versus interior, one side versus all over, sudden versus gradual — you’re halfway to a solution. In my own garden, I’ve had hedges bounce back from winter burn, drought stress, and even a mild mite infestation. The key has always been the same:

• Diagnose the cause as accurately as you can
• Correct the underlying issue, not just the symptoms
• Give the plants time, water, and a bit of protection

If your arborvitae are browning right now, don’t give up on them just yet. Walk the hedge, get your hands in the soil, look closely at the foliage, and start with the basics: proper watering, good drainage, winter protection, and gentle care. With a little patience and attention, many “brown” arborvitae can return to being the lush green backdrop you originally planted them to be.