A cross between H. 'Mira' × H. 'Sieboldiana', this cultivar was registered by Clarence Owens of Michigan in 1990. It produces a giant size (29 inches high) mound of heavily corrugated foliage with thick substance. White flowers appear in July.

According to The Hostapedia by Mark Zilis (2009), "At the 1999 National Convention of The American Hosta Society in Michigan, Clarence Owens' specimen of 'Blackjack' was a true standout. The large size mound of unruly, bluish green foliage was absolutely sensational on that late June day."