I'm thinking of getting a mini bog setup with some temperate species since I have a S. purpurea currently residing in a terrarium already. So I plan on moving that in there as well as some North American dews. So far it seems as if rotundifolia and filiformis are good candidates and I've seen conflicting info on whether intermedia would work. Also, would the tracyi subspecies of filiformis work or would I want just the typical form? I can't find specifics on its cold tolerance.
I'm specifically going to be overwintering them in the UP of Michigan. Supposedly zone 5 since winters are a bit more mild in terms of temp (reaches below 0F maybe once or twice a season) than some of the surrounding southern areas but we usually get a lot more snow (200+").
Any ideas on what would and wouldn't work? General pointers are always appreciated as well!