This application will help to prevent the invasion of the most commonly know weed in the area…… Crabgrass. Crabgrass can take over the within a couple months if not properly cared for. As the crabgrass starts to mature it becomes harder and harder to control and kill. A well timed application of pre emergent and a good nutrient rich fertilizer can give you the season long control you are looking for. On most lawn and will usually take 1 to 3 year to get full control of crabgrass.