Overwintering Bougainvillea Indoors: Dormancy Protocol for Cool, Bright Conditions

Bougainvillea Winter Care: Force Dormancy, Don't Force Growth

The key to overwintering bougainvillea is accepting it WON'T look good indoors. You're preserving the root system for next summer's glory.

Indoor Dormancy Protocol

• Temperature: 40-60°F (cool basement, unheated sunroom, garage above freezing)
• Light: Bright as possible. South window + 4 hrs grow light supplement
• Water: Minimal. Only prevent total root desiccation. Every 3-4 weeks.
• Pruning: December/January. Cut back by 1/3. Remove dead wood.
• Repotting: Same time if needed. Don't upsize dramatically.
• Humidity: Pebble trays, but no wet feet
• Leaf drop: EXPECT IT. It's normal. Don't panic-water.

Spring Transition

1. When nights >50°F, move to shade outdoors
2. Gradually increase sun over 2 weeks
3. Resume regular water/fertilizer
4. New growth = success

Reality Check

Indoor bougainvillea gets spider mites, drops leaves, looks pathetic. But a healthy root crown in spring = explosive summer bloom. That's the trade.