‘;UF15-20-6’; is a new Coleus plant with novel characteristics that include excellent heat tolerance, distinct, highly lobed leaves that display a unique and consistent green, pink, and white coloration pattern, and a vigorous, compact upright growth habit and excellent lateral branching. ‘;UF15-20-6’; exhibits superior foliage color stability when grown under all conditions, including both sun and shade conditions. Further, ‘;UF15-20-6’; exhibits long-season performance until late fall.