Paul Aden of New York registered this cultivar in 1982 as a hybrid of H. montana 'Aureomarginata' × H. 'Big Sam'. This giant size (37 inches high) plant has deeply lobed, slightly rippled leaves that come to a thin tip. It has pale lavender flowers.

According to The Hostapedia by Mark Zilis (2009), "Over the years, there has been some debate about the difference between 'Mikado', H. montana macrophylla, and other similar cultivars. Whatever the case, 'Mikado' and the others all make worthy additions to any shade garden."