Maintaining a lush and weed-free St. Augustine grass lawn requires the best weed and feed solution tailored specifically for this grass type. This article highlights top-performing products that effectively control weeds while feeding your lawn with essential nutrients. Below is a summary table featuring the selected weed and feed products designed for St. Augustine grass care.
| Product | Fertilizer Mix | Weed Control Features | Coverage Area |
|---|---|---|---|
| Fertilome St. Augustine Weed & Feed 15-0-4 | 15-0-4 | Pre- and post-emergent herbicide | Varies by application |
| LESCO 50 lb. St. Augustine Weed and Feed | 17-0-17 | Slow-release nutrient release, penoxsulam herbicide | 13,000 sq ft |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | Not specified (granules) | Kills broadleaf and grassy weeds, 6-month protection | Varies |
| Southern Ag Atrazine St. Augustine Weed Killer | N/A (herbicide only) | Specialized weed killer for St. Augustine and Centipede grasses | 3,720 sq ft per quart |
| Scotts Turf Builder Triple Action | Not specified (granules) | Kills weeds, prevents crabgrass, feeds grass | 4,000 sq ft per pack |
Fertilome St. Augustine Weed & Feed 15-0-4
Fertilome’s product combines both pre-emergent and post-emergent herbicides with a 15-0-4 fertilizer mix to simultaneously control weeds and nourish your lawn. It is specifically formulated for St. Augustine, Centipede, and Zoysia grasses. This makes it effective at preventing weed seeds from germinating while also killing existing weeds. The product should not be used on Bermuda grass or northern grass types. Its dual-action formula helps maintain healthy turf while managing weed threats, making it a reliable choice for Southern lawns.
LESCO 50 lb. St. Augustine Weed and Feed with Penoxsulam
LESCO’s weed and feed product carries a 17-0-17 fertilizer formula with penoxsulam herbicide targeting broadleaf weeds. It is designed to feed your lawn for up to 8 weeks using slow-release technology, including poly-coated and sulfur-coated urea sources. This product covers up to 13,000 square feet and is safe for the Floratam variety of St. Augustine grass. Application requires a wet lawn, with results typically visible within two weeks, supporting robust turf growth while controlling weeds effectively.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
The BioAdvanced 3-in-1 formula is tailored for Southern lawns including St. Augustine and Bermudagrass. It not only feeds the lawn but also kills common broadleaf weeds like dandelion, clover, and dollarweed. This product provides up to six months of weed prevention, effectively stopping new weed growth. The granules promote steady lawn health and vibrant greenery while offering pest control for a cleaner, weed-free yard.
Southern Ag Atrazine St. Augustine Weed Killer 32oz
Southern Ag’s Atrazine is a specialty herbicide designed specifically to treat St. Augustine and Centipede grasses. Unlike combined weed and feed products, this concentrate focuses solely on weed control, treating up to 3,720 square feet per quart. Atrazine controls a broad spectrum of grassy and broadleaf weeds, making it suitable for tough weed infestations on Southern lawns. It can be integrated into a fertilization schedule for comprehensive lawn care.
Scotts Turf Builder Triple Action Weed Killer and Fertilizer
Scotts Turf Builder Triple Action combines three benefits in one product: weed killing, crabgrass prevention, and lawn fertilization. It targets dandelion, clover, dollarweed, and several other common lawn weeds while preventing crabgrass for up to four months. The fertilizer promotes thick, green grass growth. Suitable for St. Augustine grass, this granular formula helps maintain a healthy, resilient lawn all season long.
Buying Guide for Weed and Feed Products for St. Augustine Grass
Grass Type Compatibility
Select weed and feed products that specifically mention compatibility with St. Augustine grass. Some herbicides and fertilizers designed for northern or other southern grasses might damage St. Augustine lawns. Always check product labels for grass type recommendations.
Weed Control Spectrum
Consider products that offer both pre-emergent and post-emergent weed control to prevent future weed seeds from germinating and to eliminate existing weeds. Broadleaf and grassy weed control coverage is ideal for comprehensive protection.
Fertilizer Nutrient Ratios
Look for fertilizer blends tailored to St. Augustine grass needs, typically with higher nitrogen content and balanced potassium. Nitrogen supports green growth, while adequate potassium aids disease resistance and root health.
Application Timing and Method
Some products require application on wet grass or specific weather conditions for optimal results. Read instructions carefully about application timing, watering, and mowing practices to maximize effectiveness.
Duration of Effectiveness
Products with slow-release fertilizers and long-lasting herbicides (up to 6 months) provide extended feeding and weed prevention, reducing the need for frequent treatments.
Environmental and Safety Considerations
Evaluate the safety profiles of herbicides, especially if pets or children use the lawn. Choose products with responsible ingredient formulations and follow usage directions to minimize environmental impacts.
Coverage Area
Calculate your lawn size accurately and buy a product with sufficient coverage to avoid multiple purchases. Some products offer coverage from 3,000 to 13,000 square feet per container.