Paige, in one respect this is encouraging; but in another respect it's confusing: how is it that they would not freeze in zone 6? Did you mean that the deeply planted corms/tubers (more about this in a separate post) do not freeze? Surely the foliage freezes repeatedly in a normal winter? This repeated freezing and thawing of the foliage is a big problem here: plants subjected to these conditions become weaker yearly until they are gone for good. Also, the frozen foliage is very prone to mechanical damage. I'm going to try a piece of my plant in the open garden eventually. Jim McKenney