Good idea Dave! People can still try them if they want to, in a very hot year as we had in 2006 they did quite well and we had a mild winter to follow but the summer of 2007 was dreadful. One day in mid July only reached 12C!! That's just under 54F!
Tee, the trouble is USDA zones tend to be used here too, although there is a different system that isn't known so well.
