This is listed as "probably" a hybrid of H. capitata x H. nakaiana which originated with Gus Krossa and was registered by Peter Ruh of Ohio in 1998. The plant grows to about 12 inches in height with a spread of 33 inches. The medium green colored foliage is slightly wavy and slightly rippled at the margins. Medium purple flowers in dense clusters bloom from mid-July into August.
 

"Plant looks much like the species H. nakaiana, but the leaves start out yellowish and turn green."