Troubleshooting
Western Arborvitae Zebrina problems — and how to fix them
Western Arborvitae Zebrina (Thuja plicata 'Zebrina') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Interior browning
Drought, waterlogging or normal seasonal shedding cause inner foliage to brown; keep soil evenly moist and water deeply in dry spells.
Spider mites
Hot, dry, dusty conditions invite mites that stipple and bronze foliage; rinse plants and improve air humidity, treat heavy infestations with horticultural oil.
Reverted green growth
Variegated forms occasionally throw all-green shoots that are more vigorous; prune these out promptly to preserve the gold banding.
Winter foliage bronzing
Cold, windy sites can bronze the foliage over winter; colour usually recovers in spring, but shelter from drying winds reduces it.
Prevent western arborvitae zebrina problems before they start
Most western arborvitae zebrina issues are care-mismatch, not bad luck. Dial in the basics:
- Common western red cedar problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Western Arborvitae Zebrina watering schedule
- Western Arborvitae Zebrina light requirements
- Best soil mix for western arborvitae zebrina
- Western Arborvitae Zebrina temperature & humidity
- Full western arborvitae zebrina care guide
Looking for western arborvitae zebrina in general rather than its problems? Read the full western arborvitae zebrina care guide — light, water, soil and feeding.
Western Arborvitae Zebrina problems — FAQ
Why is my western arborvitae zebrina interior browning?
Drought, waterlogging or normal seasonal shedding cause inner foliage to brown; keep soil evenly moist and water deeply in dry spells.
Why is my western arborvitae zebrina spider mites?
Hot, dry, dusty conditions invite mites that stipple and bronze foliage; rinse plants and improve air humidity, treat heavy infestations with horticultural oil.
Why is my western arborvitae zebrina reverted green growth?
Variegated forms occasionally throw all-green shoots that are more vigorous; prune these out promptly to preserve the gold banding.
Why is my western arborvitae zebrina winter foliage bronzing?
Cold, windy sites can bronze the foliage over winter; colour usually recovers in spring, but shelter from drying winds reduces it.