The right weed control approach for St Augustine lawns blends pre-emergent and post-emergent strategies with lawn-safe products. This guide highlights five effective options that address common lawn weeds while keeping your St Augustine grass healthy. We compare coverage, weed targets, and application notes to help you choose confidently for a greener, weed-free lawn.
| Product | Brand | Approx. Coverage | Key Benefit |
|---|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz | Southern Ag | 3,720 sq ft per quart | Effective post-emergent control for St. Augustine and centipede grasses |
| Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon | Southern Ag | varies by application area | Kills many broadleaf weeds; suppresses crabgrass |
| Fertilome (13915) St. Augustine Weed & Feed 15-0-4 | ferti-lome | varies by lawn size | Pre-emergent and post-emergent weed control with lawn fertilizer |
| Spectracide Weed Stop For Lawns (32 oz, 6-pack) | Spectracide | depends on dilution; 6-pack provides multiple applications | Kills weeds without harming established lawn when used as directed |
| LESCO 50 lb St. Augustine Grass Weed and Feed with Penoxsulam | LESCO | treats large areas; accurate coverage per package | Slow-release feeding plus targeted weed control for St Augustine |
Note: Always follow label directions for timing, mixing, and application rates. Some products are safe for St Augustine but not for other grass types, and mixing considerations may apply for best results. Consider pairing pre-emergent options with post-emergent treatments to maximize weed suppression throughout the growing season.
Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz
Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz
Product Overview: This is a concentrated post-emergent herbicide designed specifically for St. Augustine and centipede grasses. It treats up to 3,720 square feet per quart and helps control common lawn weeds that plague warm-season grasses. The formula emphasizes selective action, aiming to reduce weed competitiveness without stressing the turf when used as directed. When applying, avoid application to newly seeded lawns and follow label instructions for best results.
What to Expect: Expect noticeable weed suppression within two to four weeks after treatment. Re-treatments may be necessary for persistent weed pressure, and the product is compatible with regular lawn maintenance practices. Always water in after application as required by the label to help the product reach the root zone.
Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon
Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon
Product Overview: This gallon-sized formulation targets a broad spectrum of weeds in St. Augustine turf, with additional utility in centipede grass. It provides weed suppression benefits and is a practical option for larger lawns or for households seeking fewer refillings. The product is designed to work both against broadleaf weeds and some grassy weeds when used as directed.
Application Notes: Follow labeling for application timing, coverage rates, and compatibility with lawn maintenance routines. This product is typically used for ongoing weed control across growing seasons and can be part of a broader weed management plan that includes cultural practices like proper mowing height and irrigation.
Fertilome (13915) St. Augustine Weed & Feed 15-0-4
Fertilome (13915) St. Augustine Weed & Feed 15-0-4
Product Overview: This product combines pre-emergent and post-emergent weed control with a 15-0-4 fertilizer mix. It’s formulated for St. Augustine, centipede, and certain other warm-season grasses, supporting weed suppression while providing essential nutrients. Do not use on Bermuda or other Northern grasses. The dual-action approach targets weed growth while nurturing turf health.
Usage Guidance: Apply during appropriate weed growth stages per label, and ensure the lawn can tolerate the fertilizer blend. This product is especially suitable for lawns that need both weed management and a maintenance feeding program in a single treatment.
Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns
Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns
Product Overview: This is a ready-to-spray concentrate designed for St. Augustine and centipede lawns. It focuses on killing emerged weeds while also providing suppression for seeds and new growth. The formulation is designed to be lawn-selective when applied exactly as directed, protecting the turf while clearing weeds.
Application Insights: Coverage depends on dilution, with multiple applications possible from the 32-ounce bottle. Use as part of a routine weed management plan, ensuring compatibility with your mowing schedule and irrigation practices. Always follow the product label to minimize any risk to your grass and the environment.
LESCO 50 lb St. Augustine Grass Weed and Feed with Penoxsulam
LESCO 50 lb St. Augustine Grass Weed and Feed with Penoxsulam
Product Overview: This is a professional-grade weed and feed product designed specifically for St. Augustine turf. It combines slow-release fertilizer with Penoxsulam weed control, providing extended weed suppression while feeding the lawn. It’s suitable for larger properties and commercial applications where consistent growth management is desired.
Application Notes: For best results, apply when the lawn is wet as recommended by the label and allow the product to dry before light traffic. The slow-release formulation supports sustained weed management and lawn nourishment over several weeks, helping to maintain turf density and reduce weed pressure.
Buying Guide: Key Considerations For Weed Control On St Augustine Lawns
What to look for When selecting a weed control product for St Augustine grass, consider the weed types you’re dealing with (broadleaf vs grassy weeds), whether you need pre-emergent or post-emergent action, and how the product affects your grass variety. Always confirm compatibility with St Augustine types like Floratam and Centipede varieties, and avoid products labeled for other grass species that could harm your lawn.
Coverage and timing Coverage varies by product; assess the size of your lawn to determine how many units you’ll need. Timing is essential: apply pre-emergents before weed seeds germinate, and post-emergents when weeds are actively growing. Seasonal timing can significantly impact effectiveness, so align applications with local climate patterns.
Trip planning for large lawns For larger areas, opt for products that come in bulk or gallon sizes, or consider slow-release formulations to reduce frequency of applications. Professional-grade treatments from brands like LESCO offer scalability for bigger properties, while consumer-grade options from Southern Ag and Spectracide provide accessible solutions for typical home lawns.
Safety and lawn health Always follow label directions regarding mixing, application rates, and watering requirements. Some products may require watering in after application, while others specify dry-down periods. Use protective gear as recommended and avoid applying during extreme heat or drought conditions to prevent turf stress.
Integrated weed management Combine chemical controls with cultural practices: mow at the proper height for St Augustine, irrigate appropriately, and maintain lawn health through balanced fertilization. A cohesive plan that blends herbicides with lawn care practices yields the best long-term weed suppression and turf resilience.
Environmental considerations Choose products with a favorable environmental profile and minimize runoff by applying on calm days and avoiding overspray onto non-target plants. Proper disposal of containers and adherence to label warnings helps protect waterways and beneficial organisms in your landscape.