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