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