Teresa, I grow all three foliage types. I have had only a few problems with loss and all of it with fall added plants. I had terrible luck trying to overwinter in pots last year but I didn't have that problem this year - learned a bit and moved forward.
We typically have enough snow cover to protect all but the most tender plants and anything I am really concerned about comes indoors until I have enough that I can test a fan or 2 outside. I'm listed as 5b and have been as cold as -20 in the time I have lived here but I've managed to overwinter Gerbera daisies and gladiolus as well.
