I have HEAT -- and it's supposed to go up to 110 this weekend! Our winters are not that cold anymore, and NORTH WIND DANCER is a dormant so it needs colder winters. Some winters it never gets down to freezing here, but my sis lives 20 miles away in the foothills and she gets down to freezing a few times each winter. Jim Murphy told me once that he didn't think dormants would do well for me because it doesn't get cold enough here, and each year the blooms would get smaller, etc. And I think that's what's happening. Since you're in Minnesota I think yours will do just fine!