Overwintering guide
How to overwinter simple-leaf astilbe
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills simple-leaf astilbe in winter
Cutting simple-leaf astilbe 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 simple-leaf astilbe care
Overwintering simple-leaf astilbe — FAQ
Does simple-leaf astilbe need to come indoors for winter?
Simple-leaf astilbe is hardy to roughly USDA zone 4 — winter lows around -34°C. That means it can stay outside all winter in most temperate gardens. Simple-leaf astilbe 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 simple-leaf astilbe for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water simple-leaf astilbe in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills simple-leaf astilbe over winter?
Cutting simple-leaf astilbe 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.