Hans Hansen of Minnesota registered this sport of H. 'Squash Casserole' in 2005. It varies from the mother plant by having a green marginal variegation. 'Yesterday's Memories' forms a large size (19 inches high x 42 inches wide) mound with leaves that are are oblong-ovate with deep veins, average substance and an unruly growth habit. Medium purple flowers bloom in July on scapes about 22 inches high.

According to The Hostapedia by Mark Zilis (2009), "How can success be insured when developing a new cultivar? Well, start with a proven mother plant, add a bit of variegation, and voila!, an instant winner. I'm not sure if Hans Hansen looks at things that way, but 'Yesterday's Memories' certainly possesses all of the good traits of 'Squash Casserole' (e.g. rippling, a good growth rate, and great durability) and adds an attractive green margin."

Among other things, this was a song by Eddy Arnold.