The color in the photograph is just about right. This is another plant from Asiatica; it came in last week. We'll keep them in containers for the winter and plant them out next spring. Maybe I'll divide them next spring. I potted the ~4" pots to 300's and the roots were straining at the edges of the smaller pots.
I don't know much about it except that the color is spectacular and it blooms late in the season. Both big plusses in my mind. I'm sure it's an easy plant, hey, it's an Aster! Barry notes that the flowers are quite frost resistant, a useful trait for a plant that flowers this late.