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Best Weed Killer For St Augustine Grass (2023 Update)

If you're looking for the best weed killer for St. Augustine grass, it's important to consider a few important factors before making your purchase. First, you'll want to determine what type of weeds you're dealing with. Different weed killers are designed to target different types of weeds, so understanding your specific needs is crucial. Secondly, you'll want to consider the safety of the product. Look for weed killers that are safe for your grass, but also environmentally-friendly and safe for use around pets and children. Finally, consider the effectiveness of the product. You want a weed killer that will not only kill existing weeds, but one that will prevent new weeds from growing as well.

Some questions to consider when choosing a weed killer for St. Augustine grass include: Are there any specific weeds that are particularly difficult to eliminate? What is the recommended application rate and schedule? Will the weed killer have any adverse effects on surrounding plants or wildlife? Is the product easy to use and apply, or will professional help be required? By considering these questions and doing your research, you can make an informed decision about the best weed killer for your St. Augustine grass.

10 Best Weed Killer For St Augustine Grass

# Product Image Product Name Product Notes Check Price
1

This product is ideal for killing nutsedge weeds on lawns.

2

This product is ideal for killing weeds in St. Augustinegrass lawns.

3

Ideal for controlling weeds in St. Augustine and Centipede lawns.

4

This product is ideal for eliminating weeds and fertilizing southern lawns in one application.

5

The product is ideal for controlling weeds in lawns that are St. Augustine and Centipede varieties.

6

Ideal for killing weeds in lawns with southern climate, without harming the grass.

7

It is ideal for killing weeds in St. Augustine grass and other specified Southern turfgrass types.

8

The product is ideal for killing weeds in lawns.

9

This product is ideal for maintaining a healthy lawn by getting rid of weeds and providing essential nutrients.

10

This product is ideal for killing weeds in St. Augustine grass.

This product is ideal for killing nutsedge weeds on lawns.

This product is ideal for killing weeds in St. Augustinegrass lawns.

Ideal for controlling weeds in St. Augustine and Centipede lawns.

This product is ideal for eliminating weeds and fertilizing southern lawns in one application.

The product is ideal for controlling weeds in lawns that are St. Augustine and Centipede varieties.

Ideal for killing weeds in lawns with southern climate, without harming the grass.

It is ideal for killing weeds in St. Augustine grass and other specified Southern turfgrass types.

The product is ideal for killing weeds in lawns.

This product is ideal for maintaining a healthy lawn by getting rid of weeds and providing essential nutrients.

This product is ideal for killing weeds in St. Augustine grass.

1. Ortho Nutsedge Killer For Lawns Ready-To-Spray, 32 Fl. Oz.

This product is a highly effective solution for eliminating yellow and purple Nutsedge, Kyllinga and over 50 other challenging weeds from both Northern and Southern turf grasses. With its powerful formula, it ensures that the weeds are killed, while leaving the lawns unharmed.

One of the key advantages of this product is its quick action. It is rainproof within just 2 hours of application, ensuring that the effectiveness of the product is not affected by any unfavorable weather conditions. Additionally, this product comes ready to use, eliminating the need for any mixing and making it a convenient option for any homeowner or gardener.

The product is specially designed to target a wide range of tough weeds and is highly effective in delivering results. Its ability to eliminate over 50 different types of weeds makes it a versatile solution for any weed-related issues in your lawn.

Whether you have a Northern or Southern turf grass, this product is an excellent choice for eliminating weeds and keeping your lawn looking healthy and beautiful. With its reliable performance and ease of use, it is a must-have for any homeowner who wants to keep their lawn in top condition.

2. Ortho Weed B Gon Weed Killer For St. Augustinegrass Ready-To-Spray, 32 Oz

This powerful weed killer is specifically designed for use on St. Augustinegrass, including Floratam, and is guaranteed not to harm your lawn when used as directed. With the ability to kill over 250 listed weeds, this product is a must-have for any homeowner looking to maintain a beautiful and healthy lawn.

The fast-acting formula is rain-proof in just one hour, so you won't have to worry about the weather ruining your hard work. This weed killer can treat up to 2,500 square feet, making it perfect for both small and large lawns.

The label provides a comprehensive list of all the weeds that this product can effectively eliminate, ensuring that you can target the specific weeds that are plaguing your lawn. By eliminating these weeds, you'll be able to promote healthy grass growth and prevent future weed growth.

3. Centipede & St. Augustine Lawns Spectracide Concentrate.

The lawn is a beautiful feature of any home, but weeds can quickly tarnish its appearance. Fortunately, the solution is here. Introducing a powerful weed killer that targets weeds without harming your lawn. This product is specially formulated to control both emerged weeds and those that grow from seeds, ensuring that your lawn stays beautiful and healthy.

This weed killer contains Atrazine, which is effective in controlling weeds in all St. Augustinegrass varieties and centipedegrass. It targets tough weeds such as dollarweed, sandspur, and Florida betony, ensuring that every inch of your lawn is weed-free.

The QuickFlipTM hose-end sprayer is a convenient feature that makes application a breeze. Simply activate the spray at the flip of a switch and watch as the weed killer does its job. This product is easy to use and is designed for maximum results.

It is important to note that this product should be used as directed to avoid any damage to your lawn. When used correctly, it will efficiently control weeds without harming your lawn.

Say goodbye to unsightly weeds and hello to a beautiful, healthy lawn with this powerful weed killer. It is a must-have for any homeowner looking to maintain a pristine lawn.

4. Bioadvanced 3-In-1 Weed And Feed For Southern Lawns, Granules, 12.5 Lb

The BioAdvanced Weed and Feed is a specially formulated lawn product designed for Southern lawns. It is a highly effective solution that provides up to six months of protection against broadleaf, grassy weeds, and crabgrass. This powerful weed and feed product is designed to help homeowners maintain a healthy, lush lawn that is free of weeds and other unwanted growth.

This product is a reliable weed killer that effectively eliminates common weeds such as Dandelion, Dollarweed, and Clover. It contains potent herbicides that target weeds at their roots, ensuring that they do not grow back. With the BioAdvanced Weed and Feed, you can easily get rid of unwanted growth and ensure that your lawn remains green and healthy all year round.

In addition to providing weed control, this product is also a lawn fertilizer. It contains essential nutrients that feed and strengthen your lawn, promoting healthy growth and helping it to withstand stressors such as drought and foot traffic. This lawn fertilizer is specially formulated to provide the right balance of nutrients that your Southern lawn needs to thrive.

5. Spectracide Weed Stop For Lawns For St. Augustine And Centipede Lawns Concentrate

Introducing a revolutionary weed killer that is safe for all varieties of St. Augustinegrass and centipedegrass. This product is designed to kill weeds, not your lawn, when used as directed. It is an effective solution for homeowners who want a lush, green lawn without the hassle of weeds.

This weed killer is specifically formulated to kill established weeds, including dollarweed, sandspur and Florida betony. Check the product label for a complete list of weeds it can control. It is a reliable solution for homeowners who want to get rid of unsightly weeds without damaging their lawns.

In addition to killing established weeds, this product also prevents new weeds from growing. It controls weeds from seeds and prevents them from emerging in your lawn, keeping your lawn healthy and weed-free.

The Quickflip hose-end sprayer is an added convenience for homeowners. It attaches easily to your garden hose and activates at the flip of a switch. This makes it easy to apply the weed killer to your lawn without any hassle or mess.

The manufacturer of this product is so confident in its effectiveness that they offer a money-back guarantee. If you are not satisfied with the results, you can get your money back. Check the product label for details on the guarantee.

6. Roundup For Lawns₅ Concentrate (Southern) – All-In-One Weed Killer For Lawns, 32 Oz.

The solution to a healthy and lush lawn is within reach with this top-notch weed killer. With this product, you can bid adieu to pesky weeds that tend to hog your lawn's nutrients and space. This potent formula works like a charm and kills 93 types of weeds, including dollarweed, dandelion, clover, and yellow nutsedge. You can find a comprehensive weed list inside the booklet that comes with the product, which can help you identify the types of weeds that it can eliminate.

The weed killer is suitable for use on Southern grasses, including St. Augustine (including Floratam), Bermudagrass, Centipedegrass, and Bahiagrass. Plus, it's designed to kill weeds without harming the lawn (when used as directed). So, you can have peace of mind knowing that your lawn will remain unaffected while the weeds are eliminated.

This powerful formula starts working immediately, and in just four hours, it becomes rainproof. The concentrate formula is easy to mix, and one bottle of the product can treat up to 6,000 sq. ft. This feature makes it a cost-effective solution for homeowners who want to keep their lawns free of weeds.

It's important to note that this product is only available in AL, AR, AZ, FL, GA, HI, LA, MS, NC, NM, OK, SC, TX, UT, Guam, Puerto Rico. However, for those living in these areas, this product is an excellent choice for maintaining a weed-free lawn.

7. Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz Specialty Herbicide, Light Tan

This herbicide is a powerful solution for controlling weeds in St. Augustine and Centipede grasses. With a package weight of 1.021 kilograms and compact dimensions of 5.842 L x 19.177 H x 12.954 W (centimeters), it is easy to store and handle.

One quart of this herbicide is capable of treating an area of up to 3,720 square feet, making it ideal for both residential and commercial use. This powerful formula is effective in killing even the toughest weeds, ensuring that your lawn remains healthy and weed-free.

The herbicide is easy to apply and works quickly to eliminate weeds without harming your grass. It is formulated with high-quality ingredients that are safe for use around pets and children, making it a great choice for families with young children or pets.

8. Image 32 Oz. Southern Lawn Weed Killer Ready To Spray

Looking for a powerful weed killer that can effectively eliminate the toughest weeds? Look no further than this top-quality product that promises to get the job done quickly and easily. With its advanced formula, this weed killer can kill weeds down to their roots, ensuring that they don't come back anytime soon.

One of the best things about this product is that it's designed to be safe for use on floratam lawns. This means that you can use it to kill weeds without worrying about damaging your lawn in the process. When used as directed, this weed killer is guaranteed to be safe and effective, making it a top choice for anyone who wants to keep their lawn looking great.

With a coverage area of up to 5,000 square feet per 32 fl. oz. bottle, this weed killer is perfect for larger lawns or commercial properties. And thanks to its fast-acting formula, you'll be able to see results in just a few hours after application. Whether you're dealing with dandelions, crabgrass, or other stubborn weeds, this product is sure to get rid of them for good.

So why wait? If you're tired of dealing with unsightly weeds in your lawn, give this powerful and effective weed killer a try today. With its advanced formula and proven track record of success, you're sure to be impressed with the results.

9. Fertilome (10917) St. Augustine Weed & Feed 15-0-4 (32 Lbs.)

This herbicide and fertilizer combination is the perfect solution for controlling weeds and promoting a healthy lawn. With both pre-emergent and post-emergent capabilities, it ensures that your lawn stays free of weeds. Additionally, the fertilizer mix of 15-0-4 is specifically formulated for Centipede, Zoysia, and St. Augustine lawns and grass types.

It is essential to note that this product should not be used on Bermuda Grasses or any other type of Northern grass. To achieve the best results, apply the product in early spring. This will ensure that your lawn is adequately protected from weeds throughout the growing season.

This product is designed to cover an area of 5,000 square feet, and the application rate varies depending on the size of your lawn. For specific instructions on how to apply the product, please refer to the label.

10. Southern Ag Atrazine St. Augustine Grass Weed Killer, 1 Gallon

This herbicide is a highly effective solution for eliminating a wide range of broadleaf weeds. It is also suitable for use on centipede grass, making it a versatile option for lawn care. In addition to its ability to kill weeds, this herbicide also provides powerful suppression of crabgrass. Whether you are dealing with emerged weeds or those sprouting from seed, this herbicide offers excellent control. With its potent formula, you can be confident that you are using a reliable solution for keeping your lawn healthy and weed-free.

Best Weed Killer For St Augustine Grass FAQs

Are there any weed killers that are safe for pets and children on St. Augustine grass?

Yes, there are weed killers that are safe for pets and children on St. Augustine grass. These weed killers are made from organic or natural ingredients that are non-toxic to humans and pets. One such weed killer is corn gluten meal, which is a natural pre-emergent herbicide that prevents weed seeds from germinating. It is safe to use on St. Augustine grass and does not harm pets or children.

Another option is to use a vinegar solution as a natural weed killer. The acetic acid in vinegar acts as a desiccant, drying out the leaves of the weeds and killing them. However, it is important to use caution when using vinegar as it can also harm desirable plants if not applied properly.

It's always advisable to read the label before purchasing any weed killer. Look for products that are labeled as safe for pets and children, and follow the instructions carefully to ensure proper application. Additionally, it is recommended to keep pets and children away from the treated area until the weed killer has fully dried.

Can I use a pre-emergent weed killer on St. Augustine grass?

Yes, you can use a pre-emergent weed killer on St. Augustine grass, but you need to be careful about the type of herbicide you use. St. Augustine grass is a warm-season grass that is sensitive to certain herbicides, so you need to choose a pre-emergent weed killer that is safe for this type of grass.

It's important to note that pre-emergent weed killers work by preventing weed seeds from germinating, so you need to apply them before the weeds have a chance to grow. The best time to apply pre-emergent weed killer on St. Augustine grass is in the spring, before the weeds start to germinate.

When choosing a pre-emergent herbicide for St. Augustine grass, look for products that contain active ingredients like dithiopyr, prodiamine, or pendimethalin. These ingredients are safe for St. Augustine grass and will effectively prevent weeds from growing.

Always read and follow the label instructions carefully before applying any herbicide to your lawn, including pre-emergent weed killers. This will ensure that you apply the product correctly and safely.

Can I use a weed and feed product on St. Augustine grass?

Yes, you can use a weed and feed product on St. Augustine grass. However, it is important to use a weed and feed product that is specifically formulated for St. Augustine grass. This is because St. Augustine grass has different nutrient and chemical needs than other types of grasses. Using the wrong type of weed and feed product can harm your St. Augustine grass and even kill it.

Before using a weed and feed product on your St. Augustine grass, it is important to read the instructions carefully and follow them exactly. You should also make sure that the product is safe for pets and children, as some weed and feed products can be harmful if ingested.

It is also important to note that while weed and feed products can be effective at controlling weeds and promoting healthy grass growth, they should not be used as a substitute for proper lawn care practices such as regular mowing, watering, and fertilizing.

How do I apply weed killer to my St. Augustine lawn for maximum effectiveness?

To apply weed killer to your St. Augustine lawn for maximum effectiveness, you need to follow a few steps. Firstly, choose the right type of weed killer that is safe for St. Augustine grass. Then, read and follow the instructions on the label carefully before applying it. Check the weather forecast to ensure that there is no rain or strong winds for at least 24 hours after application. This will allow the weed killer to be absorbed by the weeds and not washed away.

Next, apply the weed killer evenly across your lawn using a sprayer or spreader. Be sure not to spray or spread beyond the edges of your lawn to avoid damaging nearby plants.

After application, wait for a few days to see the results. If the weeds are still present, you may need to apply another round of weed killer, but be sure to wait at least two weeks before doing so.

It's important to note that weed killers can be harmful to humans and pets, so be sure to keep them away from the treated area until it's safe to return. Also, it's recommended to wear protective clothing and gloves while applying weed killers.

How do I choose the right weed killer for my St. Augustine lawn?

Choosing the right weed killer for your St. Augustine lawn can be a daunting task. It is important to choose a weed killer that is safe for your lawn while effectively controlling weeds. The first step is to identify the type of weeds in your lawn. This will help you choose a weed killer that is specifically designed to target those types of weeds. Look for herbicides that are labeled safe for use on St. Augustine grass.

Next, consider the application method. There are different types of weed killers available, including liquid sprays, granules, and concentrated formulas. Choose a weed killer that is easy to apply and fits your needs. Some products may require multiple applications, while others may provide long-lasting control with a single treatment.

It is also important to consider safety. Make sure to read and follow all instructions on the label carefully. Wear protective clothing and use gloves when handling weed killers. Keep pets and children away from treated areas until the product has dried.

Lastly, consider the environmental impact of the weed killer. Look for products that are eco-friendly and safe for the environment. Choose a weed killer that is not harmful to beneficial insects or wildlife.

Overall, choosing the right weed killer for your St. Augustine lawn requires careful consideration of the type of weeds, application method, safety, and environmental impact.

How often should I apply weed killer to my St. Augustine lawn?

The frequency of weed killer application on St. Augustine grass depends on various factors such as the type of weed killer used, the severity of the weed infestation, and the time of the year. Typically, it is recommended to apply weed killer to St. Augustine grass in the spring and fall seasons. However, if the weed infestation is severe, you may need to apply the weed killer more frequently.

It is important to follow the instructions on the weed killer product label carefully, as over-application can damage or even kill your St. Augustine grass. Generally, it is recommended to apply weed killer every 4-6 weeks during the growing season, which is typically from April to September. During the dormant season, which is from October to March, you may only need to apply weed killer once or twice.

It is also important to note that prevention is key to keeping weeds at bay in your St. Augustine lawn. Maintaining proper lawn care practices such as regular mowing, watering, and fertilizing can help prevent weed growth.

What are the best weed killers for St. Augustine grass?

St. Augustine grass is a popular type of lawn grass, but it can be particularly vulnerable to weed invasions. To keep your lawn healthy and weed-free, you need to choose the right weed killer. Here are some of the best weed killers for St. Augustine grass:

1. Atrazine: This is a popular herbicide that is specifically designed for St. Augustine grass. It is a selective herbicide, which means it only targets certain types of weeds and will not harm your grass.

2. 2,4-D: This is another selective herbicide that works well on St. Augustine grass. It is effective against a wide range of broadleaf weeds and is safe to use on most types of lawn grass.

3. Glyphosate: This is a non-selective herbicide that can be used to kill all types of weeds, including those that are difficult to control. However, it can also harm your St. Augustine grass, so it should be used with caution.

4. Imazaquin: This is a pre-emergent herbicide that is effective at preventing the growth of certain weeds. It is safe to use on St. Augustine grass and can help keep your lawn weed-free.

When choosing a weed killer for St. Augustine grass, it is important to read the labels carefully and follow the instructions closely to ensure that you are using the product safely and effectively.

What are the most common weeds found in St. Augustine grass and how do I get rid of them?

St. Augustine grass is a popular warm-season turfgrass that grows well in the southern United States. However, like any other grass, it can be susceptible to weed growth. Some of the most common weeds that can invade St. Augustine grass include broadleaf weeds such as clover, dandelion, and chickweed, as well as grassy weeds such as crabgrass and dallisgrass.

To get rid of these weeds, there are several methods you can use. One option is to manually pull them out by hand, but this can be time-consuming and may not remove the entire root system. Another option is to use a selective herbicide that targets the specific type of weed you are dealing with. Be sure to read and follow the instructions carefully to avoid damaging your St. Augustine grass.

It's also important to maintain a healthy lawn by regularly fertilizing and watering your grass, as a healthy lawn can better resist weed growth. Additionally, mowing your lawn at the correct height can prevent weed seeds from germinating and spreading. Overall, a combination of manual removal, herbicide use, and good lawn maintenance practices can help keep weeds at bay in your St. Augustine grass.

What are the most effective natural weed killers for St. Augustine grass?

There are several natural weed killers that can be effective for St. Augustine grass. One of the most popular options is vinegar. The acetic acid in vinegar can kill weeds by drying out their leaves. Mix white vinegar with water in a 1:1 ratio and add a few drops of dish soap to help the solution stick to the weeds. Another natural option is boiling water. Pouring boiling water directly onto weeds can kill them by destroying their cell structure. However, be careful not to pour boiling water onto your grass, as it can also damage it. Corn gluten meal is another natural weed killer that can also act as a fertilizer for your lawn. It works by preventing weed seeds from germinating. Finally, hand-pulling weeds is always an effective and natural option, although it can be time-consuming. Whichever method you choose, be sure to apply it carefully and selectively to avoid damaging your St. Augustine grass.

What are the potential risks and side effects of using weed killers on St. Augustine grass?

Weed killers, also known as herbicides, can be effective in controlling unwanted weeds in St. Augustine grass. However, they also come with potential risks and side effects that need to be considered. One of the main risks is that some herbicides can damage or kill St. Augustine grass along with the weeds. This can happen if the herbicide is not applied properly or if the grass is not tolerant to the specific herbicide being used.

Another potential risk is that herbicides can be harmful to the environment, particularly if they are not used correctly or if they are applied in excessive amounts. Some herbicides can contaminate soil and water sources, which can have negative impacts on wildlife and human health.

In terms of side effects, herbicides can cause skin irritation, respiratory problems, and other health issues if they come into contact with the skin or are inhaled. Additionally, some herbicides can leave behind residues that can be harmful to pets and children who play on the treated grass.

To minimize these risks and side effects, it is important to carefully read and follow the instructions on the herbicide label, wear protective gear when applying the herbicide, and avoid over-applying the product. It is also recommended to choose herbicides that are specifically formulated for use on St. Augustine grass to ensure that the product is safe and effective for this type of turf.