I've never grown fuchsias before but someone bought me 3 large plants for my birthday in July. They have flowered their socks off, and I am now a big fan. I've had them in large pots on the patio, and wondered if I can leave them like that through the winter. I should say that they were all labelled as hardy: Tom Thumb, Genii, and Delta's Sarah. I would hate to lose them. Would a cold greenhouse be enough protection or should I find spaces in the borders?