We have had this one for 3 years and it still is just sitting there in our zone 5a. It may just need a bit more heat, say a Z6. We purchased it from a friend an hour south and in the city, and it was groing well in their garden.
I'm letting it stay, but if I knew this about it, I wouldn't have purchased it. I don't want to wait several years for something to "settle in".
It's beautiful, but I think it would do better in at least a Z6.
