A hanging basket of white/green variegated Ivy. Nothing exotic (box store purchase), but I would like to keep it for next year. Any clue on how cold hardy they are outside? I don't want to bring it inside before the temperatures start falling below freezing which should be soon, but not just yet. I've taken it down from it's hanger and have it in a pot until I bring it in so it's not high up off the ground.......Maryl