Overwintering guide
How to overwinter bluebird mountain hydrangea
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills bluebird mountain hydrangea in winter
Cutting bluebird mountain hydrangea 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 bluebird mountain hydrangea care
Overwintering bluebird mountain hydrangea — FAQ
Does bluebird mountain hydrangea need to come indoors for winter?
Bluebird Mountain Hydrangea is hardy to roughly USDA zone 6 — winter lows around -23°C. That means it can stay outside all winter in most temperate gardens. Bluebird Mountain Hydrangea 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 bluebird mountain hydrangea for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water bluebird mountain hydrangea in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills bluebird mountain hydrangea over winter?
Cutting bluebird mountain hydrangea 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.