St. Augustine grass requires targeted weed control that protects its thick, lush blades while keeping crabgrass, dalliance of broadleaf weeds, and annual grasses at bay. The following selections are commonly used by homeowners and professionals to maintain St. Augustine and Centipede lawns. Each product list below is chosen for effectiveness, safety on St. Augustine turf, and ease of application. Review features and usage notes to choose the best fit for your lawn’s needs.
| Product | Key Benefit | Size | |
|---|---|---|---|
| Atrazine St. Augustine Weed Killer | Southern Ag | Kills broadleaf and grassy weeds in St. Augustine | 32 oz / 1 quart |
| Atrazine St. Augustine Weed Killer | Southern Ag | Crabgrass suppression and weed control | 1 gallon |
| St. Augustine Weed & Feed | Ferti-Lome | Pre-emergent and post-emergent weed control with fertilizer | 25.6 lbs |
| Atrazine Weed Killer | Hi-Yield (VPG) | Targets annual bluegrass and chickweed in St. Augustine | Various |
| St. Augustine + Centipede Weed Killer | Southern Ag | Kills broadleaf weeds with crabgrass suppression | 32 oz |
These products span granular and liquid formulations, combining herbicides with optional fertilizers or post-emergent action. They are designed for St. Augustine and Centipede lawns, with several offering broad-spectrum weed control and some providing ongoing prevention. Always follow label directions and consider testing a small area before broader use to minimize turf stress and ensure compatibility with your lawn care schedule.
Southern Ag Atrazine St. Augustine Weed Killer (32 oz)
Product overview: This liquid herbicide provides targeted control for weeds in St. Augustine and Centipede grasses. One quart treats approximately 3,720 square feet, making it suitable for medium-sized yards. It helps manage common lawn weeds and is formulated for use on St. Augustine turf. The package weight aligns with typical gallon-equivalent formulations for convenient handling in a spray setup. For best results, apply during active growth periods and ensure uniform coverage to maximize weed kill while minimizing turf stress.
Southern Ag Atrazine St. Augustine Weed Killer, 1 Gallon
Product overview: This gallon-size Atrazine formulation is designed for St. Augustine and Centipede lawns, with weed-killing action on many broadleaf species. It also provides suppression of crabgrass when used as part of a broader weed-management plan. Consider compatibility with your existing lawn care program and the timing of applications to align with weed growth cycles. Always observe mixing instructions and application rates to avoid turf damage and ensure effective weed control.
Fertilome St. Augustine Weed & Feed 15-0-4
Product overview: This product combines pre-emergent and post-emergent weed control with a 15-0-4 fertilizer mix. It’s designed for Centipede, Zoysia, and St. Augustine lawns. The formulation aims to provide nutrient support while controlling emerging weeds. Do not use on Bermuda or other Northern grasses, as the product is tailored for Southern lawns. Apply according to label directions and avoid application during extreme heat or drought conditions to reduce turf stress.
Hi-Yield Atrazine Weed Killer
Product overview: Atrazine-based weed control tailored for St. Augustine and Centipede grasses. The product targets common weeds such as annual bluegrass and chickweed, providing suppression and kill action where these species are problematic. When applying, follow mixing instructions and ensure even coverage. Consider the timing of application in relation to weed life cycles and lawn care plans to optimize results without stressing the turf.
Southern Ag Atrazine St. Augustine Weed Killer (32 oz) + Celsius WG
Product overview: This combo pair pairs Atrazine-based weed control with Celsius WG for broad weed management. The Atrazine component targets weeds in St. Augustine and Centipede lawns, while Celsius WG adds a broad-spectrum herbicide that controls a wide range of weeds, including dandelions and others, and is described as safe for St. Augustine grass. The combination can be used to address both pre- and post-emergent needs, supporting a comprehensive weed-control strategy over multiple weeks. Follow label directions for each product to maintain lawn health.
Prime Source Celsius WG – Easy Mix Packet
Product overview: This post-emerge weed control packet emphasizes easy mixing, eliminating the need for separate measuring. It’s marketed as professional-grade, offering fast-acting results for Southern lawn types, including St. Augustine. The easy mix format can streamline applications, reducing setup time and potential measurement errors. As with any synthetic herbicide, follow label instructions and apply under appropriate weather conditions to protect turf health and ensure rapid weed kill with minimal turf damage.
Scotts Turf Builder Southern Triple Action
Product overview: This 3-in-1 formula is designed for Southern grasses, combining weed control, fire ant prevention, and lawn fertilization. It claims to prevent and kill fire ants for up to six months and provides protection against a range of pests including armyworms, fleas, and ticks. It’s suitable for St. Augustinegrass (including Floratam), Centipedegrass, Zoysiagrass, and Carpetgrass when applying a combined treatment that supports weed control with nutritional support. Check the label for application rates and restrictions to safeguard active lawns.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
Product overview: This product targets Southern lawns like Bermudagrass and St. Augustinegrass, combining weed control with lawn feeding. It claims up to six months of weed-prevention protection and addresses a variety of listed broadleaf and grassy weeds. It’s designed to keep lawns healthy and aesthetically pleasing by delivering essential nutrients while reducing weed pressure. Follow label directions for best results and avoid application during extreme heat or drought for turf safety.
Buying Guide
Key purchase considerations
- Grass type compatibility: Ensure the product is labeled for St. Augustine and Centipede grasses to avoid turf damage.
- Weed spectrum: Identify the main weeds in your lawn (dandelions, crabgrass, annual bluegrass, etc.) and select a product targeting those species.
- Form and application: Liquid concentrates, ready-to-use liquids, and granular formulations offer different ease-of-use and coverage. Choose based on your spray setup and storage capacity.
- Pre-emergent vs. post-emergent: Pre-emergents prevent weed seeds from germinating; post-emergents kill existing weeds. A combination may offer broader control, but follow timing guidelines.
- Safety and lawn health: Follow label directions to minimize stress on turf. Avoid applying in extreme heat, during drought, or if the lawn is stressed.
- Seasonality: For Southern grasses, spring and early summer are common windows for effective control, with adjustments for local climate and weed life cycles.
- Safety for pets and children: Review any restricted-use statements and cleaning guidelines after application to maintain a safe yard environment.
Product selection considerations
- Combination products: Some items pair weed control with fertilizer or pheromone-like components, offering dual benefits but requiring careful timing to avoid fertilizer burn or weed resistance.
- Crabgrass suppression: If crabgrass is a persistent issue, look for products specifically citing suppression or control of crabgrass in St. Augustine and Centipede lawns.
- Safety notes: Atrazine-based formulations can be effective but may require careful handling and timing. Confirm local regulations and environmental considerations before use.
- Application scale: For larger yards, one-gallon or larger formats can be more cost-effective, while smaller patches may benefit from ready-to-use liquids.
Selecting the right product involves balancing weed species, lawn type, and seasonal timing. When used properly, these options can maintain a healthy St. Augustine lawn with fewer weeds, improved color, and a robust growth habit. Always verify current labeling and local regulations before purchasing or applying any herbicide.