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