Protect your St. Augustine grass with targeted weed killers that control broadleaf and grassy weeds without harming your lawn. This guide reviews select products designed for St. Augustine and Centipede grasses, highlighting effectiveness, application methods, and safety considerations. Always follow label directions for best results and environmental safety.
| Product | Brand | Type | Notes |
|---|---|---|---|
| Southern Ag Atrazine St. Augustine Weed Killer 32oz | Southern Ag | Concentrate/Quarts | Targets broadleaf weeds in St. Augustine and centipede grasses |
| Southern Ag Atrazine St. Augustine Grass Weed Killer | Southern Ag | Concentrate/Gallon | Kills many broadleaf weeds; suppression of crabgrass |
| Spectracide Weed Stop For Lawns | Spectracide | Concentrate/Ready-to-Spray | Controls emerged and seed weeds; safe for St. Augustine and centipede when used as directed |
| Hi-Yield Atrazine Weed Killer | VPG | Concentrate | For use in St. Augustine and Centipede grass |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | Granules | Weed killer plus fertilizer for Southern lawns including St. Augustine |
Southern Ag Atrazine St. Augustine Weed Killer 32oz
This Atrazine-based weed killer is designed to treat large areas, with one quart covering up to 3,720 sq ft. It targets weeds in St. Augustine and centipede grasses, making it a practical choice for Florida lawns. When applying, ensure the lawn is actively growing and avoid application during extreme heat or drought. Always follow label directions to minimize turf stress and environmental impact.
Southern Ag Atrazine St. Augustine Grass Weed Killer
This gallon-sized Atrazine formula is suitable for larger lawn areas. It kills a broad range of weeds and is also applicable to centipede grass. The product provides weed suppression for crabgrass under certain conditions. For best results, apply when weeds are actively growing and avoid application during hot midday sun or drought stress to protect turf health.
Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns
This ready-to-spray formula is engineered to kill weeds while preserving lawn health. It contains atrazine and is labeled for St. Augustinegrass varieties and centipedegrass. Apply as directed to minimize impact on desirable grasses and ensure even coverage for both emerged weeds and potential seeds. Avoid applying during windy conditions to prevent drift to non-target plants.
Hi-Yield Atrazine Weed Killer RTS (32 oz)
The Hi-Yield Atrazine RTS offers a selective weed control option for St. Augustine and centipede lawns. It targets annual bluegrass and other common broadleaf weeds. The 32-ounce bottle treats a substantial area, making it suitable for moderate-size yards. Follow label directions for irrigation, re-entry intervals, and safety precautions to protect the turf and environment.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
This granulated product combines weed control with lawn fertilizer, targeting Southern lawns including St. Augustinegrass. It provides up to six months of protection against listed broadleaf and grassy weeds, aiming to reduce maintenance frequency. Use as directed to avoid lawn burn and to align with seasonal growth cycles. It is designed to nourish the lawn while suppressing weed emergence, contributing to overall turf health.
Buying Guide
Key purchase considerations for weed killers safe for St. Augustine lawns:
- Grass compatibility: Verify the product lists St. Augustinegrass or centipedegrass on the label. Some formulas are labeled specifically for these grasses, reducing the risk of turf damage.
- Weed targets: Identify whether you need broadleaf weed control (dandelions, clover) or grassy weed suppression (crabgrass, annual bluegrass). Select a product that targets your weed mix.
- Form factor: Ready-to-use sprays are convenient, while concentrates may require mixing. Choose based on yard size and application cadence.
- Safety and timing: Apply during active growth, avoid extreme heat, and observe re-entry intervals. Use protective gear as recommended and avoid runoff into non-target areas.
- Soil and weather considerations: Some products rely on herbicide uptake; soil moisture and recent rainfall can influence efficacy. Plan around forecasted rain and irrigation schedules.
- Long-term impact: Some products offer short-term weed control with a one-time treatment, while others provide extended prevention when used as part of a broader lawn care plan.
- Environmental impact: Consider pet and child safety, especially for households with active outdoor play. Natural or pet-safe options may reduce risk, but ensure weed control effectiveness remains adequate.
Buying strategy comparisons:
- Herbicide-only products (e.g., Atrazine-based formulas) are typically strong for broadleaf weeds but may require careful timing to avoid turf stress. They are effective for established weeds in St. Augustine lawns.
- Weed-and-feed products combine nutrition with weed control, reducing maintenance steps but requiring attention to fertilizer needs for your lawn’s growth stage and soil fertility.
- Ready-to-spray formulations offer quick application, while concentrates provide flexibility for larger property sizes or varying weed pressure.
- Always check the label for target grasses, application rates, and any regional restrictions to ensure compliance and lawn safety.