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