I bought a couple of S. purpurea this spring and they've been happy in my little bog garden. I also succumbed to temptation and bought S. x "Judith Hindle" The card that came with it (www.vanbloem.com in MN) says "Hardy zones 6-8" but I've seen some catalogs mention hardy to zone 7. The zone map line dividing Zone 6 and 7 practically runs right through my town so I tend to think of my area as Zone 6.
What is the correct procedure to overwinter "Judith Hindle"? Should I do what I did with the VFT -- wait until the plant goes dormant after a hard freeze, then put the pot in a cooler in the garage? This is what I did last year (for the first time) and despite my trepidations about the blackened foliage, they came through like champs and grew back and some this year.
Since S. purpurea is native to this area, I'm assuming I don't have to do anything -- just leave it out in the garden...
I had a little bonus -- a little tiny sundew started growing in the same pot that one of the S. pupurea is growing in. I accidentally pulled it out, thinking it's a weed/grass, then realized my mistake and tucked it back in. Luckily, there was minimal damage and it's now about 2x as big as when I first discovered it. Now I'm afraid to pull anything else from those pots so there are quite a few weeds growing in there