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