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