Tall grass and weeds taller than 18 inches are a public nuisance because of their potential health hazards rather than their appearance. Grass and weeds grow where people have cleared or cultivated land. Thick growths provide food and shelter for mosquitoes, ticks, flies, mice and rats. Perenials such as bahalgrass, bermudagrass, bluegrass, broomsedge, dandellon dogfenel etc. Affected areas include airport runways, railroads, and highways, pipeline right off ways, lumberyards, industrial plant sites etc.