Problem
Why does my catmint 'Six Hills Giant' have brown leaves?
Nepeta × faassenii 'Six Hills Giant'
Brown leaves on a catmint 'Six Hills Giant' usually has one of three causes — watering, light or a pest. Walk through them in order before reaching for a treatment.
Most likely causes
Detailed cause-by-cause guide is being prepared. In the meantime: check watering rhythm, sunlight match, and any visible pests on the underside of leaves.