Arborvitae turns brown for many reasons, and the pattern matters. Brown inner foliage in fall may be normal needle shedding. Brown outer tips after winter may be winter burn. Patchy dead branches can point to pests, root stress, deer, salt, or disease. A whole plant browning from the base can signal serious root trouble.
The hardest truth: brown arborvitae foliage usually does not turn green again. Recovery depends on whether living buds and green tissue remain.
If you planted arborvitae for screening, compare Fast-Growing Privacy Trees That Are Not Invasive and Best Hedge Plants for Privacy.
Last updated: June 6, 2026.
Quick Answer
Arborvitae most often turns brown from drought stress, winter burn, normal inner needle drop, spider mites, bagworms, deer browsing, salt exposure, transplant shock, overwatering, or root rot. Check soil moisture, browning pattern, pests, and whether stems are still green before pruning or replacing.
Browning Pattern Clues
| What you see | Likely cause |
|---|---|
| Inner needles brown in fall | normal needle drop |
| Outer side brown after winter | winter burn |
| Brown lower browse line | deer damage |
| Fine stippling or bronzing | spider mites |
| Bag-like cases on stems | bagworms |
| One branch dies suddenly | injury, pests, canker, root issue |
| Entire plant browns | drought, root rot, planting problem |
| Roadside browning | salt or reflected heat |
Drought Stress
Arborvitae needs consistent moisture during establishment. Newly planted rows often fail because each plant is watered lightly instead of deeply.
Fix:
- check soil 4 to 6 inches deep
- water deeply when dry
- mulch root zone 2 to 3 inches deep
- keep mulch off the trunk
- water before winter if fall is dry
- avoid daily shallow watering
For irrigation mistakes, read Irrigation Mistakes That Kill Plants.
Winter Burn
Winter burn occurs when foliage loses water while roots cannot replace it from frozen or dry soil. It is common on exposed sides facing sun and wind.
Reduce risk by:
- watering before soil freezes
- mulching roots
- avoiding late-season heavy nitrogen
- screening exposed young plants from winter wind
- planting in sites with enough soil moisture
Wait until spring growth begins before deciding how much to prune.
Normal Inner Needle Drop
Evergreens do not keep every needle forever. Arborvitae often sheds older inner foliage, especially in fall. If the outer shell remains green and healthy, this is usually normal.
Do not shear into bare brown interior wood expecting it to fill in quickly. Arborvitae has limited ability to regrow from old bare stems.
Spider Mites and Bagworms
Spider mites can cause bronzing and fine webbing, especially during hot dry weather. Bagworms create small hanging bags that resemble bits of foliage and can defoliate branches.
What to do:
- inspect closely
- use a white paper tap test for mites
- hand-pick bagworms when feasible
- identify before spraying
- follow pesticide labels exactly
- avoid broad sprays that kill beneficial insects unnecessarily
For general pest timing, read Organic Pest Control Calendar by Season.
Deer Damage
Deer commonly browse arborvitae, creating a flat lower browse line. Once lower branches are bare, they may not refill well.
Protect with:
- fencing
- netting
- trunk and shrub guards
- repellents rotated by label
- more deer-resistant screen plants
See How to Protect Young Trees From Deer.
When to Replace
Replace the plant if:
- most foliage is brown
- stems are brittle and dead
- roots smell rotten
- bark is loose
- the plant rocks from root loss
- deer have stripped it beyond recovery
- the site is too dry, wet, salty, or shady for arborvitae
If only the outer tips are brown, wait for spring growth before pruning.
FAQ
Will brown arborvitae turn green again?
Brown dead foliage will not turn green. The plant may fill in with new growth if enough live tissue remains.
Should I cut brown branches off arborvitae?
Remove dead, broken, or diseased branches, but wait until spring to judge winter damage. Do not cut deep into bare old wood unless you accept a permanent gap.
How often should I water new arborvitae?
Water deeply whenever the root zone begins to dry. Frequency depends on soil, weather, mulch, and plant size. Check soil moisture instead of watering by guess.
Related Reading
- Fast-Growing Privacy Trees That Are Not Invasive
- Best Hedge Plants for Privacy
- How to Protect Young Trees From Deer
- Irrigation Mistakes That Kill Plants