Brocaded gown has done well here also, but I have only had it since July 2015. It bloomed for about two months here. I think it pretty well met the stats of 26x6 in my garden. Just went down to the garden, and Brocaded Gown only has four fans, not sure but I think I started with two, so not a rapid multiplier, but at least not decreasing.
This is a photo of Brocaded Gown I just took, it was loaded with aphids when I pulled off most of the dead foliage, by the time I got back two Ladybugs were feeding on them. Only one shows in the photo.