Expert Gardener Lawn Starter Lawn Food, 24-25-4 Fertilizer 3 lb., is specially formulated lawn food for starting new lawns from seed or sod. The high phosphorus level promotes strong root development and winter hardiness. Expert Gardener Lawn Starter may be used anytime during the growing season. For best results when planting a new lawn or over-seeding an existing lawn, apply in the spring or fall, when temperatures are above 50˚F and below 90˚F. You may water in the product any time after application, closely following the watering instructions of your grass seed or sod. 3lb bag covers up to 1,000 square feet.