9 Best Post Emergent Herbicide in 2021 – Reviews

Weeds are a natural part of every landscape. They can be suppressed and controlled timely through the controlling techniques but can never get rid of them permanently. 

That’s why the routine visit of yards and lawns is recommended so as to control weeds before their full growth. Otherwise, once they get established, the only way to control them is the best post-emergent herbicides.

Most people have a busy routine so they could not give a routine visit to yards and as a result, the weeds sprout everywhere in the yard. Now left only two ways to eradicate them i.e. pulling them out manually or the post-emergent herbicides. 

Pulling these nasty and pesky plants will take many hours and leave you tired even with uncompleted work. So, the best option is to use a post-emergent herbicide. 

Post emergent herbicides do work on the specific type of plants having specific characters. Some of them kill the above-ground portion of plants but some are much active and kill the plants to roots. 

Once you notice the weeds invading your landscape and you have the best practice to identify them, then it will be much easier for you to choose the best herbicides for weeds. But, from the huge market of herbicides, it will never be easy to select the top and best post-emergent herbicide.

I too faced all of these problems in my earlier stages of landscaping but failing again and again builds my experience and now I could easily manage my home yards without any guidance. 

To share my experience and knowledge with you fellows, I build this guide that is specific to the post emergent herbicides products, reviews, consumer response, and the methods of controlling the weeds through post emergent. 

Let’s start from the very basic knowledge of understanding what post emergent herbicides are and how they work. Understanding both these points will let you ease in choosing the desired herbicide.

What are Post Emergent Herbicides? 

Post-emergent herbicides completely show by its name that they are the herbicides that are applied to the already existing weeds. These herbicides are used to kill the ugly little heads sprouting on the lawn. 

Majorly the two types of herbicides are used for controlling weeds i.e. pre and post-emergent herbicides. Pre-emergents are applied prior to the germination of weeds after examining any signs of weeds. But once you could not get them controlled prior to germination, the only solution left is to apply post-emergent herbicides. 

Using post emergent herbicides are many active chemicals that kill existing weeds as well as helps the weeds control in the future. But a wide range of post-emergent herbicides types provides versatility in function to ease you in killing the specific weeds. 

Most of the post-emergent herbicides have a strong impact on attacking the foliage as well as moving systemically in the plant’s body to the roots. These post-emergent herbicides come in granular as well as spray forms.

That’s why it is advised to read the instructions and the features of the herbicides before buying one. All the herbicides have control for specific weeds and applying the herbicides on the grass type that is not mentioned as safe on bottles may get harm badly by chemicals.

Before moving to the best post-emergent herbicides product reviews, have a small reading of the buying guide. It will help you with the best type of post-emergent herbicide.

Buying Guide: Which Post-Emergent Herbicide is Best for My Lawn?

Before choosing a post-emergent herbicide, there are some important tips and guidance tips to keep in mind. Firstly, you should be clear about what type of grass you have and what weeds you are going to control. 

All of the herbicides have clear instructions regarding the function and weeds type control. If the grass type of your lawn is mentioned safer by the manufacturer, then buy it. Otherwise, applying the wrong herbicide will damage the turf and beauty of the yard.

Post-emergent herbicides are selected on the basis of their functions and their active agents in the formulation. These are the two major types of post-emergent herbicides. 

Selective Vs. Nonselective Herbicides

Post emergent herbicides are classified in these two types:

Selective herbicide

Selective herbicides are specifically formulated for controlling the specific type of weeds and do not harm the other weed types. It is clearly mentioned on the product about the weeds type control and its way of action. 

The selectivity of the herbicide is as the some are designed to kill the just broadleaf weeds and some are to kill grassy weeds. Each of these herbicides will not harm the other type.

Similarly in the case of season-specific herbicides does not harm warm-season grasses but affects the cool-season grasses or vice versa.

Nonselective herbicide

These herbicides have highly strong active ingredients that kill all the green matter or foliage it touches. Such herbicides are the best solution to control the weeds in places where you don’t want any vegetation like driveways, sidewalk, or fence. 

In case of use in gardens or yards, the best method is spot application to save the desired plants.

After selecting the selective or nonselective herbicide, the second thing to notice in herbicide is a mode of action i.e. if they are systemic action or contact mode of action.

Systemic vs. Contact herbicides

Systemic post emergent herbicides

Systemic herbicides kill the plants or foliage to roots and destroy the weeds from inside leaves to roots. Such herbicides have a great advantage in the form that these weeds will not grow again.

Most of the herbicides have a systemic mode of action. The only drawback of these herbicides is that it can take several days to work.

Contact post emergent herbicides

Contact or nonsystemic herbicides does act on the above-ground portion of plants or weeds. These herbicides burn out the green foliage completely on which it falls but do not disturb the roots.

Contact herbicides kill the leaves and starve the plant due to a lack of photosynthesis. Besides fast work than systemic herbicides, these herbicides leave the chance of reappearance of weeds from roots.

Reviews: Best post emergent herbicides

1. RM43 43-Percent Glyphosate Plus Weed Preventer Total Vegetation Control

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RM43 is a top-quality post-emergent herbicide having a combination of two chemicals i.e. glyphosate and Imazapyr. Both of these ingredients makes the herbicide a great weed controller.

The premium feature of this herbicide is that it has no limitation for the entry of children and pets until the drying of chemicals. It is safe for children and pets. 

The other great thing about this post-emergent herbicide is that it has a mix of surfactant that helps the chemical to stick to the leaves surface.

A combination of two chemicals makes it a strong active herbicide that kills the weeds and prevents the next coming year. 

It is a great choice for controlling the weeds along driveways, sidewalks, fence rows, gravel paths. The spray application of this herbicide can be done on bare ground as well as the spot killing of bushes, weeds, and vines.


  • Non selective herbicide
  • Systemic
  • 43 percent glyphosate
  • Surfactant mixed in chemical
  • Covers more than 17000 square feet

2. Compare-N-Save 016869 Concentrate Grass and Weed Killer

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Compare-N-Save is a concentrated formula for killing the post-emergent weeds. This product is among the top-selling herbicides in the USA which clears that it has great results.

Compare-N-Save is a well-known producer of herbicides and other chemicals for lawn and garden improvements. They have good fame among the gardeners and professional growers by their quality.

This 41% active agent (glyphosate) herbicide is a much-concentrated formula that means you can make a lot of sprays.

The great thing about this herbicide is that it is rainproof for 2 hours that makes it a great choice for rainy areas. 

It has a highly active agent that kills all the types of plants, weeds, or desired plants it touches. So, you need to be careful about its application in yards. Spot application is recommended in yards for killing the weeds at the spot.


  • Nonselective herbicide
  • Systemic formula
  • Covers more than 25000 square feet
  • Ready to use spray
  • 41% glyphosate
  • Kills all the green foliage to roots

3. Blindside Herbicide WDG 8 oz. Post-Emergent Broadleaf Weed Killer

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Blindside Herbicide is a selective post-emergent herbicide and a great choice for killing the broadleaf weeds. It is a heavy-duty formula by Blindside that kills the broadleaf weeds in less time due to its high concentration.

The premium feature of this herbicide is the high concentration of active agents that not only kills the present weeds but also suppress them in the future.

It is featured with 60% Sulfentrazone and 6% Metsulfuron that collectively makes the highly concentrated formula to control the broadleaves in yards and lawns. 

This concentrated formula works great in both warm and cool temperatures. It targets the leaves as well the roots of weeds and kills them permanently without leaving any chance of their regrowth.

The amount of this formula for cool season grass is 0.075-015 oz. per 1000 square feet while 0.15-0.23 oz. per 1000 sq.ft. 


  • Selective herbicide
  • Systemic formula
  • Kills broadleaves i.e. chickweed, crabgrass, clover, black medic. Nutsedge, dandelion, wild onion and garlic.
  • Kills black medic, barnyard grass and henbit
  • Kills both leaves and roots
  • Works in both warm and cool temperatures
  • Covers almost 50000 sq.ft.

4. Fiesta Selective Post-Emergent Turf Weed Killer

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Fiesta post-emergent weed killer is a selective weed killer that controls the broadleaf weeds in yards and gardens. You might be new to this manufacturer but this producer has great fame among the professional due to its safety to pets and great results in killing weeds.

The premium feature of this herbicide is the selective nature of this formula to kill weeds and moss while additionally suppressing diseases. 

It is featured with patented technology having visible results within 24 hours of application. 

It works the same in hot and cold temperatures.

The great thing about this herbicide is rain-fast within 3 hours. Furthermore, it does not have any odor of liquid herbicide and hazards to pets and children.

It is better to apply in playgrounds, parks, cemeteries, sports fields and golf courses.


  • Selective herbicide for broadleaf weeds
  • Kills weeds and moss
  • Prevents the lawn diseases attack
  • Visible results in 24 hours
  • Cover up to 10000 sq.ft.
  • A great alternative to synthetic chemicals

5. Roundup Weed & Grass Killer Concentrate Plus

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Roundup weed and grass killer is a nonselective, contact, and systemic herbicide for killing the weeds in yards and paths. Roundup weed killer is a top-rated product among weed controlling professionals.

This premium quality herbicide has the ability to kill all types of tough weeds and grasses to the roots. It kills the weeds permanently and prevents their regrowth.

The shiny feature of this herbicide is impressive active agents concentration i.e. Glyphosate and diquat dibromide. Both are highly active agents for killing the green foliage. Diquat ensures the prevention of regrowth of weeds in that area again.

It is a liquid formula and ready to apply by just mixing in a tank sprayer.

The great thing is the rainproof nature of this herbicide i.e. 30 minutes. This feature adds the product to the most loving herbicide in the cold regions.

It is mostly used to kill the weeds in walkways, driveways, gravel areas, and mulch beds. But make sure to cover the desired plants with plastic sheets to avoid contact with the chemicals.


  • Nonselective formula
  • Contact and systemic herbicide
  • Kills all tough grasses and weeds
  • Kills leaves to roots
  • Best for patios, walkways, and driveways
  • Visible results in 12 hours
  • Rainproof for 30 minutes

6. Doctor Kirchner Natural Weed & Grass Killer (2.5 Gallon) No Hormone Disrupting Chemicals

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Doctor Kirchner is a natural weed killer to control the weeds in yards as well as the lawn and garden. It is called the best natural weed killer herbicide due to its natural ingredients used in making.

The premium benefit of this herbicide is that it has not any chemical effects so makes it safe for kids and pets. It blocks the plant’s body functions and makes them dead in no time.

This natural weed killer is composed of ocean saltwater, commercial strength food-grade vinegar, and soap. All of these ingredients have a natural role in blocking and disturbing the plant’s mechanisms.

The great thing about this natural weed killer is that it is safe to use around kids. It is a natural and environmentally friendly product. 

It is not commonly proposed to use in lawns as it is not a selective weed killer so it could harm the lawn. It is advised to use on the bare lands, paths, and gravel blocks.

The premium feature of this natural herbicide is that it has no mixing of any chemical, glyphosate or any other toxic agent.


  • Natural weed killer
  • Contains no chemical, toxic agent or glyphosate
  • Safe to use around childs and pets
  • Leaves the environment unharmed
  • No mixing

7. Southern Ag Amine 2,4-D WEED KILLER

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Southern Ag Amine 2,4-D is a selective type post-emergent herbicide that has great performance of killing the broadleaf weeds. From dandelions to clover, poison ivy to chickweed, all become dead by this herbicide application.

Being a selective herbicide, it is a perfect choice for spraying over the grasses as it never harms the grass and does attacks only broadleaved weeds. 

Southern’s herbicide is featured with 46% of active agents i.e. 2,4-D. It is a strong active agent for killing plants by blocking the plant body mechanisms. 

The only care of such a strong and highly concentrated formula is keeping the children out of the lawn after the application. As it is a strong chemical it could be hazardous for children.

The application of this herbicide is much simpler and easier. All you need is mixing 2-3 tablespoons of concentrate in 3-5 gallons of water. Apply the solution through any sprayer.

This product comes in 32 oz. packing that is enough for covering 20000 sq.ft. lawn area.


  • Selective herbicide
  • Kills broadleaf weeds
  • Highly active
  • Safe for grasses mentioned on label
  • 46% active agents
  • Cover more than 20000 sq.ft.

8. PBI/Gordon 652400 Speed Zone Lawn Weed Killer

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Gordon’s speed zone lawn weed killer is a fast-acting selective weed killer. This post-emergent herbicide is a great choice for persons looking for a selective herbicide and wants to get rid of weeds in the grass-covered lawn.

The premium feature of this product is the versatility of weeds controlling. It controls more than 100 types of broadleaf weeds i.e. wild garlic, violet, clover, and charlie.

It has 2,4-D as an active agent that kills the plants by blocking the plant’s body mechanisms. The concentration of 2,4-D is 28.57% in this product that is an impressive figure for a contact herbicide.

Being a contact herbicide, it shows the results within hours and complete killing in 1-2 weeds according to the weeds type.

The premium and shiny feature of this herbicide are its superior results in cool weather. As the herbicides work slowly in cool weather due to the slow uptake of herbicides. But this speed zone herbicide overcame this issue and formulated this product that works fast in cool weather.


  • Selective herbicide
  • Contact herbicide formula
  • Kills broadleaf weeds
  • Kills more than 100 broadleaf weeds
  • Cover more than 14300 sq. ft.
  • Works fast in cool weather

9. BioAdvanced 704140 All-in-One Lawn Weed and Crabgrass Killer Garden Herbicide

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Bio-Advanced All-in-one weed and grass killer is a selective herbicide for killing the broadleaf weeds in lawns and grounds.

It is well known by the name of the All-in-One formula as it kills the lawn weeds as well as the crabgrass without harming the lawn grass.

The premium feature of this post emergent herbicide is that it can be used to kill more than 200 broadleaf weeds like dandelion and clover.

It consists of multiple active agents like 2,4-D, Quinclorac, and Dicamba. All of these active agents collectively act on the weeds and kill them to the roots.

The mode of action of this herbicide is very unique as it just acts on broadleaf weeds and kills their root system and does not cause 1% harm to the lawn grass.

This herbicide has impressive rainproof time as 1 hour that is enough to kill any tough weeds to root.


  • Selective herbicide
  • Kills broadleaf weeds
  • Kills more than 200 weeds
  • Controls dandelions and crabgrass
  • Does not harm lawn
  • Rainproof for 1 hour

When to Apply Post-Emergent Herbicides

The best time for applying the post-emergent herbicides is the late spring season because the weeds are small and active growth stages in this season. The application of herbicides during this stage will get easier control of weeds and kill them entirely to roots.

Besides late spring applications, they give desired results during summer application but need more care and frequent applications. Post-emergent herbicide can also be used on weeds preparing for winter.

Using a Post-Emergent Herbicide

Before using or application of post emergent herbicide, consider following these steps and tips to get the desired results.

  1. The best and optimum temperature for the application of post emergent herbicide is below 85 degrees F. If you apply herbicides at high temperatures, it will burn the lawn.
  2. Not only the environmental temperature affects the herbicides, but also soil temperature impacts the results of herbicides. The optimal value for post-emergent herbicide application is soil temperature above 55 degrees. Because the herbicides do not work if the ground is frozen.
  3. It is great to not mow the lawn before and after the post-emergent application. It will give more time to chemical absorbance.
  4. The optimal time for application is morning so plants can metabolize better.
  5. If the lawn is under stress, you will not get the desired results. So, it is better to wait until the lawn condition gets better.
  6. Some herbicides need watering just after the herbicide application. And some prevent the water or rain and work in dry conditions after application. So check the weather forecast and do an application accordingly.

How to Apply Post-Emergent Herbicides

After choosing a type of post emergent herbicide, now it’s time to apply to plants. These are the following two methods of application.

1. Spot application

Spot treatment focuses the weeds or any plants to which it is applied. Bob selective herbicides are commonly recommended with spot application.

Mix the herbicide with water in the tank of backpack sprayer or hand pump and apply as per instructions. Make sure to apply it over the specific plans as it will kill any plants it touches.

2. Blanket application

If the most area of the yard is covered under weeds then the blanket treatment will be the better solution. Apply the post emergent herbicides by mixing with water or granules through a spreader.

Make sure to apply evenly across the lawn and sweep the granules along the sidewalk and driveway into the lawn.

With both of these treatments, weeds can be controlled but have different modes of application. Make sure to keep the pets and children away from the lawn after application. Be sure to wear PPE including closed-toe shoes, gloves, long sleeves, and pants.

Additional tips

  • Some post-emergent herbicides need surfactant that will increase the rate of absorption and stickiness to the leaves. Some herbicides are ready to apply surfactant. Make sure to read the label and apply it accordingly.
  • You may add the spray indicator dye to the herbicide that helps to see the parts of the plant where the spray is done. It helps for even application and remains available for some days.

Final Words

Choosing the best post-emergent herbicide is never so easy as the huge sea of herbicide is present in the market. All of these are mixed up, having slow to fast action. Selecting the best and right one for your lawn weeds can be challenging for you without any guidance.

To overcome these issues, I build this guide on best post-emergent herbicides having a wide range of product reviews. All types of selective to nonselective, systemic to contact herbicides are reviewed in this article. According to my personal experience, RM43 43-Percent Glyphosate Plus Weed Preventer performs great for controlling all types of weeds.

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