St. Augustine grass thrives with a late-season feeding that supports root growth and prepares the turf for spring green-up. The right winter fertilizer helps repair summer damage, fortifies against cold stress, and targets the unique needs of warm-season grasses common in American lawns. Below are five highly compatible products designed for southern grasses, including St. Augustine, with emphasis on nutrient balance, weed prevention, and convenient application windows. Read on to compare options and find the best fit for your lawn care plan.
| Product | Brand | Coverage |
|---|---|---|
| Scotts Turf Builder WinterGuard Fall Lawn Fertilizer for All Grass Types, 4,000 sq. ft. | Scotts | 4000 sq ft |
| Scotts Turf Builder WinterGuard Fall Weed & Feed3, 5,000 sq. ft. | Scotts | 5000 sq ft |
| Scotts Turf Builder WinterGuard Fall Weed & Feed5, 4,000 sq. ft. | Scotts | 4000 sq ft |
| Ferti-Lome Winterizer And Weed Preventer II For Southern Grasses | VPG | Varies |
| Scotts Turf Builder WinterGuard Fall Lawn Fertilizer for All Grass Types, 12,000 sq. ft. | Scotts | 12000 sq ft |
Scotts Turf Builder WinterGuard Fall Lawn Fertilizer for All Grass Types, 4,000 sq. ft.
Scotts Turf Builder WinterGuard Fall Lawn Food is designed to build strong, deep roots, giving your lawn a solid foundation for spring recovery. The formula supplies essential nutrients to support recovery from summer heat, drought, and activity. It can be applied to wet or dry lawns in the fall, making it a flexible option for seasonal feeding. This product is suitable for all grass types and helps prepare St. Augustine for the transition into winter and spring growth, aiming for a healthier, more resilient lawn.
Scotts Turf Builder WinterGuard Fall Weed & Feed3, Weed Killer Plus Fall Fertilizer, 5,000 sq. ft.
This product combines weed control with fall lawn fertilizer, specifically targeting a broad range of listed weeds while feeding grass for a stronger spring. It kills more than 50 common lawn weeds, including clover and dandelion, and is designed for application when weeds are actively growing and temperatures are between 60°F and 90°F. For St. Augustine, this option helps minimize winter weed competition as the lawn stores nutrients for spring growth. It provides a practical, all-in-one approach for fall lawn care.
Scotts Turf Builder WinterGuard Fall Weed & Feed5, Weed Killer Plus Fall Fertilizer, 4,000 sq. ft.
Scotts Turf Builder WinterGuard Fall Weed & Feed5 combines weed control with fall fertilizer to feed grass while limiting weed competition in the autumn. It targets more than 50 listed lawn weeds, helping St. Augustine lawns start spring with fewer weed challenges. Application is recommended when weeds are actively growing and temperatures stay between 60°F and 90°F, aligning with typical warm-season lawn care windows in many southern regions.
Ferti-Lome Winterizer And Weed Preventer II For Southern Grasses
VPG’s Ferti-Lome Winterizer and Weed Preventer II is tailored for southern grasses, including St. Augustine. It provides essential nutrients for robust lawn health and includes crabgrass control for extended seasonal protection. The formulation supports extended growth cycles and helps reduce weed pressure in late-season applications, delivering a balanced approach to both nutrition and weed management for warm-season lawns in frost-prone regions.
Scotts Turf Builder WinterGuard Fall Lawn Fertilizer for All Grass Types, 12,000 sq. ft.
This larger-format option from Scotts provides broad-spectrum fall nutrition for all grass types, including St. Augustine. It helps promote deep root development and supports spring recovery after weather-related stress. The product is suitable for either wet or dry lawns in fall application, aligning with traditional feeding windows when temperatures are cooler and growth slows, yet nutrient needs remain essential for long-term lawn health.
Scotts Turf Builder WinterGuard Fall Weed & Feed3, 12,000 sq. ft.
This 12,000 sq. ft. version combines weed control with fall lawn fertilizer, designed to control a broad array of listed weeds while feeding the lawn for next spring. It supports St. Augustine by reducing weed pressure as the turf stores nutrients for healthier growth in the coming season, making it a solid choice for larger properties requiring fall treatment.
Buying Guide: Key Purchase Considerations For Winter Fertilizers For St. Augustine
- Grass-type suitability: Look for products labeled for warm-season grasses (St. Augustine, Bahia, Bermuda, Zoysia) to ensure nutrient balance aligns with your lawn’s needs.
- Nitrogen and potassium emphasis: Fall formulas often emphasize slow-release nitrogen and adequate potassium to support root growth and winter hardiness. Avoid high phosphorus doses unless soil tests indicate a need.
- Weed management: If weed control is a priority, select weed-and-feed options that target common fall weeds without harming warm-season grasses. Check temperature guidance (typically 60–90°F) for optimal effectiveness.
- Application timing: Apply in late fall when growth slows but before ground freezes. Some products are formulated for wet or dry lawns, offering flexibility for varying weather patterns.
- Coverage and sizing: Choose a product size that fits your lawn area to minimize waste. For larger yards, bulk options may be more economical, while smaller lawns may benefit from spot treatments.
- Safety and compatibility: Read label instructions regarding pets, children, and irrigation to prevent run-off and ensure safe, effective use.
- Soil conditions: Consider a pre- or post-season soil test to tailor fertilizer choice to specific nutrient deficits or surpluses for optimal results.
This guide consolidates widely compatible winter fertilizers for St. Augustine lawns, emphasizing root development, fall recovery, and weed management. When selecting, weigh lawn size, weed pressure, and regional climate to align with your maintenance schedule and target outcomes for a greener, healthier spring.