Overwintering guide
How to overwinter double king cup
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills double king cup in winter
Cutting double king cup 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 double king cup care
Overwintering double king cup — FAQ
Does double king cup need to come indoors for winter?
Double King Cup is hardy to roughly USDA zone 3 — winter lows around -40°C. That means it can stay outside all winter in most temperate gardens. Double King Cup 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 double king cup for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water double king cup in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills double king cup over winter?
Cutting double king cup 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.