Posted: 09/10/2015 at 14:32
It depends how exposed your garden is. For my garden, I'd keep them in a cold frame or greenhouse and plant out in spring when the worst frosts are over. In a sheltered garden that doesn't get heavy frosts or too much winter wet, they're probably OK to be planted out.
Either way, they're a slug magnet in my garden so be ready with the wildlife friendly pellets from about St Valentine's Day when they start to emerge form hibernation or hatch from eggs and start munching on your treasures..