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