Spread or hydrate & spray. One 40 lb. bag covers 800 square feet of grass seed if using in a granular spreader. Can be mixed with our grass seed for hydroseeding method. Pellet Mulch is an advanced technology granular mulch made from recycled wood and cellulose fibers. Once applied to a seeded area and activated by water, the granules quickly expand and disperse to provide outstanding protection and water-holding performance right where it’s needed—whether you’re spot treating smaller bare spots, or hydrospraying larger areas, it's the easy and convenient way to establish vegetation.