Overwintering guide
How to overwinter allium 'mount everest'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills allium 'mount everest' in winter
Cutting allium 'mount everest' 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 allium 'mount everest' care
Overwintering allium 'mount everest' — FAQ
Does allium 'mount everest' need to come indoors for winter?
Allium 'Mount Everest' is hardy to roughly USDA zone 5 — winter lows around -29°C. That means it can stay outside all winter in most temperate gardens. Allium 'Mount Everest' 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 allium 'mount everest' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water allium 'mount everest' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills allium 'mount everest' over winter?
Cutting allium 'mount everest' 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.