Overwintering guide
How to overwinter curly waterweed
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills curly waterweed in winter
Cutting curly waterweed 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 curly waterweed care
Overwintering curly waterweed — FAQ
Does curly waterweed need to come indoors for winter?
Curly Waterweed is hardy to roughly USDA zone 7 — winter lows around -18°C. That means it can stay outside all winter in most temperate gardens. Curly Waterweed 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 curly waterweed for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water curly waterweed in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills curly waterweed over winter?
Cutting curly waterweed 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.