For St. Augustine lawns, selecting a granular weed killer that targets common broadleaf and grassy weeds without harming turf is essential. The products below are among the most relevant options available on Amazon, designed to suppress weeds and support healthy grass growth. This guide presents practical fits for different yard sizes and weed challenges, with objective notes on coverage, application, and turf compatibility.
| Product | Brand | Area Covered | Key Benefit |
|---|---|---|---|
| Atrazine St. Augustine Grass Weed Killer (1 Gal) | Southern Ag | Typically 1 gallon treats medium to large lawns | Broadleaf and grassy weed control with crabgrass suppression |
| Southern Weed Killer And Lawn Fertilizer (10,000 sq ft) | Scotts | Up to 10,000 sq ft | Kills existing weeds and strengthens turf with fertilizer |
| Atrazine St. Augustine Grass Weed Killer And Surfactant (1 Gal) | Southern Ag | 1 gallon covers sizable areas | Improved coverage and penetration with surfactant |
| Southern Weed & Feed2 (5,000 sq ft) | Scotts | Up to 5,000 sq ft | Weed control plus lawn fertilization |
| Florida Weed Killer And Lawn Fertilizer (5,000 sq ft) | Scotts | Up to 5,000 sq ft | Targets Florida-specific weeds while feeding turf |
Note: This introduction avoids pricing and focuses on weed control effectiveness, turf safety, and user guidance. Always follow label directions for your specific turf type and climate, and test on a small area if unsure about tolerance.
Atrazine St. Augustine Grass Weed Killer (1 Gal)
Product Overview: This atrazine-based weed killer is designed for St. Augustine and centipede lawns, delivering suppression of common broadleaf and grassy weeds. It also notes effectiveness against crabgrass in treated areas when used as directed. Application guidance typically emphasizes timing during active weed growth and avoiding stress periods for turf. The formulation aims for broad coverage and compatibility with established turf health when used seasonally as labeled.
Key Points
- Targets a range of broadleaf weeds and some grassy weeds
- Suitable for St. Augustine and centipede lawns
- Includes suppression of crabgrass when applied correctly
Scotts Turf Builder Bonus S Southern Weed & Feed2 (10,000 sq ft)
Product Overview: This weed killer plus lawn fertilizer is designed to suppress existing weeds while feeding the lawn to promote healthy growth and crowd out future weed encroachment. It targets common southern weeds such as dollarweed, clover, dandelion, chickweed, oxalis, henbit, and purslane, among others listed on the label. Application requires a dry lawn and watering in after spreading to activate the product. This approach supports both weed control and turf vigor during growth periods.
Key Points
- Combines weed control with fertilization
- Effective against several common southern weeds
- Water-in requirement after application
Atrazine St. Augustine Grass Weed Killer (1 Gal) With Surfactant
Product Overview: This product combines atrazine with a non-ionic surfactant to improve coverage, wetting, and penetration into leaf tissue. It is described as controlling many common grassy and broadleaf weeds in St. Augustine and centipede lawns, with suppression of crabgrass noted. The included surfactant is intended to enhance performance in tough lawn conditions, particularly when weeds are actively growing.
Key Points
- Added surfactant for better coverage
- Designed for St. Augustine and centipede grasses
- Crabgrass suppression as part of overall control
Florida Weed Killer And Lawn Fertilizer (5,000 sq ft)
Product Overview: This formulation focuses on Florida-specific weed pressures while providing lawn fertilization. It aims to strengthen turf against Southern stressors, improving density to outcompete weeds. It targets a range of common lawn invaders such as dollarweed, clover, dandelion, chickweed, oxalis, henbit, and purslane, with the added benefit of soil nutrients to sustain growth through warm seasons.
Key Points
- Florida-specific weed targets
- Concurrent lawn fertilization
- Supports dense turf growth to discourage weeds
Buying Guide
When choosing a granular weed killer for St. Augustine grass, consider the following:
- Turf compatibility: Ensure the product is labeled for St. Augustine or centipede grasses and consult local extension recommendations for your region and climate.
- Weed spectrum: Identify the primary weeds in your lawn (dandelion, clover, oxalis, dollarweed, crabgrass, etc.) and pick a product with proven efficacy against those targets.
- Application timing: Most granular products work best during active weed growth and moderate to warm temperatures. Avoid extreme heat or drought conditions for best results.
- Fertilization needs: Some products include fertilizer to support turf growth, which can help crowd out future weeds, while others are herbicides only. Match to your lawn care plan.
- Watering in: Many formulations require immediate watering after application to activate the product. Follow label instructions for optimal uptake.
- Surfactants and spreaders: Surfactants can improve coverage on waxy leaf surfaces; ensure compatibility with your chosen product.
- Safety and environment: Use appropriate protective gear, follow label warnings, and avoid applications near water sources or non-target plants.
- Size and coverage: Compare the coverage area (sq ft or gallons) to your lawn size. Larger lawns might benefit from concentrated, higher-volume formulations, while smaller yards can use standard sizes.
In practice, a granular weed killer labeled for St. Augustine lawns with options for both weed suppression and turf fertilization tends to deliver a balanced approach: controlling prevalent weeds while enhancing turf density to resist reinfestation. For Florida and southern regions, formulations that address local weed profiles can be more effective in long-term lawn health. Always verify label restrictions, particularly regarding regional guidance and safety.