My lucs garcinia survived a hard freeze here west of Orlando. The only protection was a blanket and soil banked around the trunk. White sapote, longans, jabo,lychee, black sapote were protected in a similar manner. Those trees took a hit (and are recovering) but the garcinia was not damaged at all. Just to give you an idea, during this freeze, the sprinklers were turned on the citrus trees and it was cold enough for four inch icicles to form.