I've seen quite a few citrus trees in Charleston. Lazz has four or five citrus trees growing outside at his home in North Charleston. There is a lady with a large grapefruit tree in her back yard in Charleston that I know of, and Citrus Joe and I picked mandarins off of another tree in Charleston. SouthCal2warm, I don't think growing a tree on it own roots, instead of various other rootstocks, necessarily makes a citrus more cold hardy..