I have read both they can survive here and can't survive here...........but I did have some in my bog, brand new baby plants that came back from a solid freeze last winter. So they should be ok. I tend to let plants be, plant what should live and if doesn't move on to something else. There are a few pond plants I will baby, lol, but that is it.
The pitcher has water in it, or it is dry, the bug crawls in and can't get out, downward pointing hairs. Those sundews are sticky, the gnats come in for the honey and get stuck to them. They are covered with gnats! natural gnat control
I have not seen him on line here or elsewhere in a while, hope all is ok