The best weed killer sprays for St. Augustine grass include Southern Ag Atrazine, Ortho WeedClear, and Spectracide Weed Stop. These products effectively eliminate weeds while protecting your lawn.
St. Augustine grass is a popular choice for homeowners due to its lush appearance and resilience. However, it can be susceptible to various weeds, which can hinder its growth and beauty. Selecting the right weed killer is essential for maintaining a healthy lawn.
Products like Southern Ag Atrazine and Ortho WeedClear not only target common weeds like dandelions and clover but also ensure that the grass remains unharmed when used as directed. These sprays are easy to apply and can cover large areas, making them ideal for homeowners looking to keep their lawns pristine.
Southern Ag Atrazine St. Augustine Weed Killer 32oz

The Southern Ag 006130 Atrazine St. Augustine Weed Killer is a highly effective specialty herbicide designed to tackle unwanted weeds in your lawn. This 32oz formula is particularly suitable for St. Augustine grass, providing targeted control of various weed species while promoting the health of your grass.
Pros:
- Highly effective against a wide range of weeds
- Specifically formulated for St. Augustine grass
- Easy to apply with the included instructions
- Light tan color blends well with lawn
Cons:
- May require multiple applications for stubborn weeds
- Not suitable for all grass types
- Requires careful handling due to its chemical nature
This herbicide is formulated to deliver precise weed control, making it an excellent choice for homeowners seeking to maintain a pristine lawn. With dimensions of 8.0 inches in height, 3.0 inches in width, and a weight of 2.08 pounds, it is conveniently sized for storage and application. The Southern Ag brand is known for its quality products, and this Atrazine formula is no exception.
Another noteworthy feature is its user-friendly application method, which comes with clear instructions for optimal results. The Southern Ag 006130 not only targets weeds effectively but also supports the overall health of your St. Augustine grass, ensuring that your lawn stays lush and vibrant. Remember to follow safety guidelines during application to protect your other plants and the environment.
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Ortho Weedclear Weed Killer For Lawns Ready-to-spray

The Ortho WeedClear Weed Killer for Lawns Ready-To-Spray is a powerful solution designed to tackle pesky weeds without harming your grass. This product effectively treats up to 16,000 sq. ft., ensuring that your lawn remains vibrant and healthy. Formulated to kill common weeds like dandelion and clover, it offers a straightforward application method thanks to its ready-to-spray feature. If you’re looking for an efficient way to maintain your lawn’s appearance, this weed killer could be the ideal choice.
- Effectively kills common weeds like dandelion and clover.
- Safe for grass when used as directed.
- Covers up to 16,000 sq. ft., making it suitable for large lawns.
- Ready-to-spray formulation for easy application.
- Lightweight at just 2.44 pounds for convenient handling.
- May require multiple applications for severe infestations.
- Effectiveness can vary depending on environmental conditions.
- Clear color might not visually indicate coverage areas.
The Ortho WeedClear Weed Killer stands out with its user-friendly ready-to-spray design, making lawn care simpler than ever. Its ability to cover a substantial area means that homeowners can address weed problems efficiently without the hassle of mixing or measuring. As an added benefit, when used according to the instructions, it won’t harm your grass, ensuring a lush, green lawn remains intact while effectively eliminating unwanted weeds.
Another notable feature of this product is its specific targeting of dandelion and clover, two of the most common weeds that can disrupt the beauty of your lawn. This targeted approach not only enhances the appearance of your outdoor space but also promotes healthier grass growth. With the Ortho WeedClear Weed Killer, you can achieve a well-maintained lawn that is free from invasive weeds, allowing your yard to flourish.
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Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns Concentrate

The Spectracide Weed Stop For Lawns is a specialized herbicide designed specifically for St. Augustine and Centipede lawns. This ready-to-spray solution comes in a convenient 32-ounce bottle and is sold in a 6-pack. With its unique formula, it effectively targets a variety of weeds while being safe for your lawn type, making it a popular choice among homeowners.
Pros:
- Effectively targets common weeds without harming St. Augustine and Centipede grasses.
- Ready-to-use formula saves time and effort in lawn care.
- Convenient packaging (32-ounce) suitable for small to medium-sized lawns.
- Easy application with a spray nozzle.
- Backed by the trusted Spectracide brand.
Cons:
- May not be effective against all types of weeds.
- Requires careful application to avoid overspray on desired plants.
- Some users report a strong chemical smell during application.
The Spectracide Weed Stop For Lawns is designed to provide homeowners with a reliable solution for maintaining a healthy lawn. Its application method is straightforward, allowing users to spray directly onto the weeds, ensuring precise targeting. This feature is particularly beneficial for those who wish to eliminate pesky weeds without harming their grass types.
One of the standout features of this product is its compatibility with St. Augustine and Centipede grasses, which can be sensitive to many herbicides. The formulation is crafted to be tough on weeds yet gentle on your lawn, making it an excellent choice for maintaining a vibrant and lush outdoor space. However, while it performs well against many common weeds, it’s essential for users to follow the application instructions to avoid potential damage to desirable plants.
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Southern Ag Atrazine St. Augustine Grass Weed Killer

The Southern Ag Atrazine St. Augustine Grass Weed Killer, available in a convenient 1 Gallon size, is an effective solution for controlling unwanted weeds in your lawn. This product is specifically formulated for use on St. Augustine grass, ensuring that your lawn remains healthy while keeping pesky weeds at bay.
Pros:
- Highly effective in controlling a variety of weeds
- Specifically designed for St. Augustine grass
- Easy to apply with a simple spray mechanism
- Cost-effective solution for large lawns
- Reduces competition for nutrients, promoting healthier grass growth
Cons:
- May require multiple applications for best results
- Not suitable for all grass types
- Potential harm to surrounding vegetation if not applied carefully
- Requires adherence to safety precautions during application
The Southern Ag Atrazine St. Augustine Grass Weed Killer is a specialized herbicide that effectively targets a wide range of weeds while being gentle on your grass. Its unique formulation ensures that your St. Augustine grass remains unharmed, allowing it to thrive even in the presence of tough weeds. This makes it an ideal choice for homeowners looking to maintain a beautiful lawn without compromising on the health of their grass.
With dimensions of 11.90 x 7.40 x 4.20 inches and a lightweight design of just 0.27 pounds, this product is not only easy to handle but also convenient for storage. The ease of application adds to its appeal, making lawn care simpler for both novices and seasoned gardeners. However, it is essential to follow the recommended usage guidelines to avoid any unintended damage to other plants in the vicinity.
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Roundup For Lawns₆ Ready-to-spray (southern)

Introducing the Roundup for Lawns₆ Ready-to-Spray (Southern), a powerful all-in-one weed killer designed specifically for your lawn. This 32 oz. solution tackles unwanted weeds effectively while ensuring your grass stays healthy and vibrant.
Pros:
- Easy to use with a convenient ready-to-spray format
- Targets a wide variety of weeds without harming your lawn
- Effective formula designed for southern lawns
- Fast-acting results, often visible in just a few days
Cons:
- May require multiple applications for tougher weeds
- Potentially harmful to non-target plants if over-applied
- Not suitable for use in vegetable gardens or flower beds
The Roundup for Lawns₆ Ready-to-Spray (Southern) stands out as a reliable choice for homeowners looking to maintain a pristine lawn. Its 32 oz. capacity is perfect for treating medium-sized areas, while the easy-to-use spray system ensures you can apply it with minimal hassle. The product is specifically formulated to tackle common southern weeds, making it an essential tool for anyone living in these climates.
With its fast-acting formula, you can expect to see results in just a few days, allowing you to enjoy a lush, weed-free lawn quickly. However, it’s important to apply it carefully to avoid affecting non-target plants, and for especially stubborn weeds, you may need to repeat the application. Overall, the Roundup for Lawns₆ offers a balance of effectiveness and ease of use, making it a go-to solution for weed control.
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Frequently Asked Questions
What Is The Best Weed Killer For St. Augustine Grass?
The best weed killers for St. Augustine grass include Southern Ag Atrazine and Ortho WeedClear. These products effectively target common weeds like dandelions and clover. Always follow application directions to ensure safety for your grass. Consider your lawn size when choosing the product size.
How Do I Apply Weed Killer Safely?
To apply weed killer safely, read the label instructions carefully. Use a sprayer for even coverage. Apply on a dry day with no rain forecasted. Avoid windy conditions to prevent drift. Always wear protective gear like gloves and a mask for added safety.
Can I Use Any Herbicide On St. Augustine Grass?
Not all herbicides are suitable for St. Augustine grass. Select products specifically designed for this grass type. Look for labels that mention St. Augustine compatibility. Using the wrong herbicide can damage your lawn, so always verify before application.
When Is The Best Time To Apply Weed Killer?
The best time to apply weed killer is during the growing season. Early spring or fall is ideal for targeting weeds. Avoid application during extreme heat or drought conditions. This ensures better absorption and effectiveness, promoting a healthier lawn.
How Long Does It Take For Weed Killer To Work?
Most weed killers show results within 7 to 14 days. Factors like weather, type of weed, and product formulation affect this timeline. Be patient, and avoid mowing the lawn until the weeds die off. This maximizes the effectiveness of the treatment.
Is It Safe For Pets After Application?
Most weed killers recommend keeping pets off treated areas for 24-48 hours. Always check the product label for specific safety guidelines. Once the area is dry, it’s generally safe for pets to return. Ensuring your pets’ safety is crucial while maintaining your lawn.
Conclusion
Choosing the right weed killer spray for st. Augustine grass is crucial for maintaining a healthy lawn. Each product on our list, from southern ag atrazine to ortho weedclear, offers unique benefits. Southern ag 006130 targets tough weeds effectively while being safe for your grass.
Ortho weedclear provides a ready-to-spray option for easy application, and spectracide is perfect for those larger areas. Roundup for lawns₆ ensures a comprehensive solution for various weed types. Selecting the best product depends on your specific lawn needs and preferences.
Always follow application instructions to avoid damaging your grass. Regular maintenance and timely treatment can keep your st. Augustine grass lush and vibrant. Investing in quality weed killers will pay off in the long run. A well-cared-for lawn enhances your home’s curb appeal and creates a welcoming outdoor space.
Make an informed choice today and enjoy a weed-free, thriving lawn.