Y'all, I am starting a bonsai Bougainvillea Project. Need some advice and suggestions. I pulled out an old variegated bougainvillea from my front yard and stuck it in a large pot. This was at the beginning of the year. I wanted to see if it survived. It seems to have. This winter I want to start making it smaller and reduce the root ball. It almost fills the pot with about 3/4" new soil all around. There is actually two variety intertwined at the roots with is okay by me but will give a markedly different color leaves. Anyway, I need suggestions when to re-pot and how much to cut back at one time. I am in socal, Z-10A. Mahalo, Aloha