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