Green-Up Lawn Food with Crabgrass Preventer is the first application in Jonathan Green's New American Lawn 4-Bag Annual Program, the ONLY one on the market that feeds the lawn...AND THE SOIL®! The New American Lawn feeds lawns with slow-release lawn fertilizers, controls weeds with superior herbicides, and enhances sub-soil with a unique "soil" fertilizer called Mag-I-Cal Plus. Mag-I-Cal Plus, the third step of the program, adjusts soil pH, loosens hard soil, and bio-stimulates the soil microbial life. It's simple. Healthy soil is the foundation for healthy lawns...and the New American Lawn 4-Bag Program, unlike all others, makes this happen!