A large size hosta, this non-registered cultivar is a sport of H. 'Frances Williams' originated by Royall Bemis of Blackthorne Gardens in Massachusetts. It is of the H. 'Sieboldiana'-type with gold colored foliage.

According to The Hostapedia by Mark Zilis (2009), "...synonymous with...'Golden Sunburst'. The name 'Golden Mammoth' predates 'Golden Sunburst'..."