Gary, I wouldn't risk it - we found one in our greenhouse when we took over our current plot, didn't realise it was still alive so stuck it outside where it did nothing until a month ago. I put it back in the greenhouse and it's grown loads and has some grapelings on it now. I've read in other forums about folk trying to grow vines outside in the north of England and only ever ending up with tiny sour grapes that were only good for the birds. I suppose it depends who you want feed, you or the pigeons...