St. Augustine grass thrives with the right blend of weed control and nutrition. This guide highlights five reliable products that target common lawn weeds while providing essential nutrients to St Augustine varieties, including Floratam. Each option listed below offers a different balance of weed control and feeding, helping you maintain a lush, weed-free lawn through varying seasons.
Summary of chosen products:
| Product | Brand | Focus | Coverage | Typical Use |
|---|---|---|---|---|
| Scotts Turf Builder Southern Triple Action | Scotts | Weed killer, fire ant preventer, fertilizer | Up to 8,000 sq. ft. | Weed control + insect prevention + feeding |
| Southern Ag Atrazine St. Augustine Weed Killer | Southern Ag | Selective weed control for St. Augustine | 1 quart treats ~3,720 sq. ft. | Targeted weed control |
| Sunniland St.Augustine Weed & Feed | Generic | Weed control + fertilizer | 5,000 sq. ft. | Seasonal weed suppression |
| LESCO St. Augustine Weed And Feed | LESCO | Weed and feed tailored for St. Augustine | 50 lb bag coverage varies | Slow release feeding |
| Spectracide Weed Stop For Lawns (St. Augustine & Centipede) | Spectracide | Concentrate weed killer | 32 oz concentrate (6-pack) | Broad weed control without harming lawn |
Scotts Turf Builder Southern Triple Action
Scotts Turf Builder Southern Triple Action combines three functions in one bag: it kills listed weeds, prevents and kills fire ants, and provides lawn fertilizer to strengthen turf against heat and drought. Designed for Southern grasses such as St. Augustine, Floratam, Centipede, Zoysiagrass, and Carpetgrass, this product aims to deliver ongoing protection for up to six months against fire ants and common lawn pests like armyworms and ticks. Application is straightforward for established lawns, though users should follow label directions regarding timing and water needs. The 8,000 sq. ft. coverage makes it suitable for mid- to large-sized yards in warmer climates. For homeowners seeking a single, combined solution, this product offers weed control and nourishment in one step.
Southern Ag Atrazine St. Augustine Weed Killer
Southern Ag Atrazine St. Augustine Weed Killer is a targeted herbicide designed to control common weeds in St. Augustinegrass and Centipedegrass. Each quart bottle treats a substantial area when applied as directed, providing selective control of persistent broadleaf and grassy weeds that commonly appear in warm-season lawns. Atrazine is a trusted pre-emergent and post-emergent option in many warm climates when used according to label directions. This product is particularly suitable for homeowners seeking a cost-effective solution with specific efficacy on St. Augustine varieties, though it requires careful application to avoid off-target effects and to adhere to local regulations regarding herbicide use.
Sunniland St.Augustine Weed & Feed
Sunniland St.Augustine Weed & Feed is designed for St. Augustine lawns, combining weed control with fertilizer in a convenient granulated form. The product emphasizes ease of use and coverage for up to 5,000 sq. ft. per bag, making it a practical option for mid-sized lawns. With spring and fall application cycles, homeowners can expect improved weed suppression and steady nutrient delivery to the turf. This option suits yards where a straightforward weed-and-feed approach is preferred, without multiple separate products.
LESCO 50 lb. St. Augustine Grass Weed And Feed
LESCO’s 50-pound bag targets St. Augustine grass with a slow-release formula designed to provide up to eight weeks of feeding while managing weeds. The product description highlights compatibility with Floratam and wet-turf application guidance, making it suitable for professional or DIY lawn care programs. Slow release helps maintain consistent nutrient supply across weeks, supporting healthy growth and resilience against pests and drought. This option is well-suited for larger properties or professionals who require durable bag coverage and reliable performance over time.
Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns
Spectracide Weed Stop is a ready-to-spray concentrate designed to kill weeds in St. Augustine and centipede lawns while leaving the lawn unharmed when used as directed. The product includes atrazine, a widely used herbicide for lawn weed control. The formulation is suitable for homeowners who prefer a direct-application solution that can target emerging weeds efficiently, facilitating flexible and quick weed management in warm-season lawns. Follow mixing and application instructions carefully to avoid damage to desirable grasses and to meet local guidelines on herbicide use.
Ortho WeedClear Weed Killer For Lawns (Ready-to-Spray)
Ortho WeedClear Weed Killer For Lawns Ready-to-Spray offers broad-spectrum weed control, including dandelion and clover, with rapid results in a single application. It’s formulated for St. Augustinegrass (excluding Floratam) and several other warm-season and cool-season lawn types, making it versatile for different landscapes. For St. Augustine homeowners, this product provides a convenient option for spot treatment and larger-area coverage, especially when weeds are actively growing. Adhere to the label for safe and effective use, including water and temperature considerations.
Buying Guide: Key Purchase Considerations And Comparisons
When selecting a fertilizer and weed killer for St. Augustine grass, consider these factors to balance weed control with lawn health:
- St. Augustine compatibility: Always verify that the product is labeled for St. Augustinegrass, including Floratam varieties, to avoid turf damage.
- Weed profile: Identify common weeds in your area (dandelion, clover, chickweed, clover, sedges) and choose a product that targets those species effectively.
- Seasonality: Fall applications often focus on weed suppression and pre-winter feeding, while spring applications address rapid lawn growth and weed emergence.
- Active ingredients: Atrazine provides selective control for some warm-season grasses but may require careful application windows. Look for additional components like fertilizer or insect preventers if you need a combined solution.
- Coverage and bag size: Compare square footage coverage per bag and choose a product that matches your lawn size to minimize waste and ensure even application.
- Slow-release vs. quick-release: Slow-release fertilizers offer longer feeding with steadier growth, while quick-release can deliver rapid results but may require more frequent applications.
- Environmental and safety considerations: Follow label directions, respect local regulations, and consider environmental impact, especially near water sources or pollinator-friendly areas.
- Application method: Sprays, granules, and ready-to-use options each have practical pros. Choose based on your lawn size, equipment, and ease of use.
In practical terms, homeowners may prefer a single, all-in-one product for convenience, such as Scotts Turf Builder Southern Triple Action, which covers weed control, fire ant prevention, and feeding. For precise weed control in St. Augustine varieties, products like Southern Ag Atrazine or Spectracide Weed Stop offer targeted approaches. For larger lawns, LESCO’s slow-release feeding can provide ongoing nourishment, while Sunniland and Ortho products offer straightforward weed-and-feed or spot treatment options. Always follow label directions for safe and effective results.