Mayo - The flowers are called prisms because of the elongated triangular eyezone.
Betty - That photo of Picotee Prism is marvelous. I think that one is calling my name. Do you have that one. And, if so, how does it perform for you? Also, what makes Amethyst Prism your favorite. I got that one because it was the largest at that time. I got it as a single fan this year, but it has already divided into three fans. I just hope it will be hardy here.
Debra