Overwintering Bougainvillea in Minnesota

Bougainvillea is a true tropical — no frost tolerance. Overwinter in a south/west window indoors, or force dormancy in a cool (above 30°F), dark basement like geraniums. If dormant: reduce water/light gradually, store dry and dark. Spring: reintroduce light/water slowly. Don't let it bloom during winter — it wastes energy needed for growth.

Cuttings root easily in spring if you want more plants.