This came up in my earlier post, but I wanted to bring it to the front. Am I correct that all hosta are hardy to zone 3? Are there any warm weather hosta I need to avoid? I do not seem to find specific zone ratings on each different hosta type. I have only found a general label in the deffinition of a hosta. I live in central MN. Some say we are zn 4, an old boss of mine, owner of a commercial green house, laughed at this and told me we were absolutely zone 3. I have had several types of zn 4 plants die on me. Winters like this one with little or no snow cover do not help the zone 4 plants. What is the deal on zones for hosta.