Troubleshooting
Alpine Mouse-ear problems — and how to fix them
Alpine Mouse-ear (Cerastium alpinum) 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.
Winter rot in wet conditions
The primary cultivation challenge. In areas with wet winters, grow under glass in an alpine house or cold frame, or ensure a gravel collar and sharp overhead drainage. A pane of glass over plants outdoors can be sufficient protection in maritime climates.
Botrytis (grey mould)
Affects foliage in humid, still air, particularly during mild wet winters. Good air circulation and overhead dryness are preventative. Remove affected tissue immediately and improve ventilation.
Difficulty in hot, lowland climates
Cerastium alpinum is a true arctic-alpine specialist that suffers in warm, humid lowland summers. In USDA zones above 6, it is very difficult to maintain. Cool, north-facing aspects or high-elevation gardens offer the best chance of success.
Prevent alpine mouse-ear problems before they start
Most alpine mouse-ear issues are care-mismatch, not bad luck. Dial in the basics:
Alpine Mouse-ear problems — FAQ
Why is my alpine mouse-ear winter rot in wet conditions?
The primary cultivation challenge. In areas with wet winters, grow under glass in an alpine house or cold frame, or ensure a gravel collar and sharp overhead drainage. A pane of glass over plants outdoors can be sufficient protection in maritime climates.
Why is my alpine mouse-ear botrytis (grey mould)?
Affects foliage in humid, still air, particularly during mild wet winters. Good air circulation and overhead dryness are preventative. Remove affected tissue immediately and improve ventilation.
Why is my alpine mouse-ear difficulty in hot, lowland climates?
Cerastium alpinum is a true arctic-alpine specialist that suffers in warm, humid lowland summers. In USDA zones above 6, it is very difficult to maintain. Cool, north-facing aspects or high-elevation gardens offer the best chance of success.