Troubleshooting
Catnip problems — and how to fix them
Catnip (Nepeta cataria) 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.
Cats roll on the plant and crush it
Plant in a wire cloche or grow in a hanging pot until established.
Self-seeds aggressively
Cut back before seed sets.
Leggy after flowering
Shear back hard for a fresh flush.
Powdery mildew
Improve air flow.
Aphids
Rinse off; ladybirds clean up quickly.
Prevent catnip problems before they start
Most catnip issues are care-mismatch, not bad luck. Dial in the basics:
Catnip problems — FAQ
Why is my catnip cats roll on the plant and crush it?
Plant in a wire cloche or grow in a hanging pot until established.
Why is my catnip self-seeds aggressively?
Cut back before seed sets.
Why is my catnip leggy after flowering?
Shear back hard for a fresh flush.
Why is my catnip powdery mildew?
Improve air flow.
Why is my catnip aphids?
Rinse off; ladybirds clean up quickly.