Designed for New Lawns & Overseeding – Ideal for starting fresh seed, laying sod, or overseeding thin patches. Encourages germination and deep root growth with a proven 15-20-10 NPK ratio. Includes slow-release XCU nitrogen, ammonium sulfate, iron, and essential micronutrients for steady feeding, early color, and long-lasting growth. Less fillers—more nutrient-dense lawn food. Safe for Seed & Sod: Formulated to be gentle on new seedlings while providing the nutrients they need most. Ideal for new lawn installs, fall overseeding, and spring repairs. Clean, Easy-to-Spread Prill: High-quality granules ensure smooth flow through spreaders and even coverage across the lawn. Professional results made simple for homeowners. 🇺🇸 Professional-Grade Quality, Only from Lawn Synergy – Our proprietary starter blend is used by lawn care pros but only available to homeowners here. Not sold in big box stores. Provides Faster Germination and Seed Development Give your new lawn the best possible start with Lawn Synergy’s 15-20-10 Starter Fertilizer. Designed by lawn industry pros Tony & Peter, this premium, high-phosphorus formula helps new grass root faster, grow stronger, and establish quickly. Whether you're laying sod, overseeding, or repairing nutrient-deficient areas, this starter fertilizer delivers the nutrients your lawn needs without fillers or gimmicks. Each bag is packed with high-quality ingredients including slow-release XCU nitrogen, ammonium sulfate, iron, and a complete micronutrient package. These nutrients work together to provide steady feeding, deep green color, and improved early development—all while staying safe for new seed. Our clean, uniform prill spreads easily with any broadcast spreader and gives you even coverage every time. Apply at the recommended 5 lbs per 1,000 sq ft for best results. Family-owned, USA-made, and shipped fast, Lawn Synergy keeps quality high and fillers low so every pound works harder for your lawn.