Posted: 07/08/2012 at 09:02
I think they are fully hardy perennials, once they're not tiny baby plants. I'm hoping so anyway, although I don't know exactly what - temperature they are okay up to.
I'm in the south so was probably going to just put them next to the sheltered wall of the house overwinter, like I do my osteospermums, rather than in the greenhouse, so I don't have to worry about watering them. I'd expect them to just disappear below ground as if they were in the ground.
If there is doubt as to their hardiness I could put them in the greenhouse of course. It's unheated in the winter but would offer some protection.