We’ve had ‘Rozanne’ growing in the front garden for a while and this season we’ve added it to two more areas. It blooms freely, has a billowy appearance and spreads nicely on a border. This is a low maintenance beautiful plant and it loves the conditions in our front gardens. I read that if this plant looks like it it suffering from too much hot weather, cutting it back rejuvenates it. However, in our garden we haven’t experienced any difficulty with this plant at all.
27th Street 
I too think of Rozanne as a staple in a garden. Another plus is its long bloom time. I might try cutting one or two of mine back given how everything has suffered with the drought. Conditions here in the Ottawa Valley have been really bad.