Prevent Crabgrass with GreenView Crabgrass Control plus Lawn Food with GreenSmart 26-0-4! GreenView Crabgrass Control plus Lawn Food with GreenSmart 26-0-4 helps lawns retain water to protect against heat and drought and speeds root growth to improve nutrient absorption. It feeds your lawn for up to 12 weeks and can be applied in spring to prevent crabgrass all season.