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