I've had Bluegrass Shadows since May 2021. ( two seasons) It has steadfastly remained at 3 fans , not gaining or losing any. It has rebloomed both years, originally blooming in June then again mid way through August. The first year, the rebloom happened in September, I had one bloom, then we got a light frost and all the buds fell off. So, the flower itself doesn't like the cold, even though the plant seems to be hardy. Mine has also remained short so far, only about 24".
However, the flower is beautiful, so hoping for more action next year