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10 Best Weed Killers in 2020

It is always frustrating to see weeds growing around your beautifully-nurtured plants. That’s why we have compiled a list that details some of the best weed killer products you can find. Whether you’re looking for a selective or non-selective weed killer, we’ll have something for you.

These are some of the best weed killers to kill those killer weeds. Try saying that five times quickly.

View The Best Weed Killer Below

1. Spectracide Weed & Grass Killer Concentrate

Spectracide Weed & Grass Killer Concentrate

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We have selected this as the best weed killer we can find. Better if used in warmer, sunnier weather, this Spectracide product acts quickly to destroy all those undesirable weeds. When applying – which you should do using a tank sprayer – you should cover all the plants and trees you want to protect to prevent damaging them.

You will see visible results in as little as three hours, with weeds completely drying up on the surface in as little as twenty-four hours. In only fifteen minutes, the substance will have dried enough to be rainproof. You should not mow or cut the plants you have treated for at least a week, and instead, let them wither entirely.

Obviously, due to the toxic nature of this weed killer (and usually all others), you should not use it on or around food, whether for humans or animals. In extreme cases, when you want to take up your entire lawn, you can also spread this weed killer all over the grass, making the job of pulling it all up much more manageable.

Pros:
+ Made for killing weeds and grass
+ Best for use on driveways, walkways, fences, trees, flower beds, shrubs, yard areas, and lawn replacements

Why We Liked It – The quick-drying times, as advertised, and the length of time to kill weeds, is what makes this product stand out from the rest, along with how effectively it rids your garden of weeds. It truly is the best weedkiller.


2. Roundup Weed and Grass Killer

Roundup Weed and Grass Killer

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Roundup Weed and Grass Killer is a concentrated killer and is best used on widespread problems or even infestations of weeds. Like most weed killers, you should use this product in a tank sprayer and dilute it with water, according to the manufacturer’s instructions.

Roundup is well-known for completely killing weeds; the weed’s leaves absorb the chemicals, which then penetrate down into the roots. Roundup makes sure that the plant is killed at the source and will not grow back. The weeds will begin to wilt between two to four days after application, and the weeds should be utterly dead in around one to two weeks. Roundup’s weed killer is also rainproof only thirty minutes after you use it.

Pros:
+ Made for killing weeds and grass
+ Best for use on flowers, shrubs, trees, patios, walkways, driveways, gravel areas, mulch beds, fences, edging, foundations and lawn replacements

Why We Liked It – We found Roundup’s concentrated weed killer useful for your big projects, doing an effective job in a fantastic time scale. RoundUp is one of the best, premium weed killers.


3. BioAdvanced DuraZone Weed & Grass Killer

BioAdvanced DuraZone Weed & Grass Killer

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This weed and grass killer from BioAdvanced is a great little affordable bottle. While it kills all existing weeds, the formula is also a weed control and preventer. It helps prevent any more weeds from growing in the future and promises to last up to six months.

You apply this product to the area you want to stop from sprouting weeds, rather than just the weeds themselves. (Although, still keep it away from your desirable plants!) The 24oz bottle option is ideal for ease of use and simplicity, while still doing an effective job. However, BioAdvanced warns that this product is not suitable for removing lawn weed, as it will also kill the grass.

Pros:
+ Made for killing: weeds and grass
+ Best for use on driveways, sidewalks, patios, fences, foundations, walkways, mulched areas and around ornamental things

Why We Liked It – If you don’t have too much of a weed problem or only a small bed, this little product will do the job for you perfectly, killing existing weeds as well as keeping new ones at bay.

4. Spectracide Extended Control Concentrate Weed & Grass Killer

Spectracide Extended Control Concentrate Weed & Grass Killer

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This second product from Spectracide on our list is also fantastic. With a fast-acting formula that reaches down to the root of the weed in a short time, you will see visible withering in as little as three hours and an almost complete surface withering in as little as a day.

As well as being rainproof in only fifteen minutes, this weed killer doesn’t just kill existing weeds, but will also prevent the growth of further weeds for up to five months. It should be diluted in a ratio of 7 fluid ounces to 1 gallon of water.

Pros:
+ Made for killing: weeds and grass
+ Best for use on patios, walkways, driveways, around flower beds, trees, and shrubs along fences and foundations, and large areas such as lawn replacement.

Why We Liked It – This weed killer is all about appearance and speed, potentially clearing your weeds in a very short timescale, while also preventing their further growth.


5. RM43 Total Vegetation Control

RM43 Total Vegetation Control

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This product is used in a slightly different way to your standard idea of a weed killer. You can only use it in areas where you do not want to be growing anything for at least a year. RM43 Total Vegetation Control is a combination of two herbicides and a surfactant and promises to wither anything it touches.

After two hours, the spray will have dried to be rainproof and, once this point has been reached, it is safe for children and pets to be around. You should use it on large areas, roadsides, and for spot control of brush vines. Contained in the bottle featured is enough product to treat 17,297 square feet – which, in scientific terms, is a lot.

Pros:
+ Made for killing: all vegetation
+ Best for use on spot treatment of brush vines, roadsides, large areas where no vegetation will be growing for at least a year

Why We Liked It – If you have a big patch of lawn to clear permanently (or at least for a long time), then RM43’s product will do this job for you better than anything else. However, bear in mind that nothing will be growing here for at least a year after use.


6. Roundup Weed & Grass Killer Concentrate Plus

Roundup Weed & Grass Killer Concentrate Plus

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Roundup makes it onto our list again with this concentrated weed killer. Available in a variety of sizes, this product offers visible results within twelve hours and promises to be dry in only thirty minutes. In 1-2 weeks, the plants will be dead. You apply it to the leaves until the unwanted plant is drenched, where it soaks in and travels down to the roots, killing weeds, grass, and lawn weed at the source.

Being a concentrate product, Roundup Weed and Grass Killer can cover a large amount of area – one-quarter of weed killer can cover up to 3000 square feet. Six fluid ounces should be added to one gallon of water for optimal results. Flowers, trees, and shrubs can be planted just one day after applying this weed killer, whereas you should wait three days for any lawn grasses or edible plants such as vegetables or herbs.

It is better to spray the weeds during warm, sunny weather with little wind, to prevent the weed killer from contaminating any desirable plants accidentally. Finally, we were also impressed with the satisfaction guarantee. If you’re not satisfied with this weed killer, get back in touch with Roundup with your proof of purchase, and they will refund you the amount.

Pros:
+ Made for killing: weeds and grass
+ Best for use on patios, walkways, driveways, gravel areas, mulch beds, fences, edgings, foundations, lawn replacements, and around flowers, shrubs, and trees

Why We Liked It – We liked this weed control and killer because of its vast area of effect, as well as the satisfaction guarantee.


7. Green Gobbler Vinegar Weed & Grass Killer

Green Gobbler Vinegar Weed & Grass Killer

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This one stands out from other weed killers with its organic, more environmentally friendly formula. The vinegar solution is directly made from corn, amongst other things; it’s both kind to the environment and supportive of farming economies. This product is free from glyphosates and contains no potentially cancer-causing ingredients. The vinegar is more than four times stronger than the stuff you put out on your table and made from corn distilled ethanol. It is marketed as killing all types of “broadleaf weeds upon contact.” You simply spray the weed with the included trigger spray and watch the weed wither up.

It also has a thirty-day money-back guarantee in case you are not satisfied with the weed killer.

Pros:
+ Made for killing: broadleaf weeds
+ Best for use on: along fences, foundations, pavers, and walkways

Why We Liked It – The main unique selling point of this one is obviously how environmentally friendly it is, killing weeds without pumping chemicals into the area. We are also impressed by its thirty-day money-back guarantee.


8. Compare-N-Save Concentrate Grass and Weed Killer

Compare-N-Save Concentrate Grass and Weed Killer

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This Compare-N-Save Concentrate weed killer contains 41% glyphosates. Glyphosate travels down to the root of the weed from the leaves, where you should spray it to kill the plant. This 1-gallon container can make up to 85 gallons of spray, which covers over 25,000 square feet. It’s also rainproof in only two hours, with clear withering in only two to four days.

It is best used for spot spraying – that is, selectively spraying weeds directly, making sure to avoid any healthy, desirable plants. Like most weed killers, for the best weed control, this product should be applied on a warm, sunny day with no rain forecast for at least a day. This Compare-N-Save Concentrate has been produced to mix easily with water.

As it’s concentrated, only 1.5 fluid ounces are needed per 1 gallon of water, which will cover 300 square feet (although a higher concentration may be needed for more mature weeds). Since glyphosate does not prevent any future growth, you can plant in the areas it has been applied just one day after using it. However, read the label for a complete list of different times.

Pros:
+ Made for killing: weeds and grass
+ Best for use on: around flower beds, trees, and shrubs; in and around fruit and vegetable gardens (follow the label’s instructions for safety when doing this); walkways, driveways, lawn restoration, brush and vine control and as a stump treatment

Why We Liked It – With only 1 gallon covering 25,000 square feet, it’s a good weed killer. Glyphosates are a known and trusted-to-be-effective herbicide that will do the job for you.


9. Southern Ag Weed Killer

Southern Ag Weed Killer

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This Southern Ag product utilizes a 2,4-D acid equivalent liquid to get rid of most “broadleaf weeds and woody plants.” This is also used in lots of other weed killers. It’s designed for use in turf, pastures, rangeland, ditch banks, and along fence lines. As always, check the label for specifics.

Southern Ag is a weed killer designed to be applied with a fan-type nozzle across specific areas. 2 or 3 tablespoons, mixed with 3 to 5 gallons of water, should cover 1,000 square feet, which is the equivalent of between 1 and 4 pints per acre of land. As usual, you should make sure to keep it away from desirable plants, and immediately wash it off if you accidentally do this.

Pros:
+ Made for killing: most broadleaf weeds
+ Best for use on: “certain grasses in lawns, parks, golf courses, and pastures; fences, ditch banks, non-crop sites, small grains, and corn.”

Why We Liked It – This Southern Ag weed killer specifically targets types of broadleaf weed and therefore is useful for spot spraying on individual lawns that often have those unwanted weeds poking through. We can also recommend Southern Ag 2.


10. Preen Extended Control Weed Preventer

Preen Extended Control Weed Preventer

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Finally, this weed preventer from Preen will help to block new weeds for growing for up to six months. As a non-selective weed killer, it can be used around many plants, although not on flower seeds, lawns, vegetable gardens, or other edible plants, and can be applied any time that you see weeds actively growing. As always, read the label to be both safe and efficient when using weed treatment chemicals. It’s also worth noting that you cannot purchase this product in NY.

As a weed preventer, this does not kill existing weeds. You will have to do that yourself with another weed killer or piece of garden equipment, taking care to remove the roots of the plants as well. After this, Preen recommends that you mulch the soil to keep moisture and temperature within the area constant, as well as preventing weeds from re-growing. When the weather is dry, the Preen product is then sprinkled on top of the mulch, and then the whole area is watered to activate the ingredient that prevents weeds from growing.

This product is unique in how it creates a layer underneath the surface to stop weeds from growing, even from seeds. In this way, it’s better than a traditional weed killer, which will be great at killing all the weeds you can see but will leave you unable to do anything about the seeds buried underneath the soil.

Pros:
+ Made for killing: nothing – instead, it is a weed preventer. It forms a protective layer to prevent the growth
of broadleaf and grassy weeds for up to six months
+ Best for use on flower beds and shrubbery (read the label to double-check your specific plants)

Why We Liked It – This is unique on our list in that it’s solely made for being a weed preventer. Although it might initially give you more work to do with removing the weeds by some other method, it will also help to prevent them from sprouting up again, which you could argue would save you more work in the future.

Other weed killers you can check out include the Amine Weed Killer, the Southern Ag 2, and Ortho Groundclear.


Weed Killer Buyer’s Guide

First of All: Do You Need Weed Killer?

You do not necessarily have to use herbicides to fight weeds. They are usually far from healthy for the environment in both the short and long terms. Mulching your garden beds will help to prevent weeds from growing, as well as regular maintenance with tools such as hoes and other weeding tools. However, sometimes things get a little too hectic, and there’s no other choice. This is where the products we have listed may come in handy.

It’s always best to only use them as a last resort, but weed killers are, unfortunately, almost an inevitable necessity for the large majority of gardeners.

It’s important to keep weeds at bay to stop them from drawing water and nutrients away from your desirable plants, as well as for aesthetic reasons.

How to Safely Apply Weed Killer

To apply your weed killer, follow the instructions. All different products and brands will have different techniques, quantities, and timescales, which you should follow strictly. Don’t forget, the chances are, the product you’re using is poisonous to some small extent, and it should be treated with respect to be safe.

Senior Gardening

Put all pets and children indoors when applying weed killer, and wear long sleeves, gloves, and goggles to protect yourself. How long you should stay out of the area after treatment will depend on the product, so, yet again, read the label. We recommend as long as possible. It can never hurt to wait too long and make sure that everyone stays fit and healthy. Even with the best weed killers, with the shortest possible drying times, it pays to be cautious.

Quick Things to Bear in Mind

The first and most important aspect of weed killer is always: read the label! Make sure that you apply the right amount to the right areas around the right plants. Not doing this correctly risks causing unnecessary amounts of damage to the plant, yourself and potentially friends, relatives, children, pets, and wildlife that might spend time in that area.

Gardener using Roundup herbicide

Always follow the recommended concentrations on the label. This will make sure that you do not put too much weed killer in one area, and also saves you from using too much product. It is always better to have to spray twice than spray too much in one go.

Some weeds may die after just one application, but these are likely to be lawn weeds. Stronger weeds may need one, two, or even more applications to kill them fully.

Fast weed killers do not necessarily equal the best weed killers. Instead of just grabbing the fastest one you can, think about what weeds you need to get rid of and specialize what you are looking for in that regard.
We have not listed any granular weed killers in our list, as they are generally thought to be less effective than liquid-based ones. This is because a liquid solution can more evenly cover select areas.

It may be obvious to say, but do not use any weed treatment products in the same bottle as fertilizers. Even if there is only a tiny residue remaining, this can kill plants in the future. Use completely separate containers and spray bottles for fertilizers and weed killers.

Be careful when checking how long you have to wait before the area is safe for people and pets. As far as we’re concerned, the longer you wait the better. Also, avoid putting any dead weeds or lawn grasses in your compost pile – you do not want to ingest any of this stuff. It’s really not good for you.

Can I Try Making My Own Weed Killer?

Don’t do any homemade experimentation with chemicals for weed killer. Using randomly put-together things you find at home can seriously damage plants and it’s just not worth the risk. Essentially – it’s a bad idea.

How Do I Protect My Desirable Plants From Weed Killer?

Man spraying fresh weeds in a flowerbed

Cover them, using whatever you have that will prevent spray from landing on the leaves and soil. This could be cardboard, plastic bags, or whatever you can find that will do the job. If you still accidentally spray your plant with a weed killer, no worries! Just wash it off as quickly as you can.

Should I Get Ready-to-Use or Concentrate Weed Killer?

Like many other things, weed treatment products can be bought in either a ready-to-use condition or as a concentrate. Ready-to-use products will usually end up costing you many more bucks per fluid ounce but do not require any extra equipment such as a tank sprayer, or the hassle of having to mix quantities with water or store a large amount for a long time. You should, therefore, consider what kind of gardener you are, and how much weed killer you are likely to need for what you’re doing. The best weed killers for you will be different from someone else.

What are the Best Weather Conditions for Application?

You should look for a sunny, dry day, between 65- and 85-degrees Fahrenheit, with no breeze and no rain forecast for at least 24 hours.

What Different Types of Weed Killer Are There?

You can divide all weed and grass killers into one of three herbicide categories: selective, non-selective, and total vegetation.

Selective herbicides will only kill certain types of weeds, which will be the plants or grass explained on the label.

Non-selective weed killers will kill all types of weeds they come into contact with in sufficient quantity.
Total vegetation herbicides also kill all plant life, but also make the area unable to grow plants for at least a year.

You can also categorize them as either:

Post-emergent products are applied to plants already growing.
Pre-emergent products are applied to areas of the soil before plants sprout through.

The best weed killers for you will depend on what you need them for.

What is 2,4-D? What is Glyphosate?

As we’ve mentioned it in a couple of products, you may wonder what this strange abbreviation is. 2,4-D is an auxin (a plant hormone that makes plants grow). When applied all over a weed, the plant then becomes confused because it tries to grow in all directions, becoming deformed and then dying.

Glyphosate is a non-selective herbicide. It stops plants from creating a specific enzyme, which results in it withering and dying. Studies have found it to be absorbed by the soil in a matter of days, and it’s not directly harmful to wildlife.

Final Tips

Don’t ever apply any chemicals – whether total vegetation, selective or non-selective weed killers – to young lawns because it will likely damage or even kill it. You should wait until the grass is at least six months old before applying any weed killer to your lawn.

The earlier you apply weed treatment products, the more effective they will be.
Building up healthy soil and grass will help to prevent weeds next season, and will mean won’t have to use as much weed killer next time.

We hope this guide has been useful for all your weeding needs. Happy gardening.

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