Overwintering Potted Bougainvillea on a Porch

Porch Protection Is Insufficient

Bougainvillea is tropical (Zone 9–11). Even against a house wall, a freeze will kill it. Straw mulch suffocates the actively growing crown.

Required Action

1. Prune back by 1/3 to 1/2 to reduce size.
2. Bring indoors to a sunny window (south/west).
3. Water sparingly; let soil dry 2 inches deep.
4. Return outdoors after last frost.

No Dormancy

Bougainvillea does not go dormant. It needs light and warmth all winter to survive.