Best Herbicide for St. Augustine Grass: Safeguarding Your Lawn With the Right Solution

Maintaining a lush and healthy St. Augustine grass lawn requires effective weed control solutions. Finding the best herbicide for St. Augustine grass is crucial for keeping your lawn free from unwanted invaders. With a plethora of options available on the market, selecting the right herbicide can be overwhelming. In this comprehensive guide, we will review top-rated herbicides tailored specifically for St. Augustine grass, providing you with valuable insights to make an informed purchase decision that will help you achieve a pristine and weed-free lawn.

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Understanding Herbicide Options for St Augustine Grass

St. Augustine grass is a popular warm-season turfgrass known for its lush, green appearance. However, like all types of grass, St. Augustine grass can be susceptible to weeds that can mar its beauty and health. Herbicides play a crucial role in maintaining a weed-free St. Augustine grass lawn.

When choosing an herbicide for St. Augustine grass, it is important to select a product specifically formulated for use on this particular type of turf. Some herbicides may be too harsh and can damage or even kill St. Augustine grass. Reading and following the product label instructions is essential to ensure the herbicide is safe and effective for use on St. Augustine grass.

Selective herbicides are commonly used for targeting specific types of weeds while leaving the desirable grass unharmed. These herbicides work by targeting the biochemical processes unique to certain weed species, making them an effective and precise way to control weeds in St. Augustine grass without harming the turfgrass.

It is recommended to apply herbicides during the growing season when weeds are actively growing for optimal effectiveness. Regular maintenance practices such as proper mowing, watering, and fertilization in conjunction with herbicide treatments can help keep St. Augustine grass healthy and weed-free, promoting a vibrant and thriving lawn.

The Best Herbicide For St Augustine Grass

01. Ortho Weed B Gon Weed Killer for St. Augustine Grass

I recently tried Ortho Weed B Gon Weed Killer on my St. Augustine grass, and I was impressed with the results. The product effectively targeted a variety of weeds, including dandelions and clover, without harming my precious lawn.

The application was easy with the ready-to-use spray bottle, and I noticed visible wilting of the weeds within a few days. The selective formula specifically designed for St. Augustine grass ensured that my lawn remained lush and green while eliminating the unwanted invaders. Overall, Ortho Weed B Gon proved to be a reliable and efficient solution for controlling weeds in my yard.


  • Targets and kills a variety of common weeds
  • Safe to use on St
  • Easy to apply with a hose-end sprayer
  • Fast-acting formula that shows results within hours
  • Rainproof within hours of application
  • Can cover large areas with a single bottle


  • Harmful to bees and aquatic organisms.
  • May cause skin and eye irritation.

02. Southern Ag Atrazine Weed Killer for St. Augustine Grass

Southern Ag Atrazine Weed Killer is a reliable solution for tackling stubborn weeds in St. Augustine grass lawns. Its potent formula effectively targets a wide range of broadleaf and grassy weeds, providing quick and noticeable results. The convenient liquid concentrate form allows for easy mixing and application, making it suitable for both residential and commercial use.

Users praise the product for its efficiency in controlling weeds without harming the St. Augustine grass. With proper application, Southern Ag Atrazine Weed Killer can effectively maintain a lush and weed-free lawn. Overall, this product offers a cost-effective and practical solution for homeowners looking to combat unwanted weeds in their St. Augustine grass lawns.


  • Effective in controlling a wide range of broadleaf and grassy weeds
  • Specifically formulated for use on St
  • Provides season-long control of weeds
  • Easy to apply with a sprayer
  • Economical option for large lawn areas


  • Harmful to aquatic life.
  • Restricted for use on certain types of grass.

03. BioAdvanced All-in-One Lawn Weed and Crabgrass Killer

Maintaining a lush, weed-free lawn is a breeze with BioAdvanced’s All-in-One Lawn Weed and Crabgrass Killer. This powerful formula effectively targets a wide range of common weeds and invasive crabgrass, saving time and effort for homeowners. With just one application, users can enjoy a beautifully manicured lawn without the hassle of multiple products.

The convenient spray bottle makes application easy, and its fast-acting formula delivers visible results in a short amount of time. Plus, the selective nature of this weed killer ensures that it targets weeds without harming the surrounding grass, providing a comprehensive solution for lawn care needs. Say goodbye to pesky weeds and hello to a vibrant, healthy lawn with BioAdvanced!


  • Effective at killing a wide range of lawn weeds and crabgrass.
  • Provides visible results within hours of application.
  • Easy to use with a ready-to-spray bottle.
  • Can cover large lawn areas with one application.
  • Does not harm the grass when used as directed.


  • Potential harm to non-target plants
  • May require multiple applications for effective results
  • Limited coverage for larger lawn areas

04. Gordon’s Trimec Lawn Weed Killer

Known for its powerful formula, Gordon’s Trimec Lawn Weed Killer delivers exceptional results in eliminating stubborn weeds from the lawn. With a fast-acting solution, this product effectively targets a variety of broadleaf weeds, leaving the grass lush and weed-free. It is easy to apply and works quickly to improve the overall appearance of the lawn, making it a favorite among homeowners.

Gordon’s Trimec Lawn Weed Killer is a reliable and trusted solution for maintaining a pristine lawn. Its effectiveness and ease of use make it a go-to product for those looking to rid their yards of unsightly weeds without the hassle of complicated applications.


  • Effectively kills a wide range of lawn weeds.
  • Easy-to-use liquid formulation for convenient application.
  • Suitable for use on various turfgrass types.
  • Targets weeds without harming grass.
  • Fast-acting results within a few days.
  • Economical option for spot treatment or large area coverage.


  • May harm desirable plants if not applied carefully.
  • May require multiple applications for effective weed control.

05. Bayer Advanced Southern Weed Killer for Lawns

Specifically formulated for Southern lawns, Bayer Advanced Southern Weed Killer effectively targets and eliminates common weeds like dollarweed, clover, and dandelion. With a fast-acting formula, this product controls broadleaf and grassy weeds without harming the lush green grass. Users praise its ease of application and noticeable results within days, making it a reliable choice for maintaining a healthy, weed-free lawn in the Southern region.

Ideal for homeowners seeking a convenient solution to combat weeds in warm-season grasses, Bayer Advanced Southern Weed Killer stands out for its selective control and ability to cover large areas with ease. Its long-lasting effects provide ongoing protection, ensuring a well-manicured lawn that remains free from invasive weeds.


  • Kills tough weeds
  • Safe for Southern lawns
  • Controls over 90 types of weeds
  • Easy to use
  • Results visible in 24 hours


  • Harmful to aquatic organisms.
  • May cause skin irritation.

Section Heading: The Importance of Using Herbicide for St. Augustine Grass

For homeowners and garden enthusiasts who have St. Augustine grass, investing in herbicide is essential for maintaining a healthy and vibrant lawn. St. Augustine grass is a warm-season grass that is susceptible to weeds like crabgrass, clover, and dandelions. Without proper weed control, these invasive plants can outcompete the St. Augustine grass, leading to a patchy and unkempt lawn. Using the best herbicide for St. Augustine grass is crucial in preventing weed infestations and ensuring the grass thrives.

The best herbicide for St. Augustine grass targets specific weeds while preserving the health of the turf. Selective herbicides are designed to kill weeds without harming the St. Augustine grass, allowing it to grow vigorously and fill in bare spots effectively. Regular applications of herbicide not only eliminate existing weeds but also prevent future weed growth, maintaining the lush appearance of the lawn.

Effective weed control with herbicide also reduces the need for manual weeding, saving homeowners time and effort in lawn maintenance. By choosing the best herbicide for St. Augustine grass and following proper application guidelines, individuals can enjoy a weed-free and lush green lawn throughout the growing season.

Choosing the Right Herbicide for St Augustine Grass

Selecting the appropriate herbicide for your St. Augustine grass is crucial for effective weed control and the health of your lawn. Consider factors such as the type of weeds present, the application method, any potential harmful effects on the grass, and adherence to local regulations when choosing the right product. Making an informed decision will ensure successful weed management and a thriving St. Augustine grass lawn.

Selective Herbicide For St. Augustine Grass

Selective herbicide for St. Augustine grass is crucial because it targets specific weeds while preserving the health of the desired grass species. By opting for a selective herbicide, you can effectively eliminate unwanted weeds without harming your valuable St. Augustine grass. This factor is essential in maintaining a lush and healthy lawn, as using non-selective herbicides can damage or even kill your grass along with the weeds. Selective herbicides offer a targeted solution that effectively controls weeds while ensuring the continued growth and vibrancy of your St. Augustine grass, providing a more sustainable and efficient approach to lawn care.

Effectiveness Against Target Weeds

Choosing an herbicide that is effective against the specific weeds that commonly affect St. Augustine grass is crucial for successful weed control. Different types of herbicides target specific weeds, so selecting one that targets the invasive species in your lawn will ensure effective results. Without considering this factor, you may not achieve the desired outcome of weed eradication and could potentially harm the St. Augustine grass. By choosing an herbicide tailored to the target weeds, you can effectively manage weed infestations while promoting the health and growth of your St. Augustine grass.

Safety For St. Augustine Grass

Ensuring the safety of St. Augustine grass when selecting an herbicide is crucial to protect the health and vitality of the lawn. Using herbicides that are not labeled as safe for St. Augustine grass can result in damage to the grass, such as yellowing, browning, or even death. This can lead to costly repairs and reseeding efforts to restore the lawn to its former lush state. By choosing an herbicide specifically formulated to be safe for St. Augustine grass, homeowners can effectively control weeds while preserving the health and aesthetics of their lawn.

Application Timing And Frequency

One should consider the factor of application timing and frequency when choosing herbicide for St. Augustine grass to ensure optimal effectiveness and minimal impact on the grass. St. Augustine grass has specific growth patterns and sensitivities, so applying herbicide at the right time can maximize its uptake and target weeds more effectively. Additionally, understanding the recommended frequency of application helps maintain a balance between weed control and grass health. Proper timing and frequency can also prevent excessive chemical use and minimize potential harm to the environment and surrounding vegetation, making it crucial for successful weed management in St. Augustine grass.

Environmental Impact

Considering the environmental impact when choosing herbicide for St. Augustine grass is crucial for maintaining a balance between effective weed control and sustainability. Opting for eco-friendly herbicides with minimal negative effects on the environment can help preserve soil health, protect water sources from contamination, and safeguard beneficial organisms in the ecosystem. By selecting herbicides that are less harmful to the environment, individuals can contribute to a healthier and more sustainable landscape for both their St. Augustine grass and the surrounding ecosystem. Making environmentally-conscious choices can promote long-term sustainability and biodiversity in the environment.

Application Tips For Using Herbicide On St. Augustine Grass

When applying herbicide on St. Augustine grass, it is crucial to first correctly identify the type of weeds present in your lawn. Not all herbicides are effective against all weed varieties, so choose a product specifically designed to target the weeds threatening your St. Augustine grass.

Before application, carefully read and follow the instructions provided on the herbicide label. Pay attention to the recommended dilution ratios, application rates, and safety precautions. Using more herbicide than directed can harm your St. Augustine grass, while using less may not effectively control the weeds.

Apply herbicide on a calm day when wind speeds are low to prevent drift onto desirable plants or into water sources. Avoid applying herbicide when rain is expected within the next 24 hours, as this can reduce its effectiveness. It is advisable to water your lawn a day or two before application to ensure the soil is moist, allowing better absorption of the herbicide.

After applying the herbicide, avoid mowing your lawn for a few days to allow the product to work effectively. Monitor your St. Augustine grass over the following weeks to observe the results of the herbicide application. If needed, follow up with a second application as recommended by the herbicide manufacturer.

Safety Precautions When Using Herbicides On St. Augustine Grass

When using herbicides on St. Augustine grass, it is essential to prioritize safety precautions to protect both yourself and your lawn. Always read and follow the instructions provided by the herbicide manufacturer to ensure proper application and effectiveness. Wear appropriate protective gear such as gloves, a mask, and goggles to prevent skin contact and inhalation of harmful chemicals.

Before applying any herbicide to your St. Augustine grass, make sure to identify the specific type of weeds you are targeting. Some herbicides can be selective, targeting only certain types of weeds, while others may harm the grass itself if not used correctly. Take caution to apply the herbicide evenly and only to the areas where weeds are present to minimize the impact on your St. Augustine grass.

Ensure that you store herbicides properly in a secure location away from children and pets. Remember to dispose of any leftover herbicide or containers according to the manufacturer’s guidelines to prevent environmental contamination. If you have any concerns or questions about using herbicides on your St. Augustine grass, it is recommended to consult with a professional lawn care expert for guidance and advice.

How To Maintain A Healthy St. Augustine Lawn After Herbicide Application

After applying herbicide to your St. Augustine grass, maintaining a healthy lawn is crucial for successful recovery. Watering is essential post-application. Ensure your lawn receives adequate water to help flush out any remaining herbicide and promote new growth. Aim for deep, infrequent watering sessions to encourage strong root development.

Avoid mowing for about a week after herbicide application to give your St. Augustine grass time to recover and fully absorb the herbicide. Once you resume mowing, set your mower blades to a higher setting to avoid stressing the recovering grass. Regular mowing at the proper height will help maintain a healthy lawn and prevent weed growth.

Fertilizing your St. Augustine grass after herbicide application can aid in its recovery and promote lush, green growth. Choose a fertilizer specifically formulated for St. Augustine grass and apply it according to the recommended schedule for your region. Proper fertilization will help your lawn rebound from the herbicide treatment and thrive.

Monitor your St. Augustine lawn closely after herbicide application. Keep an eye out for any signs of stress or weed encroachment. Promptly address any issues that arise by adjusting your lawn care routine as needed. With consistent monitoring and proper care, your St. Augustine grass will bounce back and regain its health and vitality.


What Is The Best Herbicide For Controlling Weeds In St. Augustine Grass?

For controlling weeds in St. Augustine grass, atrazine is often recommended as an effective herbicide. It targets a wide range of broadleaf and grassy weeds while being safe for St. Augustine grass when used according to instructions. Atrazine can be applied selectively without harming the desirable grass, making it a popular choice for weed control in St. Augustine lawns. It is important to follow the label directions and application rates for best results and to prevent any damage to the grass.

How Can I Effectively Kill Weeds Without Harming My St. Augustine Grass?

To effectively kill weeds without harming St. Augustine grass, you can spot treat the weeds with herbicides labeled as safe for use on St. Augustine grass. Be sure to follow the instructions on the product label carefully to avoid damaging your grass. Additionally, maintaining a healthy lawn by regular mowing, watering deeply but infrequently, and fertilizing appropriately can help prevent weeds from taking over and compete with your grass. Regularly checking and pulling out weeds by hand can also be an effective way to control their growth without harming your grass.

Are There Any Specific Herbicides That Are Safe To Use On St. Augustine Grass?

Yes, there are specific herbicides that are safe to use on St. Augustine grass. Some selective herbicides like Atrazine, Metsulfuron-methyl, and 2,4-D are considered safe for use on St. Augustine grass. It’s important to carefully read the label instructions and follow the recommended application rates to ensure the herbicide is applied correctly without damaging the St. Augustine grass. Consulting with a local gardening expert or professional landscaper can also provide guidance on selecting the appropriate herbicide for your specific needs.

What Are Some Important Factors To Consider When Choosing A Herbicide For St. Augustine Grass?

When choosing a herbicide for St. Augustine grass, it is crucial to consider selectivity to ensure that the herbicide targets the specific weeds without harming the grass. Additionally, understanding the stage of growth of the weeds and the grass is essential in determining the most effective herbicide to use. Factors such as application timing, weather conditions, and dosage also play a vital role in the herbicide’s efficiency and the overall health of the St. Augustine grass. Consulting with a professional or referring to product labels can provide valuable guidance in selecting the right herbicide for your specific needs.

How Frequently Should Herbicides Be Applied To Maintain A Healthy St. Augustine Grass Lawn?

It is recommended to apply herbicides for St. Augustine grass only as needed, typically when weeds are actively growing and present in the lawn. Avoid over-applying herbicides to prevent harming the grass. For pre-emergent herbicides, timing is crucial, usually at the beginning of the growing season to prevent weed seeds from germinating. Consult with a professional or follow the product label’s instructions for specific application guidelines tailored to your lawn’s needs. Applying herbicides judiciously will help maintain a healthy St. Augustine grass lawn without causing unnecessary harm.


In the quest for maintaining a lush St. Augustine grass lawn free from weeds, choosing the best herbicide is crucial. Through our comprehensive reviews and buying guide, it is evident that selecting a herbicide specifically formulated for St. Augustine grass ensures effective and safe weed control. With the right herbicide, you can enjoy a healthy and vibrant lawn without harming the grass itself. Investing in the best herbicide for St. Augustine grass is an essential step towards achieving a weed-free and thriving lawn.

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