Finding the best post emergent weed killer for St. Augustine grass can be a challenge. Not all products suit this specific grass type.
St. Augustine grass is popular for its lush, green appearance. However, weeds can ruin its beauty. Using the right weed killer is essential to maintain your lawn’s health. In this blog post, we explore the top options available. We will discuss Southern Ag Atrazine, Scotts Turf Builder, Celsius WG, and Ortho WeedClear.
Each product has unique benefits and application methods. Our goal is to help you choose the best solution. Keep your St. Augustine grass weed-free and thriving with these effective products.
Southern Ag 006130 Atrazine St. Augustine Weed Killer

Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz Specialty Herbicide, Light Tan is a highly effective weed killer designed specifically for St. Augustine grass. This herbicide is known for its reliability in controlling a wide range of weeds, making lawn maintenance easier and more efficient.
Pros:
- Effective in controlling a variety of weeds.
- Specially formulated for St. Augustine grass.
- Easy to apply with clear instructions.
- Long-lasting results.
Cons:
- Limited to specific types of grass.
- Potential for over-application and damage.
- Requires careful handling and application.
The Southern Ag 006130 Atrazine St. Augustine Weed Killer stands out due to its specialized formulation for St. Augustine grass. This herbicide ensures that your lawn remains weed-free without compromising the health of your grass. The 32oz bottle provides ample coverage, making it a cost-effective solution for large lawns.
One of the key features of this product is its ease of use. The instructions are clear, and the application process is straightforward, reducing the chances of user error. However, it is important to note that careful handling is required to avoid over-application, which can lead to lawn damage. Overall, the Southern Ag Atrazine Weed Killer is a reliable choice for maintaining a pristine St. Augustine lawn.
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Southern Ag Atrazine St. Augustine Grass Weed Killer

The Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon is a powerful herbicide specifically designed for St. Augustine grass. This product is highly effective in controlling a wide range of broadleaf weeds and certain grassy weeds, making it a popular choice for maintaining healthy and beautiful lawns.
Pros:
- Effective in controlling broadleaf and grassy weeds.
- Specifically designed for St. Augustine grass.
- Easy to apply with clear instructions.
- Large 1-gallon size for extended use.
Cons:
- May require multiple applications for stubborn weeds.
- Not suitable for all types of grass.
- Can be harmful to desirable plants if not applied carefully.
The Southern Ag Atrazine St. Augustine Grass Weed Killer stands out due to its effectiveness in managing both broadleaf and grassy weeds. The 1-gallon size ensures that users have enough product to cover larger areas or multiple applications, which is often necessary for persistent weeds. Moreover, the product is specifically formulated for St. Augustine grass, making it a highly targeted solution for those particular lawns.
However, users should exercise caution when applying this herbicide, as it is not suitable for all grass types and can potentially harm desirable plants if not used correctly. Following the instructions carefully is crucial to avoid any damage. Despite these considerations, the Southern Ag Atrazine St. Augustine Grass Weed Killer remains a top choice for those looking to maintain a healthy, weed-free St. Augustine lawn.
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Scotts Turf Builder Winterguard Fall Weed & Feed3

Introducing the Scotts Turf Builder WinterGuard Fall Weed & Feed3, a weed killer combined with fall fertilizer designed to cover 5,000 sq. ft. and weighs 14.29 lbs. This product is crafted by The Scotts Company LLC and is a reliable choice for maintaining a healthy lawn during the fall season.
Pros:
- Combines weed killing and fertilizing in one product
- Covers a large area of 5,000 sq. ft.
- Easy to apply and use
- Provides nutrients to strengthen the lawn before winter
- Manufactured by the trusted brand Scotts
Cons:
- May require multiple applications for stubborn weeds
- Heavier package at 14.29 lbs
- Not suitable for all grass types
- Weather conditions can affect performance
The Scotts Turf Builder WinterGuard Fall Weed & Feed3 is an excellent choice for homeowners looking to maintain their lawns during the fall. Its dual-action formula ensures that your lawn gets the necessary nutrients while effectively controlling weeds. The product’s ability to cover a large area of 5,000 sq. ft. makes it suitable for medium to large lawns, providing convenience and efficiency in one package.
However, it’s important to note that multiple applications might be needed for persistent weeds, and the heavier package may be a consideration for some users. Additionally, the product’s effectiveness can be influenced by weather conditions, and it may not be suitable for all grass types. Despite these drawbacks, the benefits of using a trusted brand like Scotts can outweigh the cons, making it a valuable addition to your lawn care routine.
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Celsius Wg

Introducing the Celsius WG – 0.226 oz Easy Mix Packet-Post Emerge Weed Control, a highly effective solution for controlling post-emergent weeds. This product is designed by Prime Source and manufactured by Bayer, ensuring high quality and reliability. With its compact dimensions and lightweight, it is convenient to use and store.
Pros:
- Easy to mix and apply
- Highly effective in controlling post-emergent weeds
- Compact and lightweight for easy storage
- Reliable brand – Prime Source
- Manufactured by Bayer, a trusted name in the industry
Cons:
- Limited quantity – only 0.226 oz per packet
- Specific dimensions might not fit all storage spaces
The Celsius WG – 0.226 oz Easy Mix Packet-Post Emerge Weed Control is a great choice for those seeking an efficient solution to manage weeds post-emergence. Its easy mix formula ensures that users can quickly prepare the product for application, saving time and effort. The product’s effectiveness in tackling weeds makes it a preferred option for many.
Although the packet contains a limited quantity of 0.226 oz, it is sufficient for targeted applications. The product’s compact dimensions and lightweight design make it convenient to store, though it might not fit into every storage space. With the backing of Prime Source and Bayer, users can trust in its quality and performance.
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Ortho Weedclear Weed Killer For Lawns Ready-to-spray

Looking for an effective solution to keep your lawn free from weeds without harming the grass? The Ortho WeedClear Weed Killer for Lawns Ready-To-Spray might be just what you need. This product, manufactured by The Scotts Company LLC, promises to tackle common weeds like dandelions and clover across a large area of up to 16,000 sq. ft.
Pros:
- Covers a large area of up to 16,000 sq. ft.
- Won’t harm grass when used as directed
- Kills dandelion and clover effectively
- Convenient ready-to-spray formula
Cons:
- Can be harmful if not used as directed
- Weather conditions can affect effectiveness
- Requires careful storage to avoid spillage
The Ortho WeedClear Weed Killer stands out for its ease of use and large coverage area. Its ready-to-spray formula makes it convenient for homeowners looking to maintain a pristine lawn without the hassle of complex mixtures. Additionally, the assurance that it won’t harm grass provides peace of mind for users who want effective weed control without damaging their turf.
However, as with any chemical product, it is crucial to follow the instructions carefully to avoid unintended harm. The weather conditions can also play a role in the product’s effectiveness, so it’s best to apply it during optimal conditions. Overall, the Ortho WeedClear Weed Killer offers a promising solution for lawn care enthusiasts aiming to keep their lawns weed-free and healthy.
To buy this product, click here.
Frequently Asked Questions
What Is The Best Weed Killer For St. Augustine Grass?
Southern Ag Atrazine Weed Killer is highly recommended. It’s specially formulated for St. Augustine grass and effectively controls a variety of weeds.
How To Use Southern Ag Atrazine?
Mix the specified amount with water. Apply it evenly on your lawn. Follow label instructions for best results.
Does Ortho Weedclear Harm St. Augustine Grass?
No, Ortho WeedClear is safe for St. Augustine grass when used as directed. It effectively kills weeds without harming your lawn.
Can Scotts Turf Builder Be Used In The Fall?
Yes, Scotts Turf Builder WinterGuard is ideal for fall use. It kills weeds and fertilizes your lawn, preparing it for winter.
How Does Celsius Wg Control Weeds?
Celsius WG provides post-emergent control. It’s effective against a variety of broadleaf and grassy weeds in St. Augustine grass.
Conclusion
Choosing the best post-emergent weed killer for st. Augustine grass is crucial for a healthy lawn. Each product listed offers unique benefits. Southern ag atrazine is effective for broadleaf weeds. Scotts turf builder not only kills weeds but also fertilizes your lawn.
Celsius wg provides a potent mix for easy use. Ortho weedclear is a great option for large areas, treating up to 16,000 sq. Ft. Remember to follow the instructions carefully for the best results. This ensures your st. Augustine grass thrives while the weeds disappear.
Regular maintenance and proper application will keep your lawn lush and weed-free. Always consider your lawn’s specific needs when selecting a product. This way, you can enjoy a beautiful and healthy lawn.