Ike's 114020 7.5 oz Crabgrass and Weed Killer for Landscaping is a selective, post-emergent herbicide that can be safely applied to many types of turf. This formula works by controlling a variety of broadleaf and grassy weeds, such as crabgrass. It can be applied to both residential and non-residential turf, in periods ranging from 7 days before seeding up to 28 days after emergence on selected weeds.