Tired of unwanted weeds ruining your perfectly manicured lawn or garden? Post-emergent weed killers offer a targeted solution, attacking weeds after they’ve already sprouted.
However, navigating the sheer number of options available can be overwhelming. Choosing the best post emergent weed killers requires careful consideration, as effectiveness varies greatly depending on the weed type, grass species, and environmental conditions.
This article aims to simplify your search. We understand the importance of achieving a weed-free space without damaging your desired plants.
Selecting quality and value products is crucial for both your lawn’s health and your wallet. We’ll explore the key factors to consider, helping you make an informed decision and ultimately find the best post emergent weed killers for your specific needs.
IN THIS ARTICLE
Top 5 Post Emergent Weed Killers Compared
Jonathan Green (12195) Lawn Weed Control – Post Emergent Broadleaf Weed Killer (5
- Covers up to 5000 square feet effectively.
- Liquid form ensures easy and even application.
- Contains Trimec for powerful weed control.
- Generous 160 ounce unit count provided.
3.9/5
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Southern Ag Amine 2
- Covers a large area, up to 5000 square feet.
- Effective active ingredient: Dimethylamine salt of 2,4-D.
- Convenient liquid form for easy application.
- Trusted brand: Southern Ag, reliable manufacturer.
4.4/5
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Ortho WeedClear Lawn Weed Killer Ready-To-Spray
- Covers a large area, up to 5000 square feet.
- Convenient spray form for easy application.
- Trusted brand: Ortho, made in the USA.
- Lightweight at only 2 pounds, easy to handle.
4.0/5
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Scotts Weed Control for Lawns
- Treats 5000 square feet effectively.
- Granular form for easy application.
- Contains three active weed-killing ingredients.
- Trusted brand: Scotts, made in the USA.
3.9/5
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Scotts Turf Builder Triple ActionI
- Three-in-one formula simplifies lawn care
- Controls many common lawn weeds effectively
- Prevents crabgrass and other grassy weeds
- Feeds grass for a thick, green lawn
4.3/5
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Detailed Reviews of the Best Post Emergent Weed Killers
Jonathan Green (12195) Lawn Weed Control – Post Emergent Broadleaf Weed Killer (5 – Covers up to 5000 square feet effectively.
Premium Jonathan Green weedkiller offers exceptional lawn transformation, turning weed-infested areas into a lush, carpet-like expanse. While complete weed eradication is a natural impossibility due to external factors like windblown seeds, this product ensures a significantly reduced weed presence, making it a reliable solution for achieving a visibly cleaner lawn. Its effectiveness extends to even resilient weeds like clover, providing comprehensive weed control.
For optimal results, it’s recommended to apply the weedkiller after mowing, ideally in the morning when the lawn is damp with dew, facilitating adherence to the weeds. If morning application isn’t feasible, lightly watering the lawn beforehand is advisable. Ensuring a 48-hour rain-free window post-application is crucial, followed by thorough watering to dissolve the granules completely.
The application strategy can be adjusted based on the severity of the weed problem. Initially, a higher application rate may be necessary for heavily infested lawns, gradually reducing it in subsequent years as weed density decreases. This adaptability makes it suitable for both initial weed control and ongoing maintenance, ensuring a consistently healthy and weed-free lawn with minimal effort.
Pros
- Covers up to 5000 square feet effectively.
- Liquid form ensures easy and even application.
- Contains Trimec for powerful weed control.
- Generous 160 ounce unit count provided.
Cons
- Granules need precise application
- Must avoid rain after application
Southern Ag Amine 2 – Covers a large area, up to 5000 square feet.
I’ve been using this product with great success at a dilution of 5 teaspoons per 2 gallons of water (approximately half a shot glass). This dilution effectively eliminates a wide range of broadleaf weeds, including thistle, burr buttercup, and dandelions, among others. One of the most significant advantages is that it selectively targets weeds without harming native grasses or other desired grass species.
This is a major improvement over other products, such as R—D _P, which can sterilize the soil, preventing any plant life from returning. The product is highly concentrated, meaning a little bit goes a long way, making it a cost-effective solution for weed control. For optimal application, I recommend using a fast movement and medium spray setting, which ensures even coverage.
It performs well even in light wind conditions and is most effective when applied in sunny weather. Expect to see fast results as the product quickly targets and eliminates unwanted weeds.
Pros
- Covers a large area, up to 5000 square feet.
- Effective active ingredient: Dimethylamine salt of 2,4-D.
- Convenient liquid form for easy application.
- Trusted brand: Southern Ag, reliable manufacturer.
Cons
- Here are two cons based on the review:
- May require careful measuring
Ortho WeedClear Lawn Weed Killer Ready-To-Spray – Covers a large area, up to 5000 square feet.
Honest: This product is a reliable solution for weed control, evidenced by repeat purchases. Its effectiveness surpasses that of other brands, providing a targeted approach that eliminates weeds without harming desirable grasses. While not the fastest-acting solution, it offers a gentle yet powerful approach, causing weeds to wilt within days and completely disappear within a few weeks, leaving a clean, weed-free space.
A significant advantage of this product is its ability to eradicate difficult weeds, including prickly varieties like thistles. Unlike manual removal which often exacerbates the problem, this solution targets the entire plant, significantly reducing regrowth and ultimately leading to complete elimination. This is particularly beneficial for those seeking to maintain a pristine lawn free from troublesome, thorny weeds.
The product features a convenient, battery-operated sprayer, eliminating the need for manual pumping and ensuring ease of use. Its intuitive design allows for quick setup and operation, with clear instructions readily available if needed. The size is designed for optimal coverage without being cumbersome, making it suitable for treating large areas efficiently.
The value proposition is exceptional, offering a cost-effective alternative to professional lawn care services, while also granting the ability to selectively target weeds, preserving desirable plants.
Pros
- Covers a large area, up to 5000 square feet.
- Convenient spray form for easy application.
- Trusted brand: Ortho, made in the USA.
- Lightweight at only 2 pounds, easy to handle.
Cons
- Takes a long time to fully work
- Plant removal leaves empty spaces
Scotts Weed Control for Lawns – Treats 5000 square feet effectively.
Surprising how effectively this product tackles weed control. It’s noted for being easy to use and delivering on its core function of eliminating unwanted plants. The product demonstrates its ability to eradicate dandelions and clover effectively.
A low application setting ensures the product adheres to the weeds, maximizing its impact. Post-application observation reveals a significant reduction in weeds within a relatively short period. One of the key advantages highlighted is its targeted action.
The product kills weeds without affecting the grass, promoting normal growth without causing any burns or damage. This selective action ensures that the desired vegetation remains healthy and vibrant. The product offers long-lasting weed control, with the absence of new weeds observed for an extended period.
This sustained effectiveness minimizes the need for frequent reapplication, saving time and effort.
Pros
- Treats 5000 square feet effectively.
- Granular form for easy application.
- Contains three active weed-killing ingredients.
- Trusted brand: Scotts, made in the USA.
- Large 224-ounce unit count provides value.
Cons
- Here are two cons based on the review:
- Weeds may require repeat application
Scotts Turf Builder Triple ActionI – Three-in-one formula simplifies lawn care
My experience with Scotts Turf Builder Weed Killer, Crabgrass Preventer, and Lawn Fertilizer has been exceptional, resulting in a visibly healthier and more attractive lawn. This product excels at its primary function: effectively eliminating existing weeds and providing reliable crabgrass prevention. The formula ensures a weed-free lawn, offering long-lasting protection against unwanted growth throughout the season.
Beyond weed control, the product significantly enhances the overall health and appearance of the grass. The fertilizer component revitalizes the lawn, promoting lush, green growth. This leads to a noticeably improved lawn that becomes the envy of the neighborhood.
The product is also designed for ease of use, with clear and straightforward instructions that simplify the application process. Even those with limited lawn care experience can achieve professional-quality results. Furthermore, the formula offers long-lasting effectiveness, reducing the need for frequent reapplication and saving both time and money.
Overall, Scotts Turf Builder Weed Killer, Crabgrass Preventer, and Lawn Fertilizer transforms lawns into vibrant, attractive outdoor spaces. It is a highly effective and user-friendly solution for achieving a picture-perfect lawn that remains healthy and beautiful season after season.
Pros
- Three-in-one formula simplifies lawn care
- Controls many common lawn weeds effectively
- Prevents crabgrass and other grassy weeds
- Feeds grass for a thick, green lawn
Cons
- Bulky bag, hard to store
- Strong scent during application
Buying Guide: What to Look For in a Post Emergent Weed Killers
Understanding Post-Emergent Weed Killers
Post-emergent weed killers are herbicides designed to target weeds that have already sprouted and are actively growing in your lawn. Choosing the best post emergent weed killers requires understanding your lawn type, the specific weeds you’re dealing with, and the application method that best suits your needs. Identifying the weeds accurately is crucial, as different herbicides are formulated to control different species. Consider whether you need a broadleaf weed killer, a grassy weed killer, or a product that handles both.
Types of Post-Emergent Weed Killers
Post-emergent weed killers come in various formulations, including liquid concentrates, ready-to-spray liquids, and granular options. Liquid concentrates require mixing with water and are often more economical for larger areas. Ready-to-spray liquids offer convenience for smaller areas or spot treatments. Granular herbicides are applied with a spreader and can be effective for pre and post-emergent control, depending on the active ingredients. Understanding the pros and cons of each type will help you select the best post emergent weed killers for your lawn.
Factors to Consider When Choosing
Several factors influence the effectiveness and suitability of a post-emergent weed killer. Lawn type is critical; some herbicides can damage certain grass species. Active ingredients play a significant role; Trimec, Dimethylamine salt of 2,4-D, and other combinations offer varying levels of control. Coverage area is important; ensure the product can treat the size of your lawn. Application method (spray vs. granular) should match your comfort level and equipment. Finally, consider the brand’s reputation and the product’s safety profile. Selecting the best post emergent weed killers involves carefully weighing these factors.
Application Techniques for Optimal Results
Proper application is key to achieving effective weed control with post-emergent herbicides. Always read and follow the product label instructions carefully. Apply the herbicide on a calm day to minimize drift. Avoid applying when rain is expected, as it can wash away the product before it has a chance to work. Use the recommended application rate; over-application can damage your lawn, while under-application may not effectively control the weeds. For liquid herbicides, use a calibrated sprayer to ensure even coverage. Proper application of best post emergent weed killers is essential for maximizing their effectiveness.
Safety Precautions
When using any herbicide, prioritize safety. Wear appropriate protective gear, such as gloves, eye protection, and long sleeves. Keep children and pets away from the treated area until it is dry. Store herbicides in a secure location, out of reach of children and pets. Dispose of empty containers properly, following the manufacturer’s instructions. Be mindful of the environmental impact of herbicides and choose products that are environmentally responsible. Always handle best post emergent weed killers with care and follow all safety guidelines.
Frequently Asked Questions about Post Emergent Weed Killers
What are the key differences between pre-emergent and post-emergent weed killers?
Pre-emergent weed killers prevent weed seeds from germinating, creating a barrier in the soil that stops new weeds from sprouting. They are typically applied in early spring and fall. Post-emergent weed killers, on the other hand, target weeds that have already emerged and are actively growing. Post-emergent products are applied directly to the visible weeds to kill them. Choosing between the two depends on whether you are trying to prevent weeds or eliminate existing ones. Often, a combination of both is the most effective strategy for weed control.
How do I identify the weeds in my lawn to choose the right post-emergent herbicide?
Accurate weed identification is crucial for selecting the correct post-emergent herbicide. Different herbicides are formulated to target specific types of weeds. Broadleaf weeds, such as dandelions and clover, require different herbicides than grassy weeds, such as crabgrass and foxtail. Use a weed identification guide or consult with a local lawn care professional to identify the weeds in your lawn. Once you know what you are dealing with, you can choose a post-emergent herbicide that is specifically designed to control those weeds.
Are there any natural or organic alternatives to chemical post-emergent weed killers?
Yes, there are natural and organic alternatives to chemical post-emergent weed killers, but their effectiveness can vary. Some options include using horticultural vinegar (acetic acid), which can burn foliage on contact. However, it may require multiple applications and can also harm desirable plants if not applied carefully. Another option is hand-pulling weeds, which is effective for small infestations. Corn gluten meal can act as a pre-emergent, but it has some post-emergent properties. These alternatives may be more environmentally friendly but often require more effort and may not be as effective as chemical herbicides.
How long does it take for a post-emergent weed killer to start working and kill weeds?
The time it takes for a post-emergent weed killer to start working and kill weeds depends on several factors, including the type of herbicide, the type of weed, the weather conditions, and the application rate. Some herbicides may show visible results within a few days, while others may take a week or two. Warm, sunny weather generally speeds up the process, while cool or rainy weather can slow it down. Always follow the product label instructions for application and expected results.
Can I apply a post-emergent weed killer to my lawn if it has recently been seeded or sodded?
Applying a post-emergent weed killer to a newly seeded or sodded lawn can be risky, as it can damage the young grass seedlings. It is generally recommended to wait until the grass has been mowed at least two to three times before applying any herbicides. This allows the grass to establish a strong root system and become more tolerant of the chemicals. Always check the product label for specific recommendations regarding application to new lawns.
What are the potential risks of using post-emergent weed killers, and how can I minimize them?
Potential risks of using post-emergent weed killers include damage to desirable plants, environmental contamination, and health hazards to humans and pets. To minimize these risks, always read and follow the product label instructions carefully. Wear appropriate protective gear, such as gloves and eye protection. Avoid applying herbicides on windy days to prevent drift. Keep children and pets away from the treated area until it is dry. Store herbicides in a secure location and dispose of empty containers properly.
How do I choose between a selective and non-selective post-emergent weed killer?
Selective post-emergent weed killers are designed to target specific types of weeds while leaving desirable plants unharmed. These herbicides are typically used on lawns to control broadleaf weeds or grassy weeds without killing the grass. Non-selective post-emergent weed killers, on the other hand, kill all vegetation they come into contact with. These herbicides are typically used in areas where you want to eliminate all plant growth, such as driveways or sidewalks. Choose a selective herbicide for lawn weed control and a non-selective herbicide for total vegetation control.
What is the best time of day to apply a post-emergent weed killer for optimal effectiveness?
The best time of day to apply a post-emergent weed killer is typically in the morning or late afternoon when temperatures are cooler and the wind is calm. Avoid applying herbicides during the heat of the day, as high temperatures can cause the product to evaporate before it has a chance to be absorbed by the weeds. Also, avoid applying herbicides on windy days, as the wind can cause the product to drift and damage desirable plants. Following the product label directions is always important.
How often should I apply a post-emergent weed killer to my lawn?
The frequency of post-emergent weed killer applications depends on the type of weeds you are trying to control, the severity of the infestation, and the product you are using. Some herbicides may require multiple applications to achieve complete control, while others may only need to be applied once. It is important to follow the product label instructions carefully and avoid over-applying herbicides, as this can damage your lawn. Monitor your lawn regularly and reapply herbicides as needed to maintain weed control.
Can I use a post-emergent weed killer in conjunction with other lawn care treatments, such as fertilizer or overseeding?
Yes, you can use a post-emergent weed killer in conjunction with other lawn care treatments, but it is important to do so carefully. Avoid applying herbicides at the same time as seeding or fertilizing, as this can interfere with germination or nutrient uptake. It is generally recommended to wait at least a few weeks after seeding or fertilizing before applying herbicides. Always check the product label for specific recommendations regarding compatibility with other lawn care treatments.
Conclusion: The Final Verdict
After careful consideration of all the options, we believe the Jonathan Green (12195) Lawn Weed Control – Post Emergent Broadleaf Weed Killer (5 stands out as the best overall choice for most users. It offers an excellent balance of features, performance, and value. Whether you are a casual user or a discerning enthusiast, this product delivers on its promises and provides a satisfying experience.
