It is interesting that the American and Japanese hybrid peonies are the most robust here. The suffructicosa advanced generation hybrids are the best of all. Tree peony hybrids that will bloom here. But in general I find as you do that they tend to be a bit of a prima donna. Although to be fair some of the research places in Canada and our northern states have bred some really hardy plants of all sorts especially roses like the Buck and Park roses.
