Best Crabgrass Killers for St Augustine Grass to Keep Your Lawn Pristine 2025
Maintaining a healthy St Augustine grass lawn requires effective weed control to prevent crabgrass and other weeds from taking over. This article reviews top-rated crabgrass killers formulated specifically for St Augustine grass, ensuring safe and efficient weed removal without damaging your lawn. Below is a summary table showcasing the key products covered for easy comparison.
| Product | Primary Use | Coverage | Weed Types Controlled |
|---|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz | Selective Herbicide for St Augustine & Centipede Grass | 3,720 sq ft per quart | Broadleaf and crabgrass suppression |
| Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon | Broadleaf Weed Control & Crabgrass Suppression | Large area, 1 gallon size | Broadleaf weeds including crabgrass |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns, 10 lb | Fertilizer plus weed killer | Up to several thousand sq ft | Broadleaf and crabgrass |
| BioAdvanced Season Long Lawn Weed Killer + Preventer, 10 lb | Weed killer and preventer for Southern lawns | 4,000 sq ft | Broadleaf weeds and crabgrass |
| Roundup for Lawns Crabgrass Destroyer2, Ready-to-Use, 64oz | Crabgrass and tough grassy weed killer | Ready-to-use; coverage varies | Crabgrass, foxtail, goosegrass |
Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz
This atrazine-based herbicide is designed specifically for use on St Augustine and centipede grasses. With one quart treating up to 3,720 square feet, it covers a substantial lawn area. It controls a wide range of weeds common to Southern lawns, including crabgrass suppression. Its formulation helps maintain lawn health while effectively eliminating weeds. The light tan liquid is easy to apply, offering targeted action without damaging your grass. The product weighs slightly over 1 kilogram, perfect for homeowners looking for an effective specialty herbicide for their St Augustine turf.
Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon
This one-gallon product extends the benefits of atrazine herbicide for larger lawns. It kills many broadleaf weeds and offers crabgrass suppression, making it suitable for St Augustine and centipede grass types. The larger volume is ideal for extended use or bigger properties, aiding in comprehensive weed control. Its versatility includes both prevention and treatment of persistent lawn weeds while protecting your turf from damage.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns, Granules, 10 lb
This granular 3-in-1 formula is specially formulated for Southern lawns like Bermudagrass and St Augustinegrass varieties including Floratam. It combines lawn fertilizer with an effective weed killer, delivering up to 6 months of weed control. It targets broadleaf weeds such as dandelion, dollarweed, and clover while also suppressing crabgrass. The fertilizing aspect helps keep your lawn healthy and lush, making it a convenient dual-purpose solution for lawn care enthusiasts.
BioAdvanced Season Long Lawn Weed Killer + Preventer for Southern Lawns 10 LB Granules
This granular formula provides up to 6 months of weed killing and prevention in Southern lawns including all St Augustine varieties and Floratam. It kills broadleaf weeds like clover, chickweed, and dandelion as well as crabgrass and other grassy weeds. Designed to treat up to 4,000 square feet, it includes a residual herbicide that prevents weeds from returning, offering long-lasting turf protection. This product is ideal for homeowners seeking sustained control over both current weeds and future infestations.
Roundup for Lawns Crabgrass Destroyer2, Ready-to-Use, 64 oz.
Roundup for Lawns Crabgrass Destroyer2 is a ready-to-use spray formulated to kill crabgrass and tough grassy weeds such as foxtail and goosegrass. It targets weeds down to the root to prevent regrowth. While primarily recommended for cool-season grasses like Kentucky bluegrass and ryegrass, it can be cautiously used for spot treatment in St Augustine lawns with attention to timing and application rates. This product offers convenience with its ready-to-spray bottle, making it a practical option for quick crabgrass control.
Buying Guide for Crabgrass Killers on St Augustine Grass
Choosing the right crabgrass killer for your St Augustine lawn involves understanding several important factors to ensure effective weed control without damaging your turf.
1. Selectivity and Safety for St Augustine Grass
St Augustine grass is sensitive to many herbicides, so selecting a product specifically labeled for use on St Augustine is crucial. Products with atrazine are often effective and safe, but always check manufacturer guidelines to avoid grass injury.
2. Targeted Weed Types
Identify the primary weed problems in your lawn. If crabgrass is the main issue, look for products that specifically mention crabgrass control or suppression. Many broadleaf weed killers also provide some crabgrass control, which is helpful for mixed weed infestations.
3. Treatment vs. Prevention
Decide if you need a product for immediate weed elimination or long-term prevention. Granular weed preventers can last up to 6 months, stopping crabgrass before it sprouts, while liquid herbicides are best for treating active weeds.
4. Application Method and Coverage
Consider whether you prefer granular formulas that are spread with a broadcast spreader or ready-to-use liquid sprays. Granules generally provide longer residual control, but sprays can be more convenient for spot treatments. Also, verify the product’s coverage area to match your lawn size.
5. Additional Lawn Benefits
Some products also fertilize your lawn while killing weeds, such as the BioAdvanced 3-in-1 Weed and Feed. These dual-purpose formulas can simplify lawn care by promoting healthy grass growth while managing weeds.
6. Environmental and Usage Precautions
Follow all label instructions carefully to minimize environmental impact. Avoid application during windy days to prevent drift, and water the lawn as recommended to activate granular products. Always store herbicides securely and keep children and pets away from treated areas until safe.
By weighing these considerations, you can select the best crabgrass killer that matches your St Augustine grass lawn’s needs and ensures both weed control and turf health.