Best Weed Killers: All the Stats, Facts, and Data You’ll Ever Need to Know

The presence of weeds can ruin the appearance of any landscape, so it becomes essential to remove them. You need a weed killer that is powerful enough to kill most types of weeds, yet safe to use around all types of properties.

Top Pick

Spectracide Weed & Grass Killer Concentrate, 64 fl oz

by Spectracide

Rain-repellant concentrated weed killer

Get rid of any weeds or grasses growing around your house in a matter of hours with this concentrated weed killer. It attacks the roots directly to provide you with lasting results without contaminating the soil, so you can replant in the same place within days.


  • Water-resistant formula, exposure to water after 15 minutes of application does not remove effectiveness
  • Concentrated mix, can be used with any spraying tool to cover either large fields or small patches
  • Visible results in three hours


  • Not suitable for spot treating any weeds growing in your lawn


For more information about Weeds – Visit our Weeds Category

Roundup 5003240 Weed and Grass Killer III Ready-to-Use Trigger Spray, 1-Gallon

by Roundup

Ready-to-use rainproof quick weed killer

You don’t need to mix this weed killer before using it as it comes in a ready-to-use spray bottle that is both convenient and highly effective. Any weeds or grasses exposed to this strong formula will get eradicated within hours.


  • Results become apparent in around three hours
  • Becomes rainproof in around ten minutes
  • Safe to use in vegetable gardens, tree rings, driveways, flower beds, etc.


  • Requires effort when covering large areas

Honorable Mention

Green Gobbler Vinegar Weed & Grass Killer | Natural and Organic Weed & Grass Killer |1 Gallon

by Green Gobbler

Certified organic and non-toxic weed killer

Get rid of weeds in under 24 hours with this ultra-powerful weed killer that uses 20% acetic acid to complete the deed. Although it’s strong, it’s still perfectly safe to use around all types of properties right out of the bottle.


  • Organic use certified as it does not use toxic chemicals for weed removal
  • Four times more powerful than table vinegar for quick weed removal
  • Kills most types of weeds


  • Best results are achieved when used on a sunny day with temperatures above 65-degree Fahrenheit

The Contender

Ortho Weed B Gon Weed Killer for Lawns Ready-To-Use2 with Comfort Wand, 1 gal.

by Ortho

Strong rain-repellant weed killer for spot treatment

As long as you use this weed killer as per its directions, you can rest assured that your lawn will not get damaged while it will take care of any broadleaf weeds, dandelions, and clovers. You can expect to see visible results in a matter of hours.


  • Provides a list of more than 250 weeds that can be killed
  • Can be used right out of the bottle for spot treatment or broadcast application
  • Repels rainwater after one hour of application


  • Might damage grass if not used as instructed

Also Consider

Compare-N-Save 016869 Concentrate Grass and Weed Killer, 41-Percent Glyphosate, 1-Gallon , White

by Compare-N-Save

Powerful rainproof weed killer for small and large areas

You can cover an area as large as 25,000 sq. ft. with just a gallon of this 41% glyphosate weed killer. Results are usually visible within two to four days after application. Since this is a concentrate, you can make as much as 85 gallons of spraying liquid with it.


  • Becomes rainproof in around two hours
  • Requires just three tablespoons concentrate in a gallon of water
  • Kills weeds by targetting the roots


  • Not suitable for spot treatment in lawns

Consider reading related article – Best Weed and Feeds for 2020

What exactly is a weed killer?

Weed killers, also called herbicides, are agents that are lethal to some plants. The special mixture of chemicals creates the killing effect and the photosynthesis of the plant is suppressed. As a result, the plant dies. You have to consider whether chemical weed killers are the right choice for you. You can usually do this easily based on the advantages and disadvantages.


  • Work reliably and very quickly
  • Are mostly bee-friendly
  • Less tiring than weeding
  • Mostly have a long-term effect
  • Some products are biodegradable
  • Some products also fertilize the lawn


  • Can pollute the environment
  • Are partially harmful to aquatic organisms
  • Are sometimes dangerous for children and pets
  • Can cause severe irritation to skin and eyes


What types of weed killers are there?


Weed killers work very differently. A distinction is made between total herbicides, which mercilessly kill everything that stands in their way and between lawn weed killers. These usually only affect the broad-leaved plant species and therefore only destroy weeds, but not the lawn. If you buy a lawn weed killer, you can use it to kill dandelions, buttercups, thistles and a wide variety of clover species. The lawn, on the other hand, is spared and is not damaged if used properly.

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Total herbicides

Total herbicides are chemical lobes that kill everything. They are not suitable for treating weeds from the lawn, as your beautiful and well-kept lawn could also be damaged. The chemical formula of a total herbicide ensures that all plants that come into contact with the herbicide really die.

Lawn weed killer

The lawn weed killers are selective herbicides that only effectively combat certain plants. They mostly work through the leaves and roots. For you, this means that you have to wait 4 to 6 days after a lawn cut to use the lawn weed killer. The reason for this is that the weeds have enough leaf mass to absorb the poisonous active ingredients.

Nevertheless, with lawn weed killers, you must ensure that they are also suitable for the weeds that can be found in your lawn. Because not all weed remedies work against every weed. Weeds that are effectively killed can usually be found on the front of the packaging.


Why you should use a weed killer

Unfortunately, a weed killer is essential for a well-kept and beautiful lawn. Even if only a few weeds are visible in the lawn, disaster can occur within a very short time. Especially when it rains for a few days in warmer temperatures, the weeds appear in abundance and make your lawn unsightly.

In addition, the weeds steal the nutrients from the lawn or the plant. What is worse, however, is that the weeds cover your lawn and take away the vital sunlight. In a very short time, the weeds have spread so that you can hardly see the lawn. The same naturally applies to moss. This can be combated very well with a lawn mower.

Weeds can quickly become a nuisance

Of course, a little dandelion does not matter, but due to the particularly rapid spread, this weed becomes annoying and a great annoyance. In order to avoid the problem, weed killers are an important and helpful tool that you can use to save time and time on the pests. So that you can easily and effectively remove the weeds without having to stoop for hours weeding, there are several options to choose from. Whether with or without chemistry is up to you. It should always be important here whether you have children or pets in the household.


What do weed killers cost?

Weed killers can be found in many price ranges. It doesn’t mean that the most expensive herbicide is the best. As you can see from the comparison, you can also buy very good weed killers in the lower price segment. Of course, it always depends on which system you choose. Should the weed killer be for the patios or the sidewalk or do you need a lawn weed killer?

Liquid herbicides are in the lower price segment

In particular, you can get the herbicides in the bottle for under 10 dollars per 100 millilitres. Of course, this varies by brand and system. However, if larger quantities are required, it is worth buying canisters, since you can usually get them cheaper. In addition, the herbicide lasts a very long time and can therefore be stored well.

Other methods to kill weeds

It doesn’t always have to be a herbicide, which is also often toxic. In addition to weeding, we also have the option of using a thermal shredder. This works with heat and eliminates weeds. You can get such a thermal shredder from around 25 euros in stores.

However, the thermal shredder has the disadvantage that it cannot be used on lawns. It is only suitable for sidewalks, patios or parking spaces, otherwise you would burn the lawn. In addition, only the upper part of the plant is burned off with this variant, the root is spared.

A slightly more expensive variant is the weed fleece, which actually does a very good job. The shelf life is very long. If you need more of these, you will usually also receive a volume discount.

You can also use vinegar and salt to remove weeds on sidewalks, driveways and patios. With vinegar you increase the acidity of the soil so that weeds no longer feel comfortable. The same principle works when salt is used. This is inexpensive and is considered an approved food , so it is not rated as a weed killer under the Plant Protection Act.

Nevertheless, pay attention to the moderate use of these aids. Not only for the sake of the environment, but also because vinegar and salt attack the stones in a more frequent and concentrated form and can cause discoloration. It is best if you only use these measures in an emergency and otherwise use one of the other methods.

When could a weed killer be used?


It depends on the respective products. Always look at the description of each weed killer. The herbicides vary and you can apply them in the morning or in the afternoon. The manufacturer’s description must always be followed carefully.

As a rule, the lawn weed killers are used from April to June. It makes sense to fertilize the lawn a few weeks beforehand so that it is strengthened and the treatment survives well. However, if you use a weed killer that is enriched with fertilizer, you must of course not fertilize the lawn beforehand.

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Pay attention to the special features of the application


In order to really destroy the weeds, the lawn must not be mown for at least 5 days beforehand. This is because the liquid or powder is often absorbed through the leaves. Therefore, it must be ensured that there is enough leaf mass in the weeds so that you can fight them effectively.

It is also important that you only apply the weed killer if no rain is reported so that it does not seep into the ground and attack other plants. Even in windy conditions, you should not destroy the weeds, as the powder or liquid could be blown onto other plants and harm them. Mild temperatures are also very important.

How often do weed killers need to be used?

That also depends on the respective product. There is no general statement here. If your lawn is well fertilized and growing well, it may well be that a single application is sufficient. If the lawn grows poorly, the herbicide usually has to be applied several times. It also depends on the weather conditions and the quality of the product. Many things play a role here, which is why it is not possible to give a general answer to how often you have to apply the weed killer. It is therefore imperative that you follow the manufacturer’s instructions.

How to use granules or liquid weed killer

Depending on whether you are using granulate or liquid weed killer, you have to do it differently. The liquid herbicide in particular is available in two different variants. On the one hand the normal weed killer and on the other hand the weed killer with lawn fertilizer. The instructions explain exactly how to proceed to use the weed killer or weed killer with lawn fertilizer properly. The yield varies depending on the brand of the product and can make applications cheaper or more expensive.

Less is more!

If you use a pure weed killer, you have to apply it sparingly to the weeds. However, the liquid should be applied to the entire plant and not just the stem. The poison is thus absorbed through the leaves and effectively destroys the plant.

With a weed killer with lawn fertilizer, it is no problem if you apply something more. However, this can quickly add up and cost more to use. But if there is no weed, it makes more sense to buy a pure lawn fertilizer.

The lawn mower guarantees uniformity

Weed agents, which consist of granules, also have a mono or double function. In both variants, fill the granulate into a gritter and spread it evenly on the lawn.

Special care is always required when applying the agents. Almost all of the chemical weed killers can cause severe irritation to the skin, eyes and mucous membranes. For this reason, you should always wear gloves and safety glasses when using. Even in light winds, weeds should not be used!

How long is it not allowed to walk on the lawn after the treatment?

The lawn should not be walked on until the liquid fertilizer has dried. But even then you should not step on the lawn immediately, as some manufacturers recommend. Depending on the weed killer, the lawn can be used again within a few hours or should not be walked on until the next mowing. Especially those who have children in the household should rather wait longer and only let them back on the lawn when it has been mowed. Unfortunately, all herbicides are toxic and can cause dangerous irritation.

Toddlers in particular put everything in their mouths and if they have slid across the lawn, it is enough to put their fingers in their mouths. Irritation of the mucous membranes or even severe poisoning and burns can quickly occur here.
If you use the lawn to feed it to pets, you have to be particularly careful. According to the manufacturer, the grass should no longer be fed this year after weed killers have been applied. This means that if you use weed killers every year, you can no longer feed the grass to your pets so that they do not suffer any damage or are even poisoned.

Where can the liquid lawn be used to weed killers?


This can only be said by your community, since the regulations are different here. As a rule, however, you may only use a weed killer that is used in agricultural, forestry or horticultural areas.

This means that you must not treat sidewalks, patios or your driveway with chemical weed killers. The reason for this is that the next time it rains, the chemical agent can seep into the stone and thus get into the groundwater. However, since most weed killers are harmful to aquatic organisms, this should be avoided.

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It is also prohibited to use weed products near rivers and bodies of water. Here you should also inquire with your community and find out which products can be used.

Before you buy a weed killer, you should first check with your community which products you can use. This is the only way to rule out that you are not endangering people, animals and the environment. The penalties can also be very high if you use a prohibited product.

The guidelines for the use of herbicides

Of course, you are not allowed to use herbicides as you like them. The Royal Garden Academy Berlin has summarized the following guidelines:

  1. Use as few herbicides as possible
  2. Use herbicides only when necessary
  3. Choose weed killers that are harmless
  4. Follow the manufacturer’s instructions exactly
  5. Careful handling so that no neighboring plants are sprayed on
  6. Document which herbicide is used when
  7. Pay attention to storage and disposal

So you choose the right lawn weed killer

There are a total of three variants of lawn weed killers. These are:

  • Chemical weed killer
  • Chemical weed killer with lawn fertilizer
  • Mechanical weed killer
  • Biological weed killer

All of them have their advantages and disadvantages, which we briefly summarize here. Chemical weed killers are the best known form of weed killer. They are available in liquid form or as a powder and are mixed with water and applied to the lawn.

The chemical composition in particular is to be regarded as a disadvantage here, since there is a potential danger to humans, animals and the environment if these products are not used properly. In addition, the weather forecast must be observed because it must be dry if you want to use the weed killer. The temperature must also not be too low so that the effect is not impaired.

One advantage is that you can use it to treat large areas effectively. Furthermore, the chemical weed killers are in the lower price segment and are therefore very popular with large areas.


  • Very effective
  • It can be used to treat large areas
  • The chemical weed killers are in the affordable price segment


  • Not suitable for every weed
  • Planning when applying is required
  • The product must be used properly


Chemical weed killers with fertilizer function are products that work like mono weed killers, except that they also incorporate a fertilizer. Of course, you save a lot of time with the integrated fertilizer. Nevertheless, you should look closely whether such products are really necessary, as they are in the upper price segment. If you have a lawn that grows very well, fertilizer is not really necessary.

Advantages :

  • Time saving through weed control and simultaneous fertilization
  • All broad-leaved weeds are usually killed with it


  • Doesn’t always make sense
  • Are in the upper price segment

Mechanical weed killers are available in different versions. It refers to:

  • Weeding – the simplest but most strenuous method of killing weeds, which is also very time-consuming.
  • Thermal weed killer – simple way to burn weeds on sidewalks and patios.
  • Weed fleece – long-term weed prevention, since no light comes through the fleece and the weeds cannot grow at all.

Here too there are advantages and disadvantages of the different methods. The main disadvantage of weeding is that it is very time consuming and the back suffers.

Thermal weed killer vs. Weed fleece

The thermal weed killer cannot be used on lawns because it not only burns the weeds, but also the adjacent lawn. With the Thermo method you can quickly destroy the weeds, but unfortunately the root is not packed. So you have to use this method more often.

The weed fleece, however, has almost only advantages. The weeds are prevented from growing by the lack of light. The disadvantage is that the weed fleece is in the high-priced segment and is not suitable for lawns.

You should compare these purchase criteria

If you want to buy a herbicide, you should not only look at the products themselves, but also think about what you want. Is it okay for you to use chemical agents or is it better to be a biological weed killer? But you also have to look closely at these criteria when buying to buy the right weed killer.

  1. How big is the lawn?
  2. What type of weed is it?
  3. Is the garden on a river or water body?
  4. Do you have children or pets?
  5. How much time do you have?

If you answer these questions, you will quickly see which weed killer is suitable for your purposes and needs. It makes sense to make a list of the advantages and disadvantages. Basically, however, the following applies: As soon as pets or children live in the household, it is better to rely on a biological lawn weed killer.

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