Troubleshooting
Fairies' Thimbles problems — and how to fix them
Fairies' Thimbles (Campanula cochleariifolia) 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.
Crown rot
Caused by waterlogged soil or poor drainage, especially in winter. Plant in gritty compost, raise containers on feet, and avoid overhead watering. Remove affected crowns promptly.
Slugs and snails
Young growth is attractive to slugs. Use grit mulch around the crown as a physical deterrent, or apply organic slug pellets (ferric phosphate) in spring when new shoots emerge.
Powdery mildew
Can appear in warm, humid, still conditions. Improve air circulation by thinning overcrowded mats. Treat with a sulphur-based fungicide if severe.
Prevent fairies' thimbles problems before they start
Most fairies' thimbles issues are care-mismatch, not bad luck. Dial in the basics:
Fairies' Thimbles problems — FAQ
Why is my fairies' thimbles crown rot?
Caused by waterlogged soil or poor drainage, especially in winter. Plant in gritty compost, raise containers on feet, and avoid overhead watering. Remove affected crowns promptly.
Why is my fairies' thimbles slugs and snails?
Young growth is attractive to slugs. Use grit mulch around the crown as a physical deterrent, or apply organic slug pellets (ferric phosphate) in spring when new shoots emerge.
Why is my fairies' thimbles powdery mildew?
Can appear in warm, humid, still conditions. Improve air circulation by thinning overcrowded mats. Treat with a sulphur-based fungicide if severe.