Lawns are generally composed only of grass species, subject to weed and pest control, maintained in green colour, and are regularly maintained to ensure an acceptable length. Lawns are used around, apartments, houses, commercial buildings and offices. Approximately 80% of all homes in the United States have grass lawns. This has resulted in a $40 billion per year industry, with American grass lawns using more water than is used to grow all the wheat and corn in the United States.  In that sense, by water consumption, grass is the United States’ leading “crop” by far, with the Environmental Protection Agency estimating that about 1/3 of all public water is used to water grass, with that number rising as high as 70% in some of the more dry regions of the United States.