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