Obviously you have just the right conditions. Of course any plant in their right mind would grow in your garden because you know how to situate it to its best advantage. I promise not to tell it that it is in a zone a bit too cool for it. What a pretty plant. It looks a lot like the penstemon x that gail gave me a start of.
One of my favorite things about blogging is the interaction--posts are often simply the beginning of an interesting conversation! So thanks for taking the time to join the discussion, and please know that I enjoy reading each and every comment left here. I try to answer as many as I can.