Hi All, I bought two large Bougainvillea plants in March and planted them in ground front of the house. The plants are doing well foliage wise, there hasn't been much blooming but I only recently found out they only bloom on new growth (hadn't been pruning them yet).

My question is what's the best way to winter these plants. Being they are in the ground I don't have the option to bring them inside. The two plants are bushes around 4'x4'x4'

Any help wintering these plants would be appreciated.

Thanks!