Purchased this plant the year it came out and planted it in my first garden. Im a zone 5/6, depending who ya talk to in Ohio, and it has come back each year. Takes a while to get out of the ground but when it does its quick to get going and start blooming at a foot tall. We recently moved and when I started my garden again I bought 5 new plants and again...they come back.
I place these in full sun areas that are a little more on the dry side and they are so impressive not needing any fertilizers. Wont have a garden without them!