10 Best Weed Killer For St Augustine Grass: Find The Perfect Solution 2026

Southern Ag 006130 Atrazine St. Augustine Weed Killer effectively controls weeds in St. Augustine and Centipede grasses. This specialty herbicide treats up to 3,720 square feet per quart. Its light tan color allows for easy application, and the package weighs 1.021 kilograms.

This product is ideal for homeowners with St. Augustine grass struggling with weed issues. It is suitable for those seeking a reliable herbicide that covers a significant area, ensuring their lawn remains healthy and weed-free.

Southern Ag Atrazine St. Augustine Grass Weed Killer comes in a one-gallon size. It effectively kills various broadleaf weeds and offers suppression of crabgrass. This product controls both emerged weeds and weeds from seed, making it versatile for lawn care.

Ideal for homeowners dealing with extensive weed problems in St. Augustine grass, this product is effective across various conditions. Its broad-spectrum weed control makes it suitable for anyone looking to maintain a pristine lawn.

BioAdvanced Season Long Lawn Weed Killer + Preventer is a 10 lb granule product. It kills and prevents weeds for up to six months, targeting broadleaf weeds like dandelion and clover. It also prevents crabgrass and other grassy weeds for effective long-term control.

This product is perfect for homeowners seeking long-lasting weed control in southern lawns. Its application is suitable for all varieties of St. Augustine grass, making it a reliable choice for those aiming for a beautiful lawn.

Hi-Yield Atrazine Weed Killer features a 4.00% Atrazine formula. It effectively controls or suppresses various weeds, including annual bluegrass and chickweed. This product is specifically designed for use in St. Augustine and Centipede grass, ensuring effective weed management.

Ideal for homeowners with weed problems in their St. Augustine lawns, this product is best for those seeking a targeted solution against tough weeds. Its effectiveness in controlling multiple types makes it a worthy consideration.

BioAdvanced 3-in-1 Weed and Feed is a 10 lb granule that acts as both a weed killer and lawn fertilizer. It provides up to six months of weed prevention while nourishing the lawn. This product kills listed weeds like dandelion and clover, ensuring a healthy lawn.

This product is ideal for homeowners wanting a dual-action solution for St. Augustine grass. It combines fertilization with weed control, making it a convenient choice for maintaining lawn health and beauty.

Scotts Turf Builder Bonus S Southern Weed & Feed2 combines weed killer and lawn fertilizer in one product. It controls various weeds, including dollar weed and clover, while feeding the grass for stronger roots. This 34.48 lb bag covers up to 10,000 sq. ft.

This product is perfect for homeowners seeking comprehensive lawn care solutions. Its dual-action formula makes it suitable for those wanting to nourish their lawn while keeping weeds at bay.

Ortho WeedClear Lawn Weed Killer Ready-to-Use1 is designed for spot treatment of weeds in lawns. It effectively kills over 250 listed weeds, including dandelion and clover, without harming grass when used as directed. The product comes in a 1-gallon container with a Comfort Wand applicator.

This product is ideal for homeowners needing quick and effective spot treatment. Its ease of use and fast-acting formula make it suitable for those managing small weed infestations in their lawns.

Fertilome St. Augustine Weed & Feed combines herbicide and fertilizer in a 25.6 lb package. It provides a 15-0-4 fertilizer mix and controls weeds effectively. This product is specifically formulated for St. Augustine, Centipede, and Zoysia grass types.

This product is suitable for homeowners looking for a comprehensive solution for their St. Augustine lawns. Its dual-action formula helps maintain lawn health while managing weed growth throughout the season.

Sunniland St. Augustine Weed & Feed Lawn Fertilizer is a granular product that covers 5,000 sq ft. It is easy to spread and handle, providing effective weed control. The formulation is suitable for all types of St. Augustine grass, making it versatile for various lawns.

This product is ideal for homeowners wanting an easy-to-use solution for St. Augustine grass. Its two-application strategy in spring and fall ensures optimal lawn health and weed management.

After applying weed killers, maintain a consistent watering schedule to help the product activate properly. Avoid mowing immediately after application to allow the herbicide to work effectively. Monitor your lawn regularly for new weed growth and take action promptly. Implement a balanced fertilization plan to support grass recovery and growth.

Consider seasonal changes when scheduling applications. Timing applications correctly can lead to better results. Regularly check the product instructions for specific care recommendations to ensure optimal performance.

A common mistake is not identifying the specific weeds present. Applying the wrong product can lead to ineffective treatment. Another mistake is using a weed killer not suitable for St. Augustine grass, which can cause damage. Additionally, over-applying products can harm the lawn and lead to poor growth.

Many homeowners forget to consider weather conditions for application. Rain can wash away products before they work. Lastly, neglecting maintenance after application can reduce effectiveness. Follow product guidelines for the best outcome.