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