This hybrid of H. 'Sieboldiana' x H. 'Kabitan' was originated by Eric Smith of England and registered on his behalf by Peter and Jean Ruh of Ohio in 2003. It is a large size plant about 20 inches high by 44 inches wide. The foliage is shiny and dark green. Its leaves are elongated, elliptic and slightly rippled. Lavender flowers bloom from late August into September.

According to The Hostapedia by Mark Zilis (2009), "...flowering habits more closely match those of H. longipes. The foliage of 'Hadspen Mystique' shows obvious hybrid characteristics, perhaps between H. longipes and H. 'Sieboldiana'."