steppable
n.— «In many instances, consumers are a step ahead of the market. Elaine Morgan, 64, said she was researching drought-resistant plants and “steppables,” low ground cover which requires less maintenance and water than grass but can stand to be trod upon, for her home in Duluth, an Atlanta suburb.» —“Feeling Warmth, Subtropical Plants Move North” by Shaila Dewan in Atlanta, Georgia New York Times May 3, 2007. (source: Double-Tongued Dictionary)