Overwintering guide
How to overwinter aster 'purple dome'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills aster 'purple dome' in winter
Cutting aster 'purple dome' 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 aster 'purple dome' care
- Overwintering new england aster — the species this cultivar belongs to
- Full aster 'purple dome' care guide
- Aster 'Purple Dome' temperature range
- How often to water aster 'purple dome'
- How to prune aster 'purple dome'
- Common aster 'purple dome' problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering aster 'purple dome' — FAQ
Does aster 'purple dome' need to come indoors for winter?
Aster 'Purple Dome' is hardy to roughly USDA zone 3 — winter lows around -40°C. That means it can stay outside all winter in most temperate gardens. Aster 'Purple Dome' 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 aster 'purple dome' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water aster 'purple dome' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills aster 'purple dome' over winter?
Cutting aster 'purple dome' 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.