Sarracenia overwintering

Not sure if these are considered 'tropical' but anyway my question is what to do with them now. I bought a couple on a whim at a Flower Show, they are doing really well sitting in a water feature and still in pots, soon they should stop growing so I've read.

I've seen them growing outdoors all year round at Wisley.

I know they need to be kept moist rather than dry or wet, so I'll move them to the unheated greenhouse, but that gets down to well below zero, say -5C at worse.

Not sure if they will tolerate frost?

 

I don't know much about them but we used to have a member (his GC name was Sarraceniac) and he specialised in them. He also grew tropical. I think he left around 2008.

 

I have them switched off on my preferences so I'm guessing it's a pitcher plant?

Thanks pete, I was told the ones I bought were hardy - I'll find out over winter.

I thought they didn't need much looking after, maybe potting on every couple of years?

 

I remember having seen a photo of Sarraceniac's Sarracenia which were growing happily in the boggy area around his pond. They looked very much like this:-