Troubleshooting
Sichuan Arborvitae problems — and how to fix them
Sichuan Arborvitae (Thuja sutchuenensis) 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.
Root rot
Caused by waterlogged soil; ensure excellent drainage and avoid overwatering.
Spider mites
Small webbing on foliage in hot, dry conditions; increase humidity and treat with insecticidal soap.
Bagworms
Caterpillars that create spindle-shaped bags on branches; remove by hand or treat with Bt in early summer.
Winter browning
Foliage may scorch in exposed, windy sites; plant in a sheltered position or use windbreak netting.
Prevent sichuan arborvitae problems before they start
Most sichuan arborvitae issues are care-mismatch, not bad luck. Dial in the basics:
Sichuan Arborvitae problems — FAQ
Why is my sichuan arborvitae root rot?
Caused by waterlogged soil; ensure excellent drainage and avoid overwatering.
Why is my sichuan arborvitae spider mites?
Small webbing on foliage in hot, dry conditions; increase humidity and treat with insecticidal soap.
Why is my sichuan arborvitae bagworms?
Caterpillars that create spindle-shaped bags on branches; remove by hand or treat with Bt in early summer.
Why is my sichuan arborvitae winter browning?
Foliage may scorch in exposed, windy sites; plant in a sheltered position or use windbreak netting.