Best Weed and Feed for St Augustine Lawns: Top Picks for 2026
The St. Augustine lawn needs a careful balance of weed control and feeding to stay lush and healthy. The products below target common St. Augustine pests while providing essential nutrients to promote thick, green growth. Each option in this guide is suitable for St. Augustine grasses, including Floratam variants, and helps manage crabgrass, dandelion, dollarweed, and other typical weeds. The selections emphasize safe use, effectiveness, and coverage to fit American yard sizes and seasonal needs.
| Product | Brand | Coverage | Notes |
|---|---|---|---|
| Fertilome St. Augustine Weed & Feed 15-0-4 | Ferti-Lome | 25.6 lbs bag (typical coverage varies) | Pre-emergent and post-emergent weed control; tailored for Centipede, Zoysia, and St. Augustine |
| BioAdvanced 3-in-1 Weed And Feed Southern Lawns (10 lb) | BioAdvanced | 10 lb granules | Weed prevention up to 6 months; targets broadleaf and grassy weeds |
| Southern Ag Atrazine St. Augustine Weed Killer (1 gallon) | Southern Ag | 1 gallon | Controls many broadleaf weeds; suppression of crabgrass |
| LESCO 50 lb St. Augustine Grass Weed And Feed | LESCO | 50 lb bag | Specially formulated for St. Augustine; slow release |
| Sunniland St. Augustine Weed & Feed Lawn Fertilizer (5000 sq ft) | Generic | 5000 sq ft | Easy to spread; two applications per year |
Fertilome St. Augustine Weed & Feed 15-0-4
Ferti-Lome’s product combines weed control with a balanced 15-0-4 fertilizer blend. It is designed for Centipede, Zoysia, and St. Augustine lawns, delivering targeted care to suppress both pre-emergent and post-emergent weeds while providing steady nutrients. It should not be used on Bermuda or other Northern grasses, highlighting the need to match products to your specific lawn type and climate. This formulation emphasizes compatibility with St. Augustine seedings and established turf, supporting early-season green-up and weed management.
BioAdvanced 3-in-1 Weed And Feed Southern Lawns (10 lb)
BioAdvanced’s 3-in-1 formula targets Southern lawns that include St. Augustinegrass, with up to six months of weed-prevention protection. It acts as both a lawn fertilizer and a weed killer, addressing listed broadleaf and grassy weeds such as crabgrass, dandelion, and dollarweed. This product provides a broad-spectrum approach suitable for homeowners seeking longer-lasting weed control alongside steady nutrition for St. Augustine turf. Its formulation emphasizes compatibility with Floratam varieties and similar southern grasses, aligning with regional lawn care practices.
Southern Ag Atrazine St. Augustine Weed Killer (1 gallon)
This Atrazine-based product from Southern Ag provides weed suppression in St. Augustine and centipede grasses. It targets a broad range of broadleaf weeds and helps suppress crabgrass, supporting seasonal weed management in warm-season lawns. Atrazine formulations are often valued for their speed and effectiveness; however, users should follow label directions and local regulations to ensure safe and legal use, particularly on treated turf areas and near non-target plants. This option adds flexibility for gardeners seeking a straightforward weed-control solution for St. Augustine lawns.
Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz
Another Atrazine-based option from Southern Ag, this quart-sized containment treats up to 3,720 square feet. It targets weeds in St. Augustine and Centipede grasses and is marketed with a straightforward application pathway. The product emphasizes practicality for homeowners managing medium-sized lawns and wanting a reliable herbicide that works with warm-season turf. While effective for weed suppression, users should adhere to the label for rate and timing to protect desirable grasses and avoid runoff or unintended damage.
LESCO 50 lb St. Augustine Grass Weed And Feed
LESCO’s bulk option is built for professional-grade performance with a slow-release profile designed to feed St. Augustine turf for up to eight weeks. The formulation includes a 17-0-17 ratio and a combination of coated urea for steady feeding. It’s described as safe for Floratam varieties and is intended for use when the turf is wet, allowing a thorough uptake of nutrients and weed-control agents. This product suits larger yards or professionals seeking robust coverage and longer-lasting results between applications.
Sunniland St. Augustine Weed & Feed Lawn Fertilizer (5000 sq ft)
This Sunniland product emphasizes ease of use with simple granules designed for St. Augustine grasses. The plan includes two applications in spring and fall, aligning with typical temperate-to-warm-season lawn rhythms. It supports a balanced weed-control approach while supplying essential nutrients to promote healthier turf. The formulation targets common St. Augustine weed pressures and provides a practical option for homeowners seeking a straightforward, seasonally repeated regimen.
BioAdvanced 3-in-1 Weed And Feed Southern Lawns (20 lb)
This 20-pound variant from BioAdvanced extends coverage for larger yards while maintaining the 3-in-1 approach for Southern lawns, including St. Augustinegrass. It emphasizes six months of weed-prevention alongside fertilization and weed killing. Homeowners with substantial lawn areas can benefit from the larger bag size, which reduces the frequency of purchases while maintaining weed control and turf nutrition. As with other Southern formulations, it targets Floratam and related varieties and should be used in accordance with local climate and lawn care guidelines.
Buying Guide: Key Purchase Considerations
- Grass type compatibility: Confirm the product is labeled for St. Augustine and, if possible, Floratam varieties to ensure compatibility with your lawn.
- Weed timing and control: Choose products offering both pre-emergent and post-emergent control or a strong weed-prevention profile to reduce seasonal weed growth.
- Nitrogen content and release: Higher nitrogen can boost green-up, but slower-release formulas help extend feeding between applications and avoid scorch during heat waves.
- Coverage and bag size: For large lawns, opt for bigger bags or multi-pack options to minimize reorders and ensure consistent treatment across the entire area.
- Application timing: Some products work best in spring and fall; others require wet turf conditions for activation. Always follow label directions for accurate timing and rates.
- Safety and local regulations: Atrazine-based products may have usage restrictions in certain regions. Check local guidelines to stay compliant.
- Environmental impact: Consider slow-release formulations and targeted weed-killers to minimize runoff and protect nearby plants and waterways.
- Brand and availability: Reputable brands with clear labeling simplify troubleshooting and ensure consistent results across seasons.