In September of 1988, Arnold Arboretum senior research scientist Peter Del Tredici was walking home from a Boston Red Sox game when he noticed what appeared to be a glowing section of growth on a nearby apartment building (as seen here). The mutant strain of Boston Ivy would soon become known as Fenway Park Boston Ivy. After successfully reproducing the mutation in 1989, Peter Del Tredici would go on to gain permission for Fenway Park name usage from Executive Vice President and Counsel for the Boston Red Sox John F. Donovan in 1991. As one of the most popular cultivars of Boston Ivy in landscape use today, Fenway Park is renowned for its often glowing chartreuse leaves depending on sun exposure. According to the Arnold Arboretum, "When grown in full sun, the color comes close to the Royal Horticultural Society (RHS) yellow-green 151A to C; in shade, it is a uniform lime green (RHS 154C to D)." Fall colors are identical to the species. It is important to note that hotter, full sun environments typical of the Southern United States have caused temporary seasonal defoliation in specimens.