This non-registered cultivar which is a sport of H. 'Moonlight' originated by Frank Riehl of Iowa. It forms a large size (20 inches high by 50 inches wide) plant with foliage that is slightly corrugated, generally flat and of average substance. It bears pale lavender flowers from late July into August but does not form seed pods. This is a 'Fortunei' type hosta.

According to The Hostapedia by Mark Zilis (2009), "...We know now that 'Lunacy' is infected with Hosta Virus X and was one of the first "cultivars" named for this trait...symptoms vary from plant to plant...If you own a plant of 'Lunacy', please destroy it."