Overwintering guide
How to overwinter campanula portenschlagiana
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills campanula portenschlagiana in winter
Cutting campanula portenschlagiana hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.
More campanula portenschlagiana care
Overwintering campanula portenschlagiana — FAQ
Does campanula portenschlagiana need to come indoors for winter?
Campanula portenschlagiana is hardy to roughly USDA zone 4 — winter lows around -34°C. That means it can stay outside all winter in most temperate gardens. Campanula portenschlagiana is properly hardy and overwinters outside without fuss. Tidy away anything dead or diseased, apply a mulch over the crown to steady soil temperatures, and otherwise leave it alone — many hardy plants actually need a cold period to flower and grow well the following year. Save hard pruning for the right season rather than doing it in autumn.
When should I move campanula portenschlagiana for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water campanula portenschlagiana in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills campanula portenschlagiana over winter?
Cutting campanula portenschlagiana hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.