Fairway Formula Spring Fertilizer Weed & Feed and Crabgrass Preventer 24-0-6 kills more than 250 weeds as listed. Prevents crabgrass and destroys it up to 4 weeks after germination. Provides both immediate release and controlled-release nutrients. Continuous feeding for up to 12 weeks. Triple action formula: pre-emergent herbicide; lawn fertilizer; post-emergent broadleaf weed killer.