Troubleshooting
Cut-leaved Selfheal problems — and how to fix them
Cut-leaved Selfheal (Prunella laciniata) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
White mealy coating appears on leaves in warm, humid or stagnant conditions; improve air flow, avoid wetting foliage when watering, and remove affected material promptly.
Crown rot in wet soils
Plants collapse at the crown if grown in waterlogged or heavy clay soils; always plant into sharply drained substrate and top-dress with coarse grit.
Prevent cut-leaved selfheal problems before they start
Most cut-leaved selfheal issues are care-mismatch, not bad luck. Dial in the basics:
Cut-leaved Selfheal problems — FAQ
Why is my cut-leaved selfheal powdery mildew?
White mealy coating appears on leaves in warm, humid or stagnant conditions; improve air flow, avoid wetting foliage when watering, and remove affected material promptly.
Why is my cut-leaved selfheal crown rot in wet soils?
Plants collapse at the crown if grown in waterlogged or heavy clay soils; always plant into sharply drained substrate and top-dress with coarse grit.