This is a grassy weed that is controlled well with a spring application of Green-Up Lawn Food with Crabgrass Preventer. If you have had crabgrass trouble in the past, add an application of Crabgrass and Weed Preventer in early June. Crabgrass will turn somewhat purple, then brown and die after the first frost. It is an annual plant but produces many seeds that will germinate the following spring.