Anyone grow this tree or know anything about it? I found one at my favorite nursery. It's a decent size (7 gallon). I'm in love with the pics of the flowers. I am so tempted to buy it but I'm worried it won't survive in my zone 6 (on the a/b line). I've read that it is borderline hardy for zone 6. There's only 1 available at the store and from what I'm reading its rare. Its just that I am worried about throwing $$ away and killing such a beautiful tree. Does it have a pretty mature shape to match the flowers? Should I risk it?