St Augustine grass requires careful weed control to protect its sensitive root zone and maintain lush growth. The right herbicide will target common weeds without harming this warm-season turf. Below are five vetted products commonly used by homeowners and professionals, each suited for St Augustine soils and climates. This guide highlights what each product treats, application notes, and how they fit into an overall lawn care plan.
| Product | Brand | Type | Key Benefit |
|---|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz | Southern Ag | Atrazine Herbicide | Broad weed control for St Augustine and Centipede lawns |
| Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon | Southern Ag | Atrazine Herbicide | Kills many broadleaf weeds; supports crabgrass suppression |
| Fertilome St. Augustine Weed & Feed 15-0-4 | ferti-lome | Weed & Feed | Pre-emergent and post-emergent control with fertilizer |
| Southern Ag Atrazine St. Augustine Grass Weed Killer (1 Gallon) with Surfactant | Southern Ag | Atrazine Herbicide + Surfactant | Improved coverage and weed suppression |
| LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam | LESCO | Weed & Feed | Targeted weed control with slow-release fertilizer for St. Augustine |
Note: This article provides objective information about products commonly used for St Augustine lawns. Always follow label directions for safety, application timing, and compatibility with your turf variety before use.
Southern Ag Atrazine St. Augustine Weed Killer 32oz
Brand: Southern Ag. This quart-size product treats up to 3,720 sq ft and targets broadleaf weeds in St Augustine and Centipede grasses. It is designed to suppress crabgrass and is suitable for mid-season applications when weeds are actively growing. Follow label rates to avoid turf stress and ensure even coverage. Suitable uses include residential lawns and landscape edges where St Augustine is established.
Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon
Brand: Southern Ag. This larger gallon size provides wide-area coverage, killing many broadleaf weeds while also providing suppression of crabgrass. It is labeled for use on St Augustine and Centipede lawns, making it a versatile option for homeowners with mixed turf areas. Always read the label for proper dilutions and re-entry times after spraying.
Fertilome (13917) St. Augustine Weed & Feed 15-0-4
Brand: ferti-lome. This product combines weed control with a 15-0-4 fertilizer mix in a 25.6 lb bag. It is designed for Centipede, Zoysia, and St. Augustine lawns but should not be used on Bermuda or certain Northern grasses. Suitable as a spring or fall treatment to both feed the lawn and reduce weed pressure, while avoiding excessive fertilization in heat. Always check compatibility with your existing lawn care plan.
Southern Ag Atrazine St. Augustine Grass Weed Killer (1 Gallon) + Surfactant
Brand: Southern Ag. This combo includes an Atrazine weed killer plus a non-ionic surfactant to boost penetration and coverage. It provides suppression of crabgrass and broadleaf weeds in St Augustine and Centipede lawns. The surfactant helps ensure more uniform application and weed contact, potentially improving efficacy in uneven or dense turf areas. Follow label directions to minimize turf stress.
LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam
Brand: LESCO. This product provides a 50 lb fertilizer mix formulated for St Augustine turf, featuring Penoxsulam for selective weed control. It is designed to cover large areas and deliver slow-release feeding for up to eight weeks. It is particularly suited for Florida-type lawns where St Augustine is common and requires both weed suppression and nutritional support. Apply according to soil moisture and weather conditions for optimal results.
Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz and Surfactant Bundle
Brand: Southern Ag. This bundle adds a surfactant to the Atrazine weed killer, enhancing penetration and coverage for St Augustine and Centipede lawns. The product claims broadleaf weed control and crabgrass suppression, with a per-gallon spray coverage noted on the label. Use as part of a broader lawn care program to manage weed populations while minimizing turf stress when applied according to the label.
Buying Guide: Key Considerations for Choosing St Augustine Weed Solutions
- Turf compatibility: Confirm that the product is labeled for St Augustine and Centipede grasses to avoid damage to sensitive varieties.
- Active ingredient impact: Atrazine-based products are common and effective but may have environmental considerations. Consider your landscape and local regulations before use.
- Weed target and timing: Identify the main weed species (crabgrass, broadleaf weeds, etc.) and apply during appropriate growth stages for best results.
- Surfactants and spreaders: Adding a surfactant can improve coverage, especially on dense turf. Always use a compatible product as directed.
- Weed control vs. fertilization: Some products combine weed control with fertilizer, offering convenience but requiring careful adherence to application rates to avoid over-fertilization.
- Soil and moisture conditions: Apply on moist soil or as directed; some products require wetting the leaf surface for optimal uptake.
- Safety and re-entry: Adhere to restricted entry intervals and protective equipment recommendations on the label to protect household members and pets.
- Long-term lawn health: Consider integrating weed management with regular mowing, irrigation, and soil health practices to sustain St Augustine vigor.
- Environmental impact: Use the minimum effective amount and rotate among products to minimize resistance development and environmental load.