Troubleshooting
Lemon Catnip problems — and how to fix them
Lemon Catnip (Nepeta cataria 'Citriodora') 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.
Powdery mildew
Appears as white powdery coating on leaves in humid, low-airflow conditions. Improve spacing and air circulation; cut back affected stems. Avoid wetting foliage.
Floppy, sprawling stems
Caused by too much shade or over-fertilising with nitrogen. Move to full sun and cut back to 10 cm after the first flush to stimulate compact regrowth.
Crown rot
Results from poorly drained soil or overwatering. Ensure excellent drainage; do not mulch directly over the crown. Remove and destroy affected plants.
Prevent lemon catnip problems before they start
Most lemon catnip issues are care-mismatch, not bad luck. Dial in the basics:
Lemon Catnip problems — FAQ
Why is my lemon catnip powdery mildew?
Appears as white powdery coating on leaves in humid, low-airflow conditions. Improve spacing and air circulation; cut back affected stems. Avoid wetting foliage.
Why is my lemon catnip floppy, sprawling stems?
Caused by too much shade or over-fertilising with nitrogen. Move to full sun and cut back to 10 cm after the first flush to stimulate compact regrowth.
Why is my lemon catnip crown rot?
Results from poorly drained soil or overwatering. Ensure excellent drainage; do not mulch directly over the crown. Remove and destroy affected plants.