Weeds are plants out of place. A characteristic of weeds is that they compete with other desirable plants (or your grass) for available water and nutrients, which usually results in thinning, and unsightly patches on your lawn. Weeds detract from the beauty of lawns due to the contrast in color and texture between the desired grass plants and the weeds. Weed control is the botanical component of pest control. Feed Ur Lawn uses a selective herbicide which targets the weeds while leaving any other plants or grass relatively unharmed.