Overwintering guide
How to overwinter kidney maidenhair fern
Winter watering
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
The mistake that kills kidney maidenhair fern in winter
Bringing kidney maidenhair fern into a warm living room. Too much winter warmth forces weak, pale growth that collapses when it goes back outside — cool and bright beats warm and dim.
More kidney maidenhair fern care
Overwintering kidney maidenhair fern — FAQ
Does kidney maidenhair fern need to come indoors for winter?
Kidney Maidenhair Fern is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Kidney Maidenhair Fern will take cool conditions but not a hard freeze, so the aim is a frost-free winter rather than a warm one. An unheated greenhouse, porch, conservatory or bright garage all work well. Keep it cool, bright and on the dry side, and it will hold steady until growth restarts in spring.
When should I move kidney maidenhair fern for winter?
Move under cover before the first hard frost; back outside after the last spring frost.
How often should I water kidney maidenhair fern in winter?
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
What kills kidney maidenhair fern over winter?
Bringing kidney maidenhair fern into a warm living room. Too much winter warmth forces weak, pale growth that collapses when it goes back outside — cool and bright beats warm and dim.