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