Frost Damaged Bougainvillea

Question

In southern California, when do I trim the frost damaged branches from my Bougainvillea? New growth is appearing.

Answer 1

I would wait until spring to cut back the plant. It will help protect the new growth, just in case another freeze occurs. These articles will help you:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm