Premium slow release fertilizers with micro nutrients and iron for enhanced performance. EARLY SPRING - Phase 1- Crabgrass Preventer - Fertilizes and also prevents crabgrass and other grassy weeds for up to 5 months. LATE SPRING - Weed & Feed - Also kills dandelions and other broadleaf weeds on contact. SUMMER - Insect & Feed - Also kills a broad range of damaging lawn insects on contact. FALL - Winterizer - Also contains sulfur to protect and strengthen grass for spring green-up.