Will the weeping, fruiting mulberry tree that I have seen thriving further South do well on Vancouver Island, coastal regions, elevation <500 ft, southeast coast (Nanaimo region)? Is it considered an invasive alien? is there any reason not to plant one? how cold-hardy is it (would this last winter, with many nights below -3C, have killed one)? I covet the fruit and the elegant form of the tree but am nervous about spending big bucks on a fairly mature young tree (I have a shot at purchasing one about 6 ft tall) if it will not thrive.