Troubleshooting
Coris-Leaved St John's Wort problems — and how to fix them
Coris-Leaved St John's Wort (Hypericum coris) 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.
Root and crown rot
The most common cause of failure; results from waterlogged soil especially in winter — ensure very sharp drainage and avoid overhead watering.
Rust (Melampsora spp.)
Orange pustules may appear on the undersides of leaves in damp summers; improve air circulation and remove affected stems promptly.
Prevent coris-leaved st john's wort problems before they start
Most coris-leaved st john's wort issues are care-mismatch, not bad luck. Dial in the basics:
Coris-Leaved St John's Wort problems — FAQ
Why is my coris-leaved st john's wort root and crown rot?
The most common cause of failure; results from waterlogged soil especially in winter — ensure very sharp drainage and avoid overhead watering.
Why is my coris-leaved st john's wort rust (melampsora spp.)?
Orange pustules may appear on the undersides of leaves in damp summers; improve air circulation and remove affected stems promptly.