Just bought a myrtus apiculata to grow up against a south facing fence. The garden centre sold it to me as hardy but since getting home I've read conflicting comments about its hardiness. I live in Wales UK where the climate is fairly mild in the winter and my back garden where this plant is is a sun trap and gets very warm in the summer. I am also growing an Abelia there (against a wall, facing south west) and that is thriving (it has grown from a tiny plant to about 1.6-1.8m in about a year and a half). Abelia seems to be quoted the same hardiness as the myrtle but having said that last winter was especially mild in Britain. Will the myrtle survive in my garden?