Choosing an effective weed killer for St. Augustine and Bermuda lawns requires understanding weed types, grass tolerance, and application timing. This guide highlights five top options designed to control common broadleaf and grassy weeds while protecting warm-season grasses. Each product below targets Southern lawns and offers specific benefits such as long-lasting protection, quick knockdown, or selective action against sedges like nutsedge. Review product features, compatibility with Floratam or other St. Augustine varieties, and application recommendations to decide which fits your lawn’s needs.
| Product | Type | Target Lawns | Key Benefit |
|---|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer | Herbicide granules | St. Augustine, Centipede | Effective broadleaf and grassy weed control |
| BioAdvanced 3-in-1 Weed and Feed (20 lb) | Weed killer + fertilizer | Southern lawns (Bermuda, St. Augustine) | Weed control plus lawn nutrition |
| Spectracide Weed & Feed 20-0-0 | Weed killer + fertilizer | Various southern grasses | Kills weeds while feeding |
| Ortho Nutsedge Killer for Lawns | Liquid hose-end spray | Cool-season and warm-season grasses | Targets nutsedge and other listed weeds |
| PBI-Gordon Aethon Herbicide SL | Liquid herbicide | St. Augustine, Bermuda, Zoysia | Broad-spectrum, soaks underground weeds |
Southern Ag Atrazine St. Augustine Weed Killer, 32 oz
The Southern Ag Atrazine St. Augustine Weed Killer is a 32-ounce concentrate designed to control a broad spectrum of weeds in St. Augustine and centipede grasses. It treats a large area, with one quart covering about 3,720 square feet, making it suitable for medium to larger lawns. This product focuses on broadleaf and grassy weed suppression, helping maintain the vigor of warm-season turf while reducing competing species. Use according to label directions for best results and to protect desirable St. Augustine varieties.
Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon
This 1-gallon container provides another option from Southern Ag, designed to kill a wide range of broadleaf weeds and suppress crabgrass in St. Augustine and centipede grasses. The formulation aims to reduce weed competition while supporting continued turf health. It is suitable for residential lawns seeking a practical, cost-effective weed management solution with acceptable turf safety when used as directed.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (20 lb)
BioAdvanced 3-in-1 Weed and Feed is formulated for Southern lawns, including Bermudagrass and St. Augustinegrass (Floratam and other varieties). This product combines weed control with lawn fertilization, delivering up to six months of weed prevention. It targets listed broadleaf and grassy weeds such as crabgrass, dandelion, dollarweed, and clover, helping maintain lawn health while reducing weed growth across multiple seasons.
Spectracide Weed & Feed 20-0-0, 3 Count
Spectracide Weed & Feed combines weed control and lawn feeding in one easy-to-use package. Its dual-action formula targets major broadleaf weeds like dandelion, chickweed, clover, and plantain while delivering essential nitrogen to promote healthy turf. This option supports ongoing lawn maintenance with a simple application strategy, particularly for homeowners seeking a ready-to-use solution.
Ortho Nutsedge Killer for Lawns
Ortho Nutsedge Killer is a ready-to-use hose-end sprayer designed for lawn areas, eliminating listed weeds while protecting established turf grasses. It is particularly useful for controlling sedges such as nutsedge and dollarweed, along with other common lawn weeds. The hose-end application provides a quick, uniform spray across large areas, suitable for regular maintenance programs in St. Augustine and Bermuda lawns.
PBI-Gordon Aethon Herbicide SL
PBI-Gordon Aethon Herbicide SL is a Southern weed killer designed for warm-season turfgrasses, including Floratam St. Augustine and Bermuda. It focuses on eliminating over 45 tough broadleaf weeds, sedges, and kyllingas, with a formulation that targets underground tubers and rhizomes to prevent regrowth. The product emphasizes long-term suppression and compatibility with several warm-season lawn types, offering robust performance according to label directions.
Buying Guide
Key purchase considerations for weed killers in St. Augustine and Bermuda lawns include weed spectrum, grass compatibility, and application window.
- Weed targets: Identify whether you face broadleaf weeds, sedges (like nutsedge), or grassy weeds to choose a product with the right spectrum.
- Turf compatibility: Confirm that the product is labeled for St. Augustinegrass, Floratam, Bermudagrass, or Centipede, to avoid turf damage.
- Active ingredients: Atrazine-based products work well for many weeds but may require restrictions in certain areas; consider liquid vs. granular formulations based on yard size and water use.
- Duration and prevention: Some products offer up to six months of protection, while others provide immediate control with ongoing feeding. Decide whether you want ongoing prevention or a quick knockdown.
- Application method: Hose-end sprayers, granular spreaders, and liquid concentrates each require different equipment and timing relative to rainfall and mowing.
- Safety and timing: Follow label directions for watering, mowing height, and seasonal timing to maximize efficacy and protect beneficial grasses.
- Environmental and safety considerations: Avoid over-application and consider potential runoff or impact on nearby ornamentals and water sources.