Best Granular Weed Killer for St Augustine Grass: Top Picks for 2026
Choosing the right granular weed killer for St Augustine grass helps protect lawns from common weeds while preserving turf health. The following selections focus on products compatible with St Augustine and centipede grasses, offering targeted control and, in some cases, fertilizer benefits to promote a thick, weed-resistant lawn. Each option includes key features to help you compare at a glance.
| Product | Key Benefit | Size / Coverage |
|---|---|---|
| Southern Ag Atrazine St. Augustine Grass Weed Killer (1 Gallon) | Broad weed suppression in St Augustine lawns | 1 gallon |
| Scotts Turf Builder Bonus S Southern Weed & Feed2 (10,000 sq. ft.) | Weed control plus lawn fertilizer | 10,000 sq. ft. |
| Southern Ag Atrazine St. Augustine Grass Weed Killer (1 Gallon) With Surfactant | Improved coverage and penetration with surfactant | 1 gallon |
| Scotts Turf Builder Bonus S Southern Weed & Feed2 (5,000 sq. ft.) | Weed control and fertilization in a smaller area | 5,000 sq. ft. |
| Scotts Turf Builder Bonus S Southern Weed & FeedF2 (Florida) (5,000 sq. ft.) | Florida-specific weed and feed formulation | 5,000 sq. ft. |
Southern Ag Atrazine St. Augustine Weed Killer, 1 Gallon
The Southern Ag Atrazine product targets many common grassy and broadleaf weeds that affect St. Augustine and centipede lawns. It provides suppression of crabgrass and is designed for use on warm-season turf where Atrazine-based treatments are appropriate. This option emphasizes effective weed control while aiming to minimize impact on established turf when applied according to label directions.
Scotts Turf Builder Bonus S Southern Weed & Feed2 (10,000 Sq Ft)
This Scotts blend combines weed control with slow-release fertilizer to foster deep roots and healthier turf. It is designed to combat listed weeds such as dollarweed, clover, dandelion, and others, helping to crowd out future weed growth. Apply to a dry lawn when grass and weeds are actively growing, then water in soon after for best results.
Southern Ag Atrazine St. Augustine Grass Weed Killer (1 Gallon) With Surfactant
This variant adds a non-ionic surfactant to improve coverage and penetration of the Atrazine herbicide on St. Augustine and centipede lawns. The surfactant helps ensure the product reaches target weeds more effectively, potentially enhancing suppression of crabgrass and other listed weeds when used as directed.
Scotts Turf Builder Bonus S Southern Weed & FeedF2 (Florida)
This Florida-specific weed killer and lawn fertilizer combines weed suppression with a formulation tailored to Southern conditions. It supports growth of a thicker lawn to help crowd out future weeds and addresses regionally common invaders like dollarweed and oxalis. Use as directed when turf and weeds are actively growing, with immediate watering after application.
Buying Guide
Key factors to consider when choosing a granular weed killer for St Augustine grass include weed type, lawn size, and application requirements. Atrazine-based products provide broad control but require attention to label restrictions and regional regulations. Weed-and-feed formulations offer both weed control and nutrition, which can be convenient for establishing a dense lawn. Surfactants can enhance coverage and penetration, especially in tough turf conditions. For larger lawns, equipment compatibility and coverage per bag help determine value. Always follow label directions, avoid applying during extreme heat, and water the lawn as directed to activate the product.
Performance considerations across perspectives:
- Weed Spectrum: If your lawn battles broadleaf and grassy weeds, consider products that list both weed types and how they interact with St Augustine turf.
- Turf Health: Weed-and-feed products can strengthen turf health, but some lawns may respond better to a separate weed killer with subsequent fertilization.
- Region and Climate: Florida and Southern states often require formulations tailored to heat tolerance and specific weed pressures; Florida-specific options may offer advantages in those areas.
- Application Timing: Most products work best when weeds and grass are actively growing. Avoid applying during drought stress or extreme heat to prevent turf injury.
- Safety and Regulations: Be mindful of local environmental regulations and any restrictions on Atrazine or other active ingredients in your state.
Choosing the right product depends on weed pressure, lawn size, and whether you prefer an all-in-one fertilizer option or a dedicated weed killer. The selections above provide a range of approaches suitable for St Augustine dominance, centipede compatibility, and Florida-friendly lawn care strategies. Always read the product label before purchasing or applying to ensure the product matches your lawn’s needs and local guidelines.