Johnathan Green Crabgrass preventer plus New Seeding Lawn Fertilizer prevents the growth of crabgrass and also grassy weeds. You can apply the fertilizer the same day as you seed your lawn without injuring any seedlings. It feeds the new seedlings efficiently with the 20 percent controlled nitrogen release. Product provides iron for deep greening with quick results. Used for lawn repair and establishing green lawns from seeds or sod.