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Best Crabgrass Killer Post Emergent (2025 Update)

If you're looking for an effective way to eliminate crabgrass from your garden or lawn, then you'll definitely want to consider investing in a post-emergent crabgrass killer. However, choosing the right crabgrass killer can be a bit tricky, as there are a number of different products available on the market. In order to make the best decision for your needs, there are a few key factors you should consider.

First off, it's important to think about the size of the area you'll be treating with the crabgrass killer. If you have a large lawn or garden, you may want to opt for a product that comes in a concentrate form, as this will allow you to mix up a larger batch of the solution. Additionally, you'll want to think about your budget and how much you're willing to spend on this product. While prices can vary widely, you don't always get what you pay for, so it's important to do your research before committing to a specific product.

If you're still unsure which crabgrass killer to choose, you may want to ask yourself a few questions to help narrow down your options. For example, do you prefer an eco-friendly solution, or are you more concerned with getting the job done quickly and effectively? Are you willing to reapply the crabgrass killer as needed, or are you looking for a single application solution? By considering these questions and weighing your options carefully, you can find the perfect post-emergent crabgrass killer to meet your needs and keep your lawn or garden looking great all season long.

10 Best Crabgrass Killer Post Emergent

# Product Image Product Name Product Notes Check Price
1
The product is ideal for killing unwanted weeds and other types of grass in lawns and gardens.
2
Ideal for selective control of weeds in cool and warm season turfgrasses on residential and commercial properties.
3
It is ideal for controlling crabgrass and other types of weeds in lawns and other outdoor spaces.
4
This product is ideal for controlling weeds in lawns throughout the entire growing season.
5
Ideal for killing weeds in lawns and gardens with a ready-to-spray formula.
6
Ideal for preventing crabgrass growth on lawns up to 5,000 sq. ft.
7
Ideal for killing weeds and crabgrass in lawns.
8
It is ideal for killing and preventing the growth of crabgrass and weeds in lawns.
9
This product is ideal for killing crabgrass and weeds quickly and safely without harming the environment.
10
Ideal for killing weeds and preventing crabgrass in lawns and landscape areas, ready-to-spray formula for easy application.
The product is ideal for killing unwanted weeds and other types of grass in lawns and gardens.
Ideal for selective control of weeds in cool and warm season turfgrasses on residential and commercial properties.
It is ideal for controlling crabgrass and other types of weeds in lawns and other outdoor spaces.
This product is ideal for controlling weeds in lawns throughout the entire growing season.
Ideal for killing weeds in lawns and gardens with a ready-to-spray formula.
Ideal for preventing crabgrass growth on lawns up to 5,000 sq. ft.
It is ideal for killing and preventing the growth of crabgrass and weeds in lawns.
This product is ideal for killing crabgrass and weeds quickly and safely without harming the environment.
Ideal for killing weeds and preventing crabgrass in lawns and landscape areas, ready-to-spray formula for easy application.

1. Hi Yield 16 Oz Grass Killer

Introducing a powerful post-emergent herbicide that selectively targets and eliminates unwanted grass growth. This product is specifically designed to work quickly and efficiently, providing effective results in just two days following application.

With its versatile application, this herbicide can be safely used around vegetables, gardens, trees, shrubs, and ornamentals without causing any damage to the surrounding area.

One of the standout features of this herbicide is its potent concentration, allowing users to make up to 16 gallons of spray solution with just one bottle. This makes it an incredibly cost-effective solution for those looking to maintain a pristine garden or landscape without breaking the bank.

When it comes to application, users should refer to the label for specific instructions based on the dimensions and desired application method. This ensures optimal results and safety for both the user and the environment.

2. Quali-Pro Quinclorac 75 Df Selective Herbicide 1lb

The product at hand is a highly effective herbicide that can be used on commercial and residential turfgrass, golf courses, sports fields, and sod farms. It is specifically designed to combat a variety of stubborn weeds, including crabgrass, clover, foxtail, dandelion, black medic, English daisy, morning glory, dollarweed, speedwell, torpedograss, kikuyugrass, barnyardgrass, bindweed, signalgrass, and violet.

One of the key features of this product is its active ingredient, quinclorac 75%, which has been proven to effectively kill even the toughest of weeds. Its potent formula works quickly and efficiently to target weeds at their roots, ensuring that they do not grow back.

The product is easy to use and can be applied to large areas of turfgrass with ease. It is also safe and non-toxic, making it an ideal choice for those who are environmentally conscious. Additionally, it is highly versatile and can be used on a variety of different surfaces without causing any damage to the underlying substrate.

3. Ortho Weed B Gon Plus Crabgrass Control Concentrate2, 32 Oz.

Looking for a reliable solution to keep your lawn weed-free? Look no further than this high-quality weed killer. With its powerful formula, this product is designed to effectively kill crabgrass, dandelions, and a wide variety of other common lawn weeds.

One of the key benefits of this weed killer is that it kills weeds to the roots, ensuring that they won't grow back. In fact, this product is capable of killing over 200 different types of weeds, making it a versatile choice for anyone looking to maintain a healthy, attractive lawn.

Another major advantage of this weed killer is that it won't harm your lawn when used as directed. Thanks to its specially designed formula, you can rest assured that your grass will stay healthy and green, even as the weeds are eliminated.

And best of all, this weed killer starts working right away, so you can enjoy a weed-free lawn in no time. So why wait? Try this powerful weed killer today and enjoy a beautiful, healthy lawn all season long.

4. Bioadvanced Season Long Weed Control For Lawns, Ready-To-Spray, 29 Oz, 9,000 Sq Ft

Introducing a powerful weed control solution that eliminates pesky weeds and prevents them from coming back! This 2-in-1 formula is designed to kill existing lawn weeds while also preventing listed weeds from emerging.

Experience long-lasting weed protection with this proprietary formula that effectively kills and prevents weeds for up to 6 months. With just one application, you can enjoy a weed-free lawn without the hassle of frequent reapplication.

Say goodbye to stubborn weeds like Dandelion, Dollarweed, and Clover. This potent weed killer takes care of them all, leaving your lawn looking healthy and vibrant.

Don't let unpredictable weather interfere with your lawn care routine. This weed control solution is rainproof in just 1 hour, ensuring your lawn remains protected even during unexpected rain showers.

Invest in a reliable weed control solution that delivers results. With this 2-in-1 formula, you can easily eliminate weeds and prevent them from coming back, all while enjoying a lush and beautiful lawn.

5. Bonide 066 916126 Weed Beater Plus Ready-To-Spray, 32 Oz

This herbicide spray is a powerful solution to control weeds in your lawn. With the ability to kill over 200 different types of lawn weeds, it provides an easy and effective way to maintain a healthy lawn. The product is specially formulated to be safe for grass, killing weeds down to the root without harming your lawn when used as directed. However, it is not recommended for St. Augustine or Centipede grass types.

Designed for post-emergent weed control, this product is intended for use after weeds have already sprouted. It works by entering the weeds through their leaves and moving inside, eventually down to their roots. This ensures that the weeds are completely eliminated and do not regrow.

The 32 oz. container is equipped with a garden hose nozzle, which connects directly to your garden hose, making application a breeze. As you apply the spray to desired areas, the product mixes automatically with the water, ensuring even coverage. One quart of this herbicide spray can cover up to 6,600 square feet, providing industrial strength coverage with just one container.

6. Preen 2464064 Crabgrass Control Lawn, 15 Lb, Covers 5,000 Sq. Ft

This product is the ultimate solution for lawn care enthusiasts who want to prevent crabgrass while also controlling other weeds. It provides up to four weeks of prevention of crabgrass seedlings and controls or suppresses other listed weeds that may germinate. This season-long weed control can be applied later in the spring and is effective against tough lawn weeds such as crabgrass, chickweed, henbit, yellow foxtail, and spurge.

To use this product, it is important to apply it only to established lawns and ornamentals. It is suitable for use on both warm and cool season turfgrasses, including bermudagrass, centipedegrass, St. Augustinegrass, buffalograss, bahiagrass, carpetgrass, zoysiagrass, Kentucky bluegrass, perennial ryegrass, tall fescue, fine fescue, creeping bentgrass, and turf-type tall fescues.

For optimal results, apply using a drop or rotary spreader designed to apply granular fertilizers and apply the product evenly. After application, it is recommended to avoid mowing the turfgrass area for a few days to allow the product to settle in. Additionally, it is important to ensure the product is activated by rainfall or water within 30 days of application.

7. Bioadvanced All-In-One Lawn Weed And Crabgrass Killer I, Concentrate, 40 Oz

BioAdvanced has developed an all-in-one formula that effectively eliminates listed lawn weeds and crabgrass without causing any damage to the lawn. This weed killer is able to target over 200 types of broadleaf weeds such as dandelion and clover, as well as crabgrass.

One of the unique features of this product is the SmartTrack non-staining red marker that is included. This marker helps users to identify the areas where they have treated weeds, and fades with sunlight over time. This ensures that users do not treat the same area twice and can keep track of their progress.

Another benefit of this product is its rainproof protection, which takes effect just one hour after application. This means that users can apply the product with confidence, even if there is a chance of rain in the forecast.

8. Bonide Products 60490 917453 Crabgrass Weed Killer

Looking for a reliable solution to keep your lawn free from weeds? Look no further than this product, which is specifically designed to eliminate many types of weeds that can plague your lawn. Whether you're dealing with crabgrass or broadleaf weeds, this dual-action product is up to the task.

One of the key advantages of this product is its versatility. Unlike many other products on the market, which are designed for use in commercial or industrial settings, this product is specifically designed for home lawn use. This makes it ideal for homeowners who want to keep their lawns looking their best without having to hire a professional landscaper.

Another key advantage of this product is its coverage. With a range of up to 5,000 square feet, it can cover a wide area with ease, making it an ideal choice for those with larger lawns or who want to tackle multiple areas at once.

Of course, the real selling point of this product is its effectiveness. Thanks to its dual-action formula, it not only prevents the growth of crabgrass and other listed broadleaf weeds, but it also kills them on contact, ensuring that your lawn stays looking its best for longer.

9. Agralawn Crabgrass Killer, Fast-Acting 2 Lb Bottle, Naturally Safer Weed Killer

The product is specially designed to be safe and effective on a variety of grass types including St. Augustine, Common Bermuda, Bahia, and Centipede. When used correctly, it has minimal impact on the appearance and health of the grasses listed above. By being absorbed through the leaves, this product targets both weeds and roots, providing thorough and efficient coverage.

This product is exempt from EPA registration under the Federal Insecticide, Fungicide, and Rodenticide Act, Section 25(b) rule. This means that it has undergone rigorous testing and meets strict safety standards for use in residential and commercial settings.

One of the standout features of this product is its ability to eliminate unwanted weeds without harming St. Augustine grass. This makes it a go-to choice for homeowners and landscapers who want to maintain the beauty and health of their lawns.

As a post-emergent solution, this product is designed to be applied after weeds have already sprouted. This allows for targeted treatment and maximum effectiveness, making it an ideal choice for those looking to rid their lawns of unwanted growth.

10. Ortho 9994110 Weed B Gon Plus Crabgrass Control Ready-To-Spray2, 32. Oz

This powerful weed killer is designed to eliminate crabgrass, dandelions, and other common lawn weeds with ease. It works by targeting the roots, ensuring that the weeds are completely eradicated from your lawn. With the ability to kill over 200 different types of weeds, this product is a must-have for any homeowner looking to maintain a lush, weed-free lawn.

One of the standout features of this weed killer is that it won't harm your lawn, as long as it is used as directed. This guarantee provides peace of mind for homeowners who want to keep their lawn looking its best without causing any damage to the grass. Additionally, this product starts working immediately, so you can see results quickly and effectively.

Whether you're dealing with pesky crabgrass or unwanted dandelions, this weed killer is the solution you've been looking for. Its powerful formula targets weeds at the root, ensuring that they won't grow back. Best of all, it won't harm your lawn, providing a safe and effective solution for all your weed-killing needs.

Best Crabgrass Killer Post Emergent FAQs

Are there any natural or organic post-emergent crabgrass killers available?

Yes, there are several natural or organic post-emergent crabgrass killers available in the market. Crabgrass is a common weed that can be difficult to eradicate as it spreads quickly and forms a thick mat of roots. However, using natural or organic crabgrass killers can be an effective way to control its growth without harming the environment.

One of the most popular natural crabgrass killers is vinegar. Vinegar contains acetic acid, which can burn and dry out the leaves and roots of the crabgrass. To use vinegar as a crabgrass killer, mix it with water and spray the solution on the weed.

Another effective natural crabgrass killer is corn gluten meal. It is a byproduct of corn processing and contains proteins that inhibit the growth of crabgrass roots. Corn gluten meal is also a good source of nitrogen, which can help fertilize the soil.

Other natural and organic post-emergent crabgrass killers include clove oil, cinnamon oil, and citrus oil. These essential oils contain compounds that can kill the weed without harming the surrounding plants.

In conclusion, natural and organic post-emergent crabgrass killers are available in the market and can be an effective way to control the growth of crabgrass without harming the environment.

Can a post-emergent crabgrass killer also kill other types of weeds?

Yes, a post-emergent crabgrass killer can also kill other types of weeds, depending on the type of active ingredient it contains. Some post-emergent herbicides contain selective ingredients that only target specific types of weeds, while others contain non-selective ingredients that can kill any plant they come into contact with.

For instance, post-emergent herbicides that contain quinclorac or fenoxaprop-ethyl are selective and mainly target grassy weeds like crabgrass, foxtail, and goosegrass, leaving other broadleaf weeds unharmed. On the other hand, herbicides that contain glyphosate or glufosinate-ammonium are non-selective and can kill any plant they touch, including broadleaf weeds, grassy weeds, and even trees and shrubs.

When choosing a post-emergent herbicide, it's essential to read the label carefully to determine the active ingredient and the types of weeds it targets. Also, ensure that the herbicide is safe for use on your lawn or garden plants and follow the manufacturer's instructions for application and safety precautions.

How do I choose the best post-emergent crabgrass killer for my specific lawn or garden needs?

When it comes to choosing the best post-emergent crabgrass killer, there are several factors to consider. Firstly, you need to identify the type of grass you have in your lawn or garden as some post-emergent crabgrass killers may harm certain types of grass. Secondly, you need to consider the severity of the crabgrass infestation. If it's a small infestation, a selective herbicide may be sufficient, but for a larger infestation, a non-selective herbicide may be necessary.

You should also take into account the effectiveness of the product and its safety for use around pets and children. Look for products that are labeled as safe for use on lawns and gardens and that have been tested and proven to be effective.

Another important factor to consider is the method of application. Some post-emergent crabgrass killers come in sprays or granules, while others need to be mixed with water and sprayed. Make sure to choose a product that is easy to apply and fits with your specific needs.

Ultimately, the best post-emergent crabgrass killer for your lawn or garden will depend on your specific needs and preferences. Research products carefully and consult with a professional if you have any doubts or concerns.

How often should a post-emergent crabgrass killer be applied to control crabgrass?

The frequency of applying post-emergent crabgrass killer depends on the severity of the crabgrass infestation. Generally, it is recommended to apply the herbicide when the crabgrass is actively growing and before it starts producing seeds. This usually occurs in late spring and early summer when the soil temperature reaches 55-60 degrees Fahrenheit.

If the infestation is severe, a second application may be necessary after 4-6 weeks. However, it is important to follow the instructions on the product label carefully as overuse can damage the lawn and surrounding plants. Additionally, it is important to note that prevention is key in controlling crabgrass. Maintaining a healthy lawn through proper watering, fertilization, and mowing practices can help prevent crabgrass from taking over in the first place.

How quickly does a post-emergent crabgrass killer work?

Post-emergent crabgrass killers work at different rates depending on the specific product and environmental conditions. However, most post-emergent crabgrass killers start to show results within a few days. The herbicide works by being absorbed into the weed and traveling down to the root system to kill the plant. Once absorbed, the herbicide will begin to break down the plant's cell walls and disrupt its ability to photosynthesize, causing it to die. However, it is important to note that some crabgrass plants may require multiple applications of the herbicide to completely eradicate them. Additionally, the effectiveness of the herbicide can be influenced by factors such as temperature, humidity, and rainfall. Therefore, it is recommended to carefully follow the instructions provided with the product and monitor the treated area closely to determine the effectiveness of the herbicide.

Is a post-emergent crabgrass killer safe to use on all types of turf?

Post-emergent crabgrass killers are designed to eliminate crabgrass once it has already emerged. These products are generally safe to use on most types of turf, but it is important to read the label carefully to ensure that the product is appropriate for the specific type of turf you have.

Different types of turf have varying tolerances to herbicides, and some may be more sensitive to certain chemicals or application rates than others. Additionally, some post-emergent crabgrass killers may contain other ingredients that could harm your turf if applied improperly.

To ensure the safety and effectiveness of a post-emergent crabgrass killer on your turf, it is best to consult with a professional lawn care provider or read the product label carefully before use. Additionally, following proper application and safety guidelines, such as wearing protective clothing and keeping children and pets away from treated areas, can help to minimize any potential risks.

What are the active ingredients in the best post-emergent crabgrass killers?

The best post-emergent crabgrass killers contain active ingredients that are effective in killing crabgrass without harming the surrounding turfgrass. There are several active ingredients that have been proven to be effective, including quinclorac, fenoxaprop-p-ethyl, mesotrione, and sulfentrazone.

Quinclorac is a selective herbicide that is effective in killing crabgrass and other broadleaf weeds. It works by disrupting the growth and development of the weed, causing it to wither and die.

Fenoxaprop-p-ethyl is another selective herbicide that is effective in killing crabgrass and other grassy weeds. It works by inhibiting the production of a specific enzyme in the weed, which ultimately leads to its death.

Mesotrione is a non-selective herbicide that is effective in killing crabgrass and other broadleaf weeds. It works by inhibiting the production of a specific protein in the weed, which ultimately leads to its death.

Sulfentrazone is another non-selective herbicide that is effective in killing crabgrass and other broadleaf weeds. It works by disrupting the cell membranes of the weed, causing it to wither and die.

When choosing a post-emergent crabgrass killer, it is important to read the label carefully to ensure that it contains one or more of these active ingredients and to follow the application instructions closely to ensure effective and safe use.

What is the best post-emergent crabgrass killer?

When it comes to post-emergent crabgrass killers, there are a variety of options available on the market. The best one for you will depend on several factors, including the severity of the crabgrass infestation and the type of lawn or garden you have. Some of the most effective post-emergent crabgrass killers include products that contain active ingredients such as quinclorac, mesotrione, or dithiopyr. These ingredients work by targeting the crabgrass and killing it at the root, preventing it from spreading.

One popular post-emergent crabgrass killer is Tenacity, which contains mesotrione and can also be used to control other broadleaf weeds. Another effective option is Drive XLR8, which contains quinclorac and is designed to work quickly to kill crabgrass. It's important to carefully follow the instructions on any post-emergent crabgrass killer product, as overuse or improper application can damage your lawn or garden. Ultimately, the best post-emergent crabgrass killer for you will depend on your specific needs and preferences.

What is the best time of year to apply a post-emergent crabgrass killer?

The best time of year to apply a post-emergent crabgrass killer depends on the type of product you are using. For most post-emergent herbicides, it is recommended to apply them in the late spring or early summer when the crabgrass has already emerged and is actively growing. This is usually around the time when soil temperatures reach 55-60 degrees Fahrenheit.

It is important to follow the instructions on the label of the specific product you are using, as some may have different recommendations for timing and application. Additionally, it is important to make sure that the crabgrass is not in its early stages of growth, as the herbicide may not be as effective.

Overall, the best time to apply a post-emergent crabgrass killer is when the crabgrass is actively growing and has already emerged, but before it has had a chance to spread and produce seeds. This will help to ensure the most effective control of the weed.

Will a post-emergent crabgrass killer harm beneficial plants in my lawn or garden?

Post-emergent crabgrass killers are designed to eliminate crabgrass weeds without harming other plants in your lawn or garden. However, it is important to read and follow the manufacturer's instructions carefully to ensure that you use the product correctly.

While post-emergent crabgrass killers are generally safe for most grasses and plants, they can be harmful if used improperly. For example, if you apply the product too heavily or too frequently, it can damage or kill your grass and other plants.

To avoid any potential harm to your beneficial plants, it is recommended that you spot-treat the crabgrass with the post-emergent weed killer instead of applying it over the entire lawn or garden. This will help to minimize any potential damage to your other plants.

Additionally, it is important to avoid applying the product on a windy day, as the spray can drift and damage nearby plants. Overall, if used correctly, post-emergent crabgrass killers should not harm your beneficial plants in your lawn or garden.