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