Troubleshooting
Tree Wormwood problems — and how to fix them
Tree Wormwood (Artemisia arborescens) 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.
Winter root rot
The leading cause of death in temperate climates. Wet, cold soil kills roots even when air temperatures are above freezing. Grow in raised beds or add thick grit drainage layer; avoid clay soils.
Frost dieback
Top growth blackens below about -5°C. In borderline zones, hard prune dead stems in spring; the shrub often regenerates from the base if roots were protected. Fleece plants during hard frosts.
Aphid colonies
Soft spring growth attracts aphids. Hose off with water or apply insecticidal soap; avoid systemic insecticides in herb gardens.
Prevent tree wormwood problems before they start
Most tree wormwood issues are care-mismatch, not bad luck. Dial in the basics:
Tree Wormwood problems — FAQ
Why is my tree wormwood winter root rot?
The leading cause of death in temperate climates. Wet, cold soil kills roots even when air temperatures are above freezing. Grow in raised beds or add thick grit drainage layer; avoid clay soils.
Why is my tree wormwood frost dieback?
Top growth blackens below about -5°C. In borderline zones, hard prune dead stems in spring; the shrub often regenerates from the base if roots were protected. Fleece plants during hard frosts.
Why is my tree wormwood aphid colonies?
Soft spring growth attracts aphids. Hose off with water or apply insecticidal soap; avoid systemic insecticides in herb gardens.