Overwintering guide
How to overwinter diablo orange cosmos
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 diablo orange cosmos in winter
Bringing diablo orange cosmos 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 diablo orange cosmos care
- Overwintering sulphur cosmos — the species this cultivar belongs to
- Full diablo orange cosmos care guide
- Diablo Orange Cosmos temperature range
- How often to water diablo orange cosmos
- How to prune diablo orange cosmos
- Common diablo orange cosmos problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering diablo orange cosmos — FAQ
Does diablo orange cosmos need to come indoors for winter?
Diablo Orange Cosmos is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Diablo Orange Cosmos 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 diablo orange cosmos for winter?
Move under cover before the first hard frost; back outside after the last spring frost.
How often should I water diablo orange cosmos in winter?
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
What kills diablo orange cosmos over winter?
Bringing diablo orange cosmos 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.