Best Weed and Feed Fertilizer for St Augustine Grass to Control Weeds and Nourish Lawn 2025
Maintaining a healthy and lush St. Augustine grass lawn requires effective weed control and proper fertilization. Choosing the best weed and feed fertilizer for St. Augustine grass ensures your lawn receives essential nutrients while preventing and eliminating broadleaf and grassy weeds. Below is a comparison table that summarizes the top products suited for this grass type, followed by detailed reviews to guide your selection.
| Product Name | Key Features | Weight / Coverage | Suitable For |
|---|---|---|---|
| Fertilome St. Augustine Weed & Feed | Pre and post-emergent herbicide, 15-0-4 fertilizer | 12.8 lbs | St. Augustine, Centipede, Zoysia grass |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | 6-month weed protection, kills dandelion, crabgrass | 10 lbs | Southern lawns including St. Augustine, Bermudagrass |
| LESCO St. Augustine Grass Weed and Feed with Penoxsulam | Slow release fertilizer, 30% coated urea, safe for Floratam | 50 lbs | St. Augustine grass including Floratam |
| Scotts Turf Builder Lawn Food | Strengthens roots, improves nutrient absorption | 12.5 lbs | All grass types including St. Augustine |
| Scotts Green Max Lawn Food with Iron Supplement | Fast greening with 5% iron, dual-action formula | 16.67 lbs | All grass types |
Fertilome St. Augustine Weed & Feed 15-0-4 (12.8 lbs.)
Fertilome (13915) Weed & Feed is designed specifically to nourish and protect St. Augustine grass alongside Centipede and Zoysia lawns. Its 15-0-4 fertilizer mix delivers nitrogen and potassium without phosphorus, ideal for maintaining healthy turf without promoting excess thatching. This product offers both pre-emergent and post-emergent herbicide action, controlling a wide range of weeds effectively. However, it is important to avoid usage on Bermuda grass or northern grass types, as it is formulated for southern warm-season grasses. Regular application during active growing seasons will help keep lawns vibrant and weed-free.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns, Granules
BioAdvanced offers a specialized formula for Southern lawns including St. Augustine and Bermudagrass. It provides up to 6 months of weed prevention, targeting broadleaf and grassy weeds like crabgrass, dandelion, and clover. Its granule form makes it easy to apply, feeding the lawn while controlling weeds simultaneously. This product is suited for those wanting long-lasting protection with fewer applications throughout the growing season. The combination of nutrient feeding and effective weed control helps maintain a uniform, green lawn.
LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam
LESCO’s weed and feed fertilizer features a strong 17-0-17 NPK ratio with 30% poly coated sulfur coated urea, providing slow-release nutrients for up to 8 weeks. It is particularly suited for St. Augustine grass including the Floratam variety. Application when the turf is wet ensures nutrient absorption, with full effects visible within two weeks. This professional-grade fertilizer supports vigorous growth while controlling weeds, balancing fast and long-term feeding for robust lawn health.
Scotts Turf Builder Lawn Food – Fertilizer for All Grass Types
Scotts Turf Builder Lawn Food strengthens grass via deep root nourishment and improves water and nutrient uptake. Its formula is effective for all grass types, including St. Augustine, promoting resilience and density without specifically targeting weeds. This lawn fertilizer is suitable for maintaining overall turf health throughout the growing season. Its flexibility of application on wet or dry lawns allows convenient use in various conditions, supporting steady growth and stress resistance.
Scotts Green Max Lawn Food with Iron Supplement for Greener Grass
Scotts Green Max combines a dual-action fertilizer with a 5% iron supplement to deliver quick greening effects within three days. It feeds turfgrass deeply and improves color while supporting any grass type. This product is ideal for enhancing lawn aesthetics with rapid results and can be applied during spring, summer, or fall. Although its primary focus is fertilization rather than weed control, its nutrient-rich formula boosts overall lawn vigor.
Buying Guide for Best Weed and Feed Fertilizer for St Augustine Grass
Choosing the right weed and feed fertilizer for St. Augustine grass depends on several factors:
- Weed Control Range: Select products that target broadleaf weeds common in your lawn, such as dandelions and clover, while safe for your grass variety.
- Fertilizer Nutrient Ratio: A balanced NPK ratio suited for warm-season grasses promotes healthy growth. Avoid excessive phosphorus as St. Augustine grass generally needs less.
- Pre-Emergent vs. Post-Emergent: Pre-emergent herbicides prevent weed seeds from germinating, whereas post-emergents kill existing weeds. Many weed and feed products feature both but check to match your lawn needs.
- Grass Type Compatibility: Some products are designed exclusively for southern warm-season grasses, so confirm compatibility with St. Augustine and avoid use on Bermuda or northern grasses if contraindicated.
- Application Timing and Conditions: Follow guidelines about applying on wet or dry grass and seasonal timing to maximize fertilizer absorption and weed control efficacy.
- Product Form: Granular formulations offer ease of spread, while liquid concentrates can provide quicker results but may require equipment for application.
- Longevity and Release: Slow-release fertilizers extend feeding duration, reducing application frequency and promoting steady growth.
- Additional Benefits: Some fertilizers include iron supplements for deep greening or dual-action weed killers that simplify lawn care.
Evaluating these considerations will help select the best weed and feed fertilizer tailored to maintain and enhance your St. Augustine lawn, balancing nutrient support with effective weed management for a lush, green, and healthy yard.