Troubleshooting
Nepeta 'Six Hills Giant' problems — and how to fix them
Nepeta 'Six Hills Giant' (Nepeta 'Six Hills Giant') 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.
Mid-season collapse
The clump can splay open and look tired after the first flush. Shear hard by a third to a half to trigger fresh growth and a second bloom.
Cats rolling on plants
The aromatic foliage attracts cats that flatten and crush young plants. Protect with low twiggy supports until established.
Crown rot in wet soil
Heavy, wet ground rots the crown, especially in winter. Plant in sharply drained soil and add grit to clay.
Powdery mildew
Can appear in humid, crowded conditions or after drought stress. Improve airflow and cut back affected growth.
Prevent nepeta 'six hills giant' problems before they start
Most nepeta 'six hills giant' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for nepeta 'six hills giant' in general rather than its problems? Read the full nepeta 'six hills giant' care guide — light, water, soil and feeding.
Nepeta 'Six Hills Giant' problems — FAQ
Why is my nepeta 'six hills giant' mid-season collapse?
The clump can splay open and look tired after the first flush. Shear hard by a third to a half to trigger fresh growth and a second bloom.
Why is my nepeta 'six hills giant' cats rolling on plants?
The aromatic foliage attracts cats that flatten and crush young plants. Protect with low twiggy supports until established.
Why is my nepeta 'six hills giant' crown rot in wet soil?
Heavy, wet ground rots the crown, especially in winter. Plant in sharply drained soil and add grit to clay.
Why is my nepeta 'six hills giant' powdery mildew?
Can appear in humid, crowded conditions or after drought stress. Improve airflow and cut back affected growth.