I've had Mighty Chestnut for at least 7 years... It does very well, tons of blooms and extended blooming. It has multiplied very well even in 5a (although, been closer to 4a for several of the winters it's been through.... last winter we were colder than Alaska several times ). So great recommendation for Northern gardeners. Beautiful color, not at all brownish like the AHS photo.
I'm dividing again this year if anyone is interested.
). So great recommendation for Northern gardeners. Beautiful color, not at all brownish like the AHS photo. 
