What a good find this plant was/is. It sure can cover a lot of ground as it grows every year. And the flowers are a nice addition to bouquets. It is sturdy no matter how cold a winter we have, or how much water it gets in the summer. Those are the minimum conditions for survival in my yard.
This mother plant is within a deer fence, but where it expanded outside the fence it was not bothered by animals. Therefore, it seemed to me, a likely candidate to experiment and move a baby plant outside of the enclosure. Not a great idea, as it turned out. Now, this former baby has its own small fence around it, and the deer prune any parts that try to escape protection.