I planted 'Emperor Butterfly' on June 17th 2015, it did not bloom this year, so not much to comment about it yet.
Like so many of my new plants this year, it was chosen for rust resistance (1.7) and also like so many of my plants it did show signs of rust this fall as the weather started to cool.
This is what it looks like today, showing some rust, but also still growing and I feel sure it will bloom next spring.
