By Jagdish Reddy | 10+ Years Gardening Experience
Researched Using: University of Wisconsin Horticulture Division • University of Minnesota Extension
Updated: July 2026
Why is my arborvitae turning brown? If you’re asking yourself that question, the cause is usually one of three things: water stress, winter weather, or a pest you haven’t spotted yet. Some browning is completely normal for this popular privacy hedge and evergreen screen, while other signs mean your tree needs attention before the damage spreads.
In this guide, you’ll learn why your arborvitae is turning brown, discover the 17 most common reasons behind the problem, and find the exact steps to diagnose and fix each one before you lose your tree.
Quick Answer: Arborvitae usually turn brown from underwatering, overwatering, winter burn, spider mites, bagworms, root rot, transplant shock, or normal seasonal needle drop. Browning inside the plant near the trunk is usually harmless. Browning on the outer tips, on one side, or across whole branches usually needs attention. The location of the browning, whether it’s inside, outside, on the bottom, on top, or on one side, is usually the fastest way to identify the real cause.
Quick Diagnosis: Match Your Symptom to the Likely Cause
Before reading all 17 causes, use this table to narrow things down fast based on exactly where the browning shows up.
| What You See | Most Likely Cause | Section |
|---|---|---|
| Brown only inside, near trunk | Normal seasonal needle drop | Reason 1 |
| Brown tips, all around the plant | Drought, heat, or winter burn | Reasons 2, 4, 7 |
| Brown from the bottom up | Root rot or poor drainage | Reason 3 |
| Brown on one side only | Salt spray, wind, or reflected sun | Reasons 4, 5 |
| Turned brown suddenly, no clear reason | Root damage from nearby digging | Reason 6 |
| Brown after recent planting | Transplant shock | Reason 16 |
| Dying from the top down | Drought or root damage | Reasons 2, 6 |
| Random brown patches, fine webbing | Spider mites | Reason 10 |
Start Here: What Happened Before the Browning?
If you’re not sure which row above fits, work through this quick decision path.
- Did it happen after planting? → Likely transplant shock (Reason 16)
- Did it happen after winter? → Likely winter burn or salt damage (Reasons 4, 5)
- Did it happen during a heat wave? → Likely heat and drought stress (Reason 7)
- Is it only inside the plant, near the trunk? → Likely normal needle drop (Reason 1)
- Is it only on one side? → Likely salt, wind, or sun exposure (Reasons 4, 5)
- Did digging or construction happen nearby? → Likely root damage (Reason 6)
- None of the above? → Check for pests and disease (Reasons 10 to 12)
Is It Normal for an Arborvitae to Turn Brown, or Is It Dying?
Both are possible, and the difference comes down to location on the plant. Interior browning close to the trunk is usually normal. Browning at the tips, on new growth, or across an entire branch usually is not.
What a Healthy Arborvitae Should Normally Look Like
A healthy arborvitae has dense, uniform green foliage from the top of the canopy down to the base, with no bare gaps or thin patches. New growth at the branch tips should be a slightly lighter, fresher green than older interior foliage.
When Brown Needles Are a Normal Part of Growth
Arborvitae shed their oldest needles every year, just like deciduous trees drop leaves. These older needles sit deep inside the canopy, close to the trunk, and turn brown before falling off.
This shedding happens once a year, usually September through November. It looks alarming up close but never spreads to the outer, newer growth.
Warning Signs Your Arborvitae Needs Immediate Attention
Get concerned if you see any of these:
- Browning on the outer tips, not just inside the plant
- Whole branches turning brown at once, a sign of branch dieback
- Browning that shows up suddenly in summer or spring
- Webbing, small bags, or visible insects on the foliage
- Soft, mushy bark near the base of the trunk
Why Is My Arborvitae Turning Brown? The 17 Most Common Reasons
Arborvitae turn brown for one of these 17 reasons, ranging from harmless seasonal shedding to serious root and pest problems affecting the whole planting. Most are fixable once you catch them early.
1. Natural Seasonal Needle Drop Is Causing Brown Needles Inside the Arborvitae
Why Older Needles Naturally Turn Brown Every Year
Every evergreen replaces its oldest foliage on a cycle. For arborvitae, that cycle runs about two to three years per needle.
Old needles near the trunk turn brown, then tan, then drop. New growth at the tips stays green the entire time, which is the key giveaway.
How to Tell the Difference Between Normal Browning and a Problem
| Signal | Normal Drop | Actual Problem |
|---|---|---|
| Location | Inner needles near trunk | Outer tips or whole branches |
| Timing | Fall, once a year | Any season, sudden onset |
| Spread | Stays contained inside | Moves outward over weeks |
If your browning matches the middle column, no action is needed. If your arborvitae is losing needles only inside the canopy, seasonal needle drop is the most likely explanation, so just rake up the dropped needles from around the root zone.
2. Not Watering Enough Can Cause an Arborvitae to Turn Brown
Common Signs Your Arborvitae Is Suffering From Drought Stress
Underwatered arborvitae turn a dull grayish green before browning, usually starting with brown tips at the ends of the branches. Foliage feels dry and brittle instead of soft and pliable.
This shows up fastest in newly planted trees, since their root systems haven’t spread into the surrounding soil yet.
How Much Water Does an Arborvitae Really Need?
| Tree Age | Watering Frequency | Amount |
|---|---|---|
| Newly planted (year 1) | 2 to 3 times per week | 5 to 10 gallons per tree |
| Established (2+ years) | Weekly during dry spells | 10 to 15 gallons per tree |
| Mature, drought conditions | Deep soak every 1 to 2 weeks | 15 to 20 gallons per tree |
Water slowly at the base so it soaks down 8 to 12 inches instead of running off the surface. A soaker hose left on for an hour does this better than an overhead sprinkler.
Established arborvitae are much more drought tolerant than newly planted trees, but even mature trees benefit from deep watering during long summer dry spells.
3. Overwatering and Poor Drainage Can Suffocate Arborvitae Roots
How Overwatering Causes Arborvitae Roots to Rot and Turn Brown
Roots need oxygen as much as they need water. Soil that stays soggy prevents the roots from getting enough oxygen, and root rot can set in within days.
Once roots rot, the tree can’t pull up water at all, even though the soil is wet. From the outside, it often looks exactly like drought damage, which is why overwatered and underwatered arborvitae get confused so often.
Drought vs. Overwatering: Quick Comparison
| Clue | Underwatered | Overwatered / Root Rot |
|---|---|---|
| Soil feel | Dry, crumbly several inches down | Wet, heavy, sometimes smells sour |
| Foliage texture | Dry, brittle, dull color | Soft, sometimes yellow before brown |
| Where browning starts | Tips first | Bottom branches or whole sections first |
The Best Way to Improve Drainage Around Arborvitae
Check drainage before you plant. Dig a hole 12 inches deep, fill it with water, and see how long it takes to drain.
If the water disappears within an hour, drainage is good. Water still sitting after 4 hours means you need to fix the soil or pick a different spot for a clay-heavy yard.
Working compost or aged organic matter into heavy clay improves drainage over time. Our guide to improving garden soil covers the exact amendments that work for clay versus sandy soil.
If your privacy hedge is turning brown instead of just one tree, check watering and drainage first before treating for pests, since a whole-row problem usually points to the growing conditions rather than an isolated bug or disease issue.
4. Winter Burn Is One of the Most Common Reasons Arborvitae Turn Brown
Why Evergreen Trees Dry Out During Winter
Arborvitae keep their needles all winter, which means they keep losing water through them all winter too. When the ground freezes, roots can’t replace that lost moisture.
Add strong winter sun or wind, and the foliage dries out and slowly turns reddish-brown, usually on the side facing the weather. Many homeowners notice their arborvitae turning brown after winter as soon as the snow melts, since the damage was happening underneath all along.
Simple Ways to Protect Arborvitae From Winter Burn
- Water deeply through fall until the ground freezes
- Apply 2 to 3 inches of mulch to hold soil moisture around the root zone
- Set up a burlap screen on the south or west side in exposed yards
- Skip anti-desiccant sprays unless your extension office recommends them for your climate
The University of Wisconsin Horticulture Division notes that winter burn affects scale-leaved evergreens like arborvitae most in open, exposed sites, and you’ll usually notice symptoms as the snow melts in spring. The University of Minnesota Extension adds that winter injury typically browns foliage from the tip of the branch inward, with the base staying green and damage often worse at the top of the tree.
Winter Burn vs. Root Rot: Quick Comparison
| Clue | Winter Burn | Root Rot |
|---|---|---|
| Timing | Shows up after winter, as snow melts | Any season, tied to wet soil |
| Location | South or west side, tips first | Bottom branches first |
| Foliage and roots | Dry, brittle foliage, roots intact | Foliage may look fine at first, roots mushy |
5. Road Salt and De-Icing Chemicals Can Burn Arborvitae Foliage
How to Recognize Salt Damage on Arborvitae
Salt damage looks a lot like winter burn, but it’s one-sided and always faces a road, sidewalk, or driveway. Salt spray from passing cars or splashed slush lands directly on the foliage.
Salt that builds up in the soil from runoff causes a second type of damage: it pulls water out of the roots, so the whole tree can brown even on the side facing away from the road.
Ways to Protect Trees Growing Near Roads and Driveways
Rinse foliage with plain water after a thaw if salt spray hit the tree directly. Flush the soil with extra water in early spring to push salt below the root zone.
For new plantings near roads, choose a salt-tolerant screen variety or set trees back at least 10 feet from where plows throw snow.
6. Root Damage Can Cause an Arborvitae to Suddenly Turn Brown
Landscaping Mistakes That Injure Arborvitae Roots
Digging for a fence line, trenching for irrigation, or running heavy equipment over the root zone can sever or crush roots you never see. Symptoms often lag weeks behind the actual injury.
Sudden, one-sided browning after any nearby digging or construction points straight to root damage rather than weather or pests.
Can a Tree Recover After Root Damage?
Minor root loss, under 20 percent of the root system, usually recovers with consistent watering and no fertilizer for the rest of the season. Losses beyond that often mean permanent dieback on the affected side.
Avoid digging within the drip line, the circle marked by the outer edge of the branches, whenever possible.
7. Extreme Summer Heat Can Leave Arborvitae Brown and Stressed
How Heat Stress Affects Evergreen Trees
If your arborvitae is turning brown in summer, drought and prolonged heat are usually the first things to check before anything else. Above 90°F, arborvitae close their pores to conserve water, which also blocks the cooling effect of transpiration. Prolonged heat waves leave brown tips first, especially on the sun-facing side of the canopy.
Heat stress becomes much worse when it’s paired with drought, which is why late July and August cause the most damage across the US.
Tips for Keeping Arborvitae Healthy During Heat Waves
Water early in the morning so moisture soaks in before the heat of the day builds. Add mulch to keep root zone temperatures down.
Avoid pruning or fertilizing during a heat wave. Both push the tree to spend resources it doesn’t have available.
8. Planting Your Arborvitae Too Deep Can Lead to Slow Decline
Why the Root Flare Should Always Stay Above the Soil
The root flare is the point where the trunk widens into roots. Buried even 2 to 3 inches deep, it traps moisture against the bark and invites rot.
Deep planting causes slow, gradual browning over a year or more rather than a sudden change, which makes it easy to miss until the established tree is already struggling.
How to Fix an Improperly Planted Arborvitae
Scrape back mulch and soil until you can see the flare. If it’s buried, pull the excess soil away from the trunk in a wide, shallow bowl shape instead of a mound.
For trees planted too deep in the actual hole, replanting at the correct depth is worth doing within the first year or two.
9. Nutrient Deficiencies Can Make Arborvitae Lose Their Healthy Green Color
Which Nutrient Deficiencies Cause Arborvitae to Turn Yellow or Brown?
| Nutrient | Deficiency Symptom | Common Cause |
|---|---|---|
| Nitrogen | Overall pale, yellow-green color | Poor or sandy soil |
| Iron | Yellowing between veins on new growth | High soil pH |
| Magnesium | Older needles turn yellow, then brown | Sandy, leached soil |
When Fertilizer Helps, and When It Doesn’t
Fertilizer helps when a soil test actually shows a deficiency. It does nothing for browning caused by drought, root rot, or winter burn, and can make those problems worse.
If you fertilize, use a slow-release, balanced formula in early spring, never in late summer or fall.
10. Spider Mites Can Make Arborvitae Turn Brown Without You Noticing
How to Check for Spider Mites in a Few Minutes
Hold a sheet of white paper under a branch and tap it hard. Spider mites show up as tiny moving specks, smaller than a pinhead.
Fine webbing between needles is another giveaway, especially during hot, dry stretches when mite populations explode across the whole hedge.
The Best Ways to Get Rid of Spider Mites Naturally
A strong blast of water from a hose every few days knocks mites off and breaks up their webbing much more effectively than most people expect. For heavier infestations, insecticidal soap or horticultural oil applied to the undersides of foliage works without harming beneficial insects.
11. Bagworms Can Quickly Damage and Kill Arborvitae Trees
How to Identify Bagworms Before Serious Damage Occurs
Bagworms build 1 to 2 inch spindle-shaped bags out of silk and foliage that hang from branches. They’re easy to mistake for pinecones until you look closely.
By the time bagworm damage is obvious, the caterpillars inside have already eaten a significant amount of foliage.
How to Get Rid of Bagworms Before They Kill Your Arborvitae
Hand-pick and destroy bags from fall through early spring, before eggs hatch. Once caterpillars are active in early summer, Bacillus thuringiensis (Bt) sprays target them without harming other insects.
Spider Mites vs. Bagworms: Quick Comparison
| Clue | Spider Mites | Bagworms |
|---|---|---|
| Visible sign | Fine webbing, tiny moving dots | Cone-shaped bags on branches |
| Worst season | Hot, dry summer | Late spring through summer |
| Fastest fix | Hose spray, insecticidal soap | Hand-picking, Bt spray |
12. Fungal Diseases Can Cause Arborvitae Branches to Turn Brown
Fungal problems usually show up as brown branches scattered through the canopy rather than an even pattern, sometimes along with small brown spots on individual needles before the whole branch fails.
Common Arborvitae Diseases That Cause Browning
| Disease | Where It Starts | Key Sign |
|---|---|---|
| Phytophthora root rot | Roots in wet soil | Whole-tree decline, no recovery with water |
| Kabatina blight | Branch tips | Needle blight in late winter or spring |
| Cercospora blight | Lower, inner branches | Browning moves upward over seasons |
How Better Air Circulation Helps Prevent Disease
Fungal spores thrive in still, damp air trapped between crowded plants. Spacing trees properly at planting and thinning dense interior growth cuts disease risk significantly.
Water at the base instead of overhead to keep foliage dry, which limits the moisture fungi need to spread through the canopy.
13. Deer, Rabbits, and Other Animals Can Damage Arborvitae
Signs Wildlife Is Feeding on Your Arborvitae
Deer leave ragged, torn browsing marks since they lack upper front teeth, usually up to 6 feet high. Rabbits clip clean, angled cuts lower on the plant, especially in winter when snow forces them to reach higher.
Arborvitae is one of the most preferred winter browse plants for deer across the eastern and midwestern United States, which is why damage often appears suddenly after the first hard frost.
How to Protect Arborvitae From Deer, Rabbits, and Other Wildlife
Physical barriers like burlap wrap or wire fencing work more reliably than repellent sprays, especially in high-pressure deer areas. Reapply taste or scent repellents every 2 to 4 weeks if you go that route, since rain washes them off.
14. Herbicides and Lawn Chemicals Can Accidentally Damage Arborvitae
How Chemical Drift Causes Brown Foliage
Broadleaf weed killers applied to nearby lawns on a windy day can drift onto arborvitae foliage. Symptoms include twisted new growth, followed by browning within one to two weeks.
Granular weed and feed products can also wash into the root zone during heavy rain, causing root-level damage that’s harder to trace back.
Safe Lawn Care Practices Around Evergreen Trees
Spray herbicides only on calm days, and keep a buffer zone of at least 10 feet around evergreen plantings. Use a shielded sprayer nozzle near the base of any tree.
15. Pruning Arborvitae the Wrong Way Can Leave Permanent Brown Patches
Why Arborvitae Rarely Grow Back From Old Wood
Unlike many flowering shrubs, arborvitae buds live mostly in the green, actively growing parts of the branch. Cut back into bare, woody interior growth, and that spot often never fills back in.
The Right Time and Way to Prune Arborvitae
Prune in late spring after the first flush of new growth, cutting only into green foliage. Never shear back past where green growth starts, no matter how overgrown the hedge looks.
16. Newly Planted Arborvitae Often Turn Brown Because of Transplant Shock
Why Newly Planted Arborvitae Struggle at First
Newly planted arborvitae turning brown is one of the most common questions homeowners ask, and it almost always traces back to transplant shock rather than anything more serious. Nursery-grown roots are used to frequent watering in a container. Once planted in the ground, that same root system has to expand into native soil, and it can take a full season to catch up.
Browning from transplant shock typically appears 2 to 6 weeks after planting and can affect random branches rather than one clear side, which is what makes it different from winter burn or salt damage.
How to Help Your Tree Recover Faster
Stick to a consistent watering schedule for the entire first year, don’t fertilize at planting, and skip pruning until the tree shows strong new growth. Our deep watering guide has a simple method that works well for new plantings even if you’re away for a few days.
17. An Old or Severely Stressed Arborvitae May Be Near the End of Its Life
How to Tell If Your Arborvitae Can Still Be Saved
Scratch a small patch of bark on a few branches with your fingernail. Green tissue underneath means that branch is alive and dormant, not dead. Dry, brown, brittle tissue all the way through means it’s dead.
A tree with green tissue on more than half its branches usually has a real chance at recovery with consistent care.
When It’s Better to Replace the Tree
If the trunk itself is brown and brittle, or more than two-thirds of the branches show no green tissue, recovery is unlikely. Established arborvitae typically live 30 to 50 years with good care, so a severely stressed young tree is often cheaper and faster to replace than to nurse back over several seasons.
How to Figure Out Exactly Why Your Arborvitae Is Turning Brown
Before You Treat Anything, Check These 5 Things First
- Soil moisture: dig 4 inches down and feel for dry versus soggy soil
- Recent weather: note any hard freeze, heat wave, or drought in the past few weeks
- Bugs and webbing: tap a branch over white paper and look closely at the foliage
- Drainage: check if water pools near the base after rain
- Root flare: confirm it’s visible above the soil, not buried under mulch
Check Whether the Browning Starts Inside, Outside, Top, or Bottom
| Pattern | Likely Cause |
|---|---|
| Inside only, near trunk | Normal seasonal needle drop |
| Tips only, all around | Drought, heat, or winter burn |
| One side facing a road | Salt spray or reflected heat |
| Bottom up | Root rot, poor drainage, or animal browsing |
Look Closely for Insects, Diseases, and Damaged Roots
Tap branches over white paper to check for mites. Look for bagworm bags, webbing, or sticky residue on the needles. Dig gently near the base to check root color and firmness, since healthy roots are white to tan and firm, not black and mushy.
Think About Recent Weather, Watering, and Lawn Care
Match the timing of the browning to recent events: a cold snap, a dry spell, a nearby herbicide application, or new construction. Timing is often the fastest way to confirm a cause.
How to Save an Arborvitae That’s Turning Brown Before It’s Too Late
Quick steps: check soil moisture, identify pests or disease, remove dead branches, water correctly for the season, then mulch and wait. Details on each step below.
How Long Does It Take an Arborvitae to Recover?
| Cause | Typical Recovery Time |
|---|---|
| Drought stress | 2 to 8 weeks after consistent watering |
| Winter burn | One full growing season |
| Spider mites | Several weeks after treatment |
| Root rot | Often poor, depends on severity |
| Transplant shock | One growing season |
Remove Dead Branches Without Damaging Healthy Growth
Cut dead branches back to a healthy junction, never into bare wood you’re hoping will regrow. Sanitize pruning shears between cuts if disease is suspected.
Water Deeply Instead of Watering More Often
One deep soaking a week beats five light sprinkles. Deep watering pushes roots downward, where soil stays moist longer between waterings.
Add Mulch to Protect the Roots Year-Round
A 2 to 3 inch layer, kept a few inches away from the trunk, buffers soil temperature and moisture in every season. Use our mulch calculator to figure out exactly how much you need for the space around your tree.
Treat Pests and Diseases as Soon as You Find Them
Early treatment for mites, bagworms, or fungal issues stops damage before it becomes permanent. Waiting even a few weeks can turn a treatable problem into lost branches.
Give Your Arborvitae Time to Recover Naturally
Recovery from stress usually takes one full growing season, sometimes two. Resist the urge to fertilize heavily or over-prune while you wait, since both add more stress on top of what the tree is already dealing with.
How to Keep Your Arborvitae Green and Healthy All Year Long
Water Properly During Every Season
Keep watering through fall until the ground freezes, and don’t stop just because summer ends.
Avoid Common Planting and Pruning Mistakes
Plant at the correct depth, space trees properly for a full-grown hedge, and prune only into green growth.
Check Regularly for Pests Before They Spread
A five-minute check every couple of weeks during growing season catches mites and bagworms early, when they’re easiest to control.
Protect Arborvitae From Winter Wind and Ice
Burlap screens on exposed sides and a solid fall watering routine prevent most winter burn before it starts.
Choose the Best Location Before Planting
Well-drained soil, protection from harsh west or north winds, and distance from roads and salt spray all reduce future problems significantly for any evergreen screening project.
Frequently Asked Questions About Arborvitae Turning Brown
Can a brown arborvitae turn green again?
Branches with green tissue under the bark can recover with consistent watering and time, often within one growing season. Branches that are fully brown and brittle all the way through are dead and won’t turn green again.
Why is my arborvitae turning brown from the inside?
Interior browning near the trunk is usually normal seasonal needle drop, which happens once a year as the plant sheds its oldest foliage. It only becomes a concern if it spreads outward to newer growth.
Why is my arborvitae turning brown from the bottom?
Bottom-up browning usually points to root rot from poor drainage, since the lowest, oldest roots sit in the wettest soil first. Check for soggy ground and mushy roots before assuming it’s a seasonal issue.
Why is only one side of my arborvitae turning brown?
One-sided browning is almost always caused by an external, direction-specific factor, such as road salt, reflected winter sun, or drying wind hitting that one side. It’s rarely a sign of disease, which tends to spread more evenly.
Why did my arborvitae suddenly turn brown?
Sudden browning with no obvious weather cause usually means root damage from nearby digging, trenching, or construction. Symptoms can lag several weeks behind the actual root injury.
Why is my emerald green arborvitae turning brown?
Emerald Green varieties are especially sensitive to winter burn and drought stress due to their compact, shallow root systems. Check soil moisture and sun exposure first before assuming pests or disease.
Should I cut off brown arborvitae branches?
Remove branches only once you’ve confirmed they’re fully dead by scratching the bark and finding no green underneath. Cutting live branches back into bare wood leaves a permanent gap that won’t fill in.
Can overwatering make arborvitae turn brown?
Yes, overwatering and poor drainage suffocate roots and cause rot, which produces browning that looks identical to drought stress. Checking soil moisture directly is the only reliable way to tell the two apart.
Why are my arborvitae tips turning brown?
Brown tips are usually the first sign of drought, heat stress, or winter burn, since the newest growth at the ends of branches loses moisture fastest. Check soil moisture and recent weather before assuming pests or disease.
Why are my arborvitae branches turning brown?
Whole branches turning brown, rather than just the tips, usually points to something more serious: root damage, fungal disease, or a heavy bagworm infestation. Inspect the base of the affected branch and the roots underneath it for the real cause.
Can drought kill arborvitae?
Yes, extended drought can kill an arborvitae if the root system dries out completely, especially in newly planted trees with limited root reach. Consistent deep watering during dry spells prevents most drought deaths.
Can too much water kill arborvitae?
Yes, soil that stays saturated for weeks causes root rot, which can kill an arborvitae just as effectively as drought. Good drainage at planting time is the best long-term prevention.
Why is my arborvitae turning yellow then brown?
Yellowing before browning usually signals a nutrient deficiency, early root stress, or the start of a fungal disease rather than simple seasonal shedding. A soil test helps confirm whether nutrients are the cause.
How do you know if an arborvitae is dead?
Scratch the bark on several branches and the main trunk. No green tissue anywhere, combined with brittle, dry wood throughout, means the tree is dead and won’t recover.
How long does it take a stressed arborvitae to recover?
Most arborvitae need one full growing season to bounce back from drought, transplant shock, or minor winter burn. Severe root damage or disease can take two seasons or longer, if recovery happens at all.
Disclaimer: Information on this site is for educational purposes only. Results vary by climate, soil, weather, and growing conditions. For region-specific advice, consult your local USDA Cooperative Extension Service before making major gardening or soil changes.