Overwintering guide
How to overwinter canna 'roi humbert'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills canna 'roi humbert' in winter
Cutting canna 'roi humbert' 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 canna 'roi humbert' care
Overwintering canna 'roi humbert' — FAQ
Does canna 'roi humbert' need to come indoors for winter?
Canna 'Roi Humbert' is hardy to roughly USDA zone 7 — winter lows around -18°C. That means it can stay outside all winter in most temperate gardens. Canna 'Roi Humbert' 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 canna 'roi humbert' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water canna 'roi humbert' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills canna 'roi humbert' over winter?
Cutting canna 'roi humbert' 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.