Troubleshooting
Bai Zhi problems — and how to fix them
Bai Zhi (Angelica dahurica) 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.
Furanocoumarin phototoxicity when harvesting
Handling fresh stems or roots in bright sunlight can cause blistering and hyperpigmentation on bare skin. Always wear long gloves and cover arms when cutting stems or harvesting roots.
Crown rot in waterlogged soil
The fleshy taproot is susceptible to Phytophthora and Pythium root rots in poorly drained sites. Improve drainage with grit or raised beds and avoid overhead irrigation in autumn.
Aphids and carrot fly larvae
Aphids cluster on young growth and flower stems; carrot fly (Psila rosae) larvae can tunnel into the root. Use fine mesh crop covers and companion planting with alliums to deter flies.
Prevent bai zhi problems before they start
Most bai zhi issues are care-mismatch, not bad luck. Dial in the basics:
Bai Zhi problems — FAQ
Why is my bai zhi furanocoumarin phototoxicity when harvesting?
Handling fresh stems or roots in bright sunlight can cause blistering and hyperpigmentation on bare skin. Always wear long gloves and cover arms when cutting stems or harvesting roots.
Why is my bai zhi crown rot in waterlogged soil?
The fleshy taproot is susceptible to Phytophthora and Pythium root rots in poorly drained sites. Improve drainage with grit or raised beds and avoid overhead irrigation in autumn.
Why is my bai zhi aphids and carrot fly larvae?
Aphids cluster on young growth and flower stems; carrot fly (Psila rosae) larvae can tunnel into the root. Use fine mesh crop covers and companion planting with alliums to deter flies.