Visitors always ask about the large Astilbe look a like plant in the back of one of our borders. It is Persicaria polymorpha, commonly called Giant Fleece Flower. We've been a little cautious offering plants from this genus, as some members are notorious invaders. However, this species forms clumps and does not run. It does become a huge plant…. 6' + all and wide, so it is a subject that can be viewed well from some distance.
Grow Persicaria in full sun or partial shade, in average to moist soil. It has proven amazingly drought tolerant once established.