Best Weed and Feed Products for St Augustine Grass Lawns 2025
Maintaining a healthy and vibrant St Augustine lawn means effectively controlling weeds while providing essential nutrients. The right weed and feed product will target common broadleaf and grassy weeds while supporting lawn growth. Below is a summary table showcasing the top-rated weed and feed options designed specifically for St Augustine grass.
| Product | Brand | Fertilizer N-P-K Ratio | Weed Control Features | Application Area |
|---|---|---|---|---|
| Fertilome St. Augustine Weed & Feed 15-0-4 | ferti-lome | 15-0-4 | Pre- and post-emergent control on Centipede, Zoysia & St. Augustine | 12.8 lbs bag |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | Not specified | Kills dandelion, dollarweed, clover; 6 months weed prevention | 10 lb granules |
| LESCO 50 lb. St. Augustine Grass Weed and Feed | LESCO | 17-0-17 | Slow release feeding, safe for Floratam variety, wet application | 50 lb bag |
| Southern Ag Atrazine St. Augustine Weed Killer 32oz | Southern Ag | Herbicide only | Controls weeds in St. Augustine and Centipede grasses | 32 oz concentrate |
| Spectracide Weed & Feed 20-0-0 Ready-to-Spray | Spectracide | 20-0-0 | Kills broadleaf weeds while feeding with 20% nitrogen | 32 fl oz spray |
Fertilome St. Augustine Weed & Feed 15-0-4
Fertilome’s St. Augustine Weed & Feed provides both pre-emergent and post-emergent weed control while fertilizing with a 15-0-4 N-P-K blend. This formulation is designed specifically for southern lawns including Centipede, Zoysia, and St. Augustine grasses. It targets common weed species typical to these lawn types without harming the turf. The product is not recommended for Bermuda or northern grasses, so it’s especially suitable for homeowners with St. Augustine.
This granular product helps prevent early weed growth while controlling established ones, aiding in sustained lawn health. The fertilizer formulation also promotes green, healthy turfgrass growth by delivering nitrogen and potassium tailored for southern lawns.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
The BioAdvanced 3-in-1 Weed and Feed is formulated for southern grasses such as Bermudagrass and St. Augustinegrass, including Floratam varieties. It provides up to 6 months of weed protection, making it a convenient option for extended lawn care.
This product combats broadleaf weeds like dandelion, dollarweed, and clover, supporting lawn health with an effective fertilizer blend. Its ability to provide long-term weed prevention combined with fertilizer nutrients helps maintain dense green grass that can naturally resist future weed invasion.
LESCO 50 lb. St. Augustine Grass Weed and Feed
The LESCO 17-0-17 weed and feed comes in a 50 lb bag and is designed specifically for St. Augustine grass. It uses a mixture of poly-coated and sulfur-coated urea, providing a slow release fertilizer lasting up to 8 weeks. This helps ensure consistent nutrient availability and minimizes frequent applications.
This product should be applied when the turf is wet and then allowed to dry, with full results visible within two weeks. It is also safe for Floratam varieties, a popular St. Augustine cultivar, making it a professional-grade choice for southern homeowners.
Southern Ag Atrazine St. Augustine Weed Killer 32oz
Southern Ag Atrazine herbicide is tailored for controlling weeds in St. Augustine and Centipede grasses. While it doesn’t contain fertilizer, it is highly effective in tackling a variety of broadleaf weeds prevalent in southern lawns.
One quart of this product treats around 3,720 square feet, making it suitable for medium-sized lawns seeking specialized weed control. It’s an excellent option when a user needs targeted herbicide treatment alongside separate fertilization routines.
Spectracide Weed & Feed 20-0-0 Ready-to-Spray
The Spectracide Ready-to-Spray Weed & Feed offers a dual-action formula that simultaneously kills major broadleaf weeds and feeds your lawn with a 20% nitrogen fertilizer. It is effective against dandelion, clover, plantain, and several other broadleaf weeds common in St. Augustine lawns.
Its liquid spray form allows for easy and uniform application, delivering nutrients and herbicide directly to your lawn turf and weeds. This product supports fast green-up and weed control with one convenient step.
Buying Guide: How To Choose The Best Weed And Feed For St Augustine Grass
Fertilizer Formulation and Nutrient Ratios
Select a product with an appropriate N-P-K ratio for your lawn’s specific needs. Nitrogen promotes lush green growth, potassium helps with stress tolerance, and phosphorus supports root development. For St. Augustine grass, a balanced or nitrogen-focused fertilizer such as 15-0-4 or 17-0-17 is commonly recommended.
Weed Control Spectrum
Choose products that target the common weeds found in southern lawns, such as dandelion, clover, dollarweed, chickweed, and crabgrass. Some formulations provide both pre-emergent and post-emergent control, offering protection against new and established weeds.
Lawn Type Compatibility
Ensure the product is safe for St. Augustine grass and related southern turf types. Avoid products labeled for northern grasses to prevent lawn damage. Verify if the product supports various St. Augustine varieties, including Floratam.
Application Method and Frequency
Consider whether you prefer granular or liquid formulas. Granular products may require watering in, while ready-to-spray liquids offer convenient application. Some weed and feed solutions provide slow-release feeding over several weeks, reducing application frequency.
Environmental and Safety Considerations
Look for products that minimize runoff risk and allow safe use around children and pets, following label instructions. Always apply herbicides responsibly to protect beneficial plants and soil health.
Turf Health Benefits
Opt for weed and feed combinations that not only kill weeds but also promote deep root growth and lawn resilience, which help the St. Augustine grass thrive under southern climate stressors such as heat and drought.