Maintaining St Augustinegrass and Bermuda grass requires selecting weed killers that target common broadleaf and grassy weeds without harming your warm-season lawn. The following products are among the most relevant options for U.S. homeowners dealing with these grasses, offering a mix of pre-emergent and post-emergent control, as well as lawn fertilizers that reinforce weed resistance. This guide highlights five reliable products and explains how to choose the right one for your lawn conditions.
Summary of chosen products
| Product | Brand | Key Benefit |
|---|---|---|
| Southern Ag Atrazine St. Augustine Grass Weed Killer | Southern Ag | Kills broadleaf weeds; suppression of crabgrass; suitable for St. Augustine and centipede. |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (10 lb) | BioAdvanced | Weed killer and lawn fertilizer for Southern lawns; up to 6 months of protection. |
| Hi-Yield Atrazine Weed Killer | VPG | Atrazine-based control for St. Augustine and Centipede grasses; broad weed coverage. |
| Fertilome St. Augustine Weed & Feed 15-0-4 (25.6 lbs) | Ferti-lome | Pre- and post-emergent weed control with a 15-0-4 fertilizer mix for St. Augustine lawns. |
| Ortho WeedClear Weed Killer for Lawns (32 oz., 2-Pack) | Ortho | Kills 250+ weeds down to the root; works on St. Augustine, Bermuda, and more when used as directed. |
Southern Ag Atrazine St. Augustine Grass Weed Killer
The Southern Ag Atrazine formulation is a broadleaf weed killer designed for St. Augustinegrass and related warm-season lawns. It provides targeted control of common broadleaf weeds and also offers suppression for crabgrass. Suitable for use in centipede grass as well, this product emphasizes a practical approach to mixed-species yards. Homeowners should follow label directions to minimize turf stress and ensure even application across the lawn.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (10 lb)
BioAdvanced’s 3-in-1 product blends weed control with lawn nutrition, formulated specifically for southern grasses like Bermudagrass and St. Augustinegrass (including Floratam). It offers up to six months of weed prevention, helping to reduce future germination of listed broadleaf and grassy weeds such as crabgrass. This option is well-suited for homeowners seeking a combined weed management and feeding solution, supporting lawn vigor while addressing weed pressure.
Hi-Yield Atrazine Weed Killer
Hi-Yield Atrazine is a widely used herbicide that targets common weeds in St. Augustine and centipede lawns. The product emphasizes seasonal weed control through atrazine-based chemistry, with attention to weed species like annual bluegrass and several common lawn weeds. It is often selected for its effectiveness on warm-season lawns and compatibility with established beds when applied according to label directions.
Fertilome St. Augustine Weed & Feed 15-0-4
This Fertilome blend combines weed control with a balanced fertilizer for St. Augustine lawns. The 15-0-4 formulation supports turf health while addressing a spectrum of weeds. It is designed for Centipede, Zoysia, and St. Augustine varieties, and it carries a caution not to use on Bermuda or other Northern grasses. The product is positioned for homeowners who want a single-step solution that feeds as it fights weeds.
Prime Source Celsius WG – Post Emerge Weed Control
Prime Source Celsius WG offers a post-emergent weed control option with easy-mix packaging. Marketed toward professional settings and high-quality turf management, it emphasizes rapid action and professional-grade results. While suitable for St. Augustine lawns, users should follow mixing and application instructions to avoid stressing sensitive areas. This product is best for growers or meticulous homeowners seeking fast, reliable weed suppression in established turf.
Image Weed Killer Concentrate 32 Oz. (Central Garden & Pet)
Central Garden & Pet’s image weed killer concentrate is designed for broadleaf weed control with rapid results. It lists effectiveness against dandelion, chickweed, clover, dollarweed, spurge, and more, with quick action that can deliver visible results within hours. It is formulated for use on established warm-season and cool-season turfgrasses, making it a flexible option for mixed lawns or transitional seasons. Proper dilution and application per label are essential for best outcomes.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (20 lb)
This larger 20-pound BioAdvanced option extends the 3-in-1 approach to larger yards, delivering weed prevention for up to six months while feeding Southern lawns like Bermudagrass and St. Augustinegrass. The product targets broadleaf and grassy weeds such as crabgrass and dandelion, supporting lawn health with a balanced nutrient mix. For homeowners with sizable lawns, this formulation offers long-term weed control alongside ongoing nutrition.
Ortho WeedClear Weed Killer for Lawns (32 oz., 2-Pack)
Ortho WeedClear is a ready-to-use lawn weed killer designed to kill over 250 listed weeds, including dandelion and clover, down to the root. It’s suitable for St. Augustinegrass (not Floratam), Bermudagrass, Centipedegrass, Zoysiagrass, and other common warm-season varieties when used as directed. The 2-pack provides convenience for larger properties or seasonal re-treatment. Users should follow label directions for safe and effective results.
Buying Guide: Key Purchase Considerations
When choosing a weed killer for St Augustine or Bermuda lawns, consider the following factors to maximize effectiveness while protecting your turf:
- Grass type compatibility: Verify whether the product is labeled for St. Augustinegrass, Bermudagrass, Centipede, or Floratam variants, to avoid turf damage.
- Weed spectrum: Identify the weeds you want to control (dandelion, dollarweed, crabgrass, clover, etc.) and select a product targeting those species. Some formulas emphasize pre-emergent protection, others post-emergent control.
- Application timing: Pre-emergents work best before weeds germinate, while post-emergents are most effective after weeds appear. Consider your lawn’s season and recent weed pressure.
- Single-step vs. split solutions: Weed killers that also feed the lawn offer convenience, but pure herbicides may be preferable if you already fertilize separately.
- Maintenance plan: For ongoing weed suppression, combine herbicide treatments with proper mowing height, irrigation, and cultural practices to strengthen turf resilience.
- Safety and labels: Always follow label directions, wear protective gear if required, and avoid mixing with incompatible products. Some formulations are not suitable for all seasons or lawn types.
- Environmental impact: Consider products with lower environmental impact and localized label guidance to minimize runoff and soil disruption.
- Size and coverage: For larger lawns, select products offered in bags or concentrates with clear coverage estimates to avoid waste and ensure even application.
- Professional vs. DIY: For complex weed issues or large properties, professional application may provide more reliable results and soil health considerations.
In summary, the best choice depends on your lawn’s grass type, the weeds you’re targeting, and how you prefer to manage fertilization. Combining a selective herbicide with proper lawn care practices can maintain the health and appearance of St Augustine and Bermuda lawns while keeping weed pressure under control.