Overwintering guide
How to overwinter unarmed hedgehog cactus
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 unarmed hedgehog cactus in winter
Bringing unarmed hedgehog cactus 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 unarmed hedgehog cactus care
Overwintering unarmed hedgehog cactus — FAQ
Does unarmed hedgehog cactus need to come indoors for winter?
Unarmed Hedgehog Cactus is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Unarmed Hedgehog Cactus 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 unarmed hedgehog cactus for winter?
Move under cover before the first hard frost; back outside after the last spring frost.
How often should I water unarmed hedgehog cactus in winter?
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
What kills unarmed hedgehog cactus over winter?
Bringing unarmed hedgehog cactus 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.