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