7 Best Weed Killer for Lawns 2020 Reviewed

Lawn weeds are a real pain in your beautiful yards, flowerbeds, driveways, sidewalks, and patios. Also, choosing the best weed killer for lawns is a daunting task. Best Weed Killers for Lawns

For instance, any non-selective and flower bed weed killers kill both weeds and the lawn grass; non-selectively. 

Experts advise various weed killers for different circumstances to help you maintain lush and healthy grass in your lawn. Below, I’ve reviewed the best weed killer for lawns

Let’s get started!

Reviews: 7 Best Weed Killer for Lawns 2020

By definition – Weeds are plants (without botanical consequence) that are growing in an unwanted place or situation including any human-controlled environments like lawns, and gardens. But, to help you identify the different weed, check this weed ID tool.

(1) Weeds compete with your lawn grass for sunlight, land, and water, (2) Weeds create many dormant seeds that’ll survive through the cold and heat seasons, (3) Sadly, once weeds attack your lawn, you’ll have lost most of its beauty, and (4) Weeds are also quick in reproduction and spreading. 

1. Compare-N-Save Weed Killer, 41% Glyphosate – Our Top Pick

Compare-n-save is my best weed killer for the lawn – including broadleaf weeds, grasses, woody shrubs, cinquefoil, bindweed, and white clover. The pre-emergent herbicide has 41% Glyphosate (a non-selective water-soluble ingredient) to prevent the production of growth proteins. 

Compare-N-Save Concentrate Weed Killer, 41% Glyphosate Check Price on Amazon

Also, it leaves no residual activity on lawns. You can actually plant some flowers a day after application. You can spray the compare-n-save concentrate on your driveways, lawns, orchard, and walkways.

Expect some positive results (weeds dying) in 2-4 days after application. However, the whole weeds collection will be dead in 1-2 weeks – your lawn should be completely weed-free in about two weeks. 

Caution; (1) Apply Compare-n-save on a sunny day with temperatures being over 60 F. Further, ensure there is no rain forecast in the coming 24 hours, before applying the weed killing formula. (2) Should you, however, want to use it on your vegetable or fruit garden, you will need to be careful when spot-spraying to avoid dripping the herbicide on your crops. 

Compare-n-save will kill both the perennial and annual weeds getting to the depth of their roots. Glyphosate ensures that the leaves (or foliage) quickly absorbs the herbicide, move to the roots and kill the weeds and the whole plant. 

But Compare-n-save is a non-selective weed killer and thus will kill any green plants that contact it – but focus largely on the weed’s leaves and foliage. Also, don’t spray on the valuable plants and lawn grass – only target the weeds. 

Application procedure? Well, dilute 1 gallon of  Compare-n-save with water to produce a spray solution of about 85 gallons. Luckily, 1 gallon of this Compare-n-save concentrate can treat 25,000 square feet. 

Related: Best Drain Cleaner

2. Scotts Halts 41% Glyphosate (Pre-emergent Weed Killer) – Runner-Up

Weeds will constantly attack your neatly manicured lawn or flower beds – which is It’s quite offensive. Fellow lawn lovers should regularly use preventive methods against these unyielding weeds. Its long residue effect will keep your lawn weed-free for about 6 months. 

Compare-N-Save Concentrate Weed Killer, 41% Glyphosate Check Price on Amazon 

It’s also advisable to apply Scotts Halt’s weed killer in the dry season as this will naturally inhibit the germination or growth of weeds – but the efficacy of this herbicide is largely not affected the weather. 

Being the powerful pre-emergent weed killer, Scotts Halts will prevent any nasty chickweed, henbit, crabgrass, etc from sprouting from your established lawn. Equally important is that this herbicide won’t kill any of the established flowers or grass in the yard. 

Application & Coverage, there are packages of this Scotts Halt weed killer that’ll easily cover between 2,500 square feet (if your lawn is small) to about 17,000 square feet (for a bigger lawn) at a budget-friendly price. Further, apply Scotts Halts bi-annually (allowing a twelve weeks’ break) will ensure you get the best value. 

Luckily, just like with the Roundup 5725070 weed killer, Scotts Halts is rainproof and thus its effectiveness in killing the weeds in your lawn won’t be affected by rains or wet weather. Therefore, I found it to be a powerful all-year-round weed killer including during fall, spring, heat, or rain weathers. 

Scotts Halts contains Pendimethalin, which makes it a great selective herbicide to hinder the germination of weed seeds. The downside is that you won’t be able to successfully plant any other seeds in 6 months. 

Therefore, Scotts Halt’s herbicide will only inhibit the growth of new weeds but won’t kill the already grown weeds. But it has a long residue effect (roughly 6 months) but it won’t harm other grown plants, crops, and flowers. 

On application, start by mowing the area and removing all the grown weeds. Next, now spread the appropriate Scotts Halts herbicide using the provided spreader. Finally, water your lawn to activate the weed killer. Remember, your lawn will remain clean for about 6 months – no new seed germinations will happen. 

3. Roundup Concentrate Plus Weed and Grass Killer

Roundup is a popular brand for herbicides that’s a vegetation killer, which implies that it’ll kill flowers, grass, and weeds too. Roundup Concentrate Plus contain Diquat (0.73%) & Glyphosate (18%), which makes the weed killer a great systemic and contact herbicide. 

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Roundup Concentrate Plus attacks both the weed’s roots and foliage (absorbed by leaves and stems) to hinder further growth and reproduction in the yard. The perennial weeds begin dying in 12 hours to 2 weeks (such as quick knockdown effect due to its FastAct technology). 

To kill many weeds, any fasts, apply Roundup Concentrate Plus in summer, hot/warm weather. But it’ll still give you good results if you apply the herbicide 1 hour the before rains begin. If you do this, the active ingredients (Glyphosate – 18%) will already have been absorbed into the weeds’ system – through the leaves, steam, and roots. 

Roundup Concentrate Plus is more pricey compared to Compare and Save but will act fast on the weeds in your lawn. Further, the 16 ounces of the herbicide concentrate will easily make 3 gallons to kill weeds in an area of roughly 1,500 square feet.

On selectivity, the herbicide will kill all plants on contact and thus you must be careful not to spray on your flowers or other useful crops. But if you spray on the leaves of your crops, then just rinse its leave stem with water. You can use it on lawn, hedges, pathways, fences, and driveways.

Despite that some limited concentrate may leach into the soil, it won’t significantly affect its PH (including acidity and alkalinity) or vary its chemical composition as to pose a danger to humans and the other animals.

4. Roundup 5725070 Extended – a Pre-mixed Weed killer

Next up on best weed killer for lawns is Roundup 5725070 that’s fast-acting (kills weeds in 3 hours) for extended weed control. It’s a double-action formula and thus kill the weeds will foliage and prevents seeds from sprouting for 4 months.

If you’re in the rainy or wet areas, Roundup 5725070 will avoid wetting/ washing away/ being diluting for roughly 10 minutes. Besides, this herbicides come ready-to-use and not as a concentrate that requires mixing.

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Roundup 5725070 will exterminate broad-leafed weeds attacking them from their roots upwards – in just 3 hours. It’s also easy to use – has an extendable wand and detailed application guide. 

On aplication, the 1.33 gallons package of the herbicide will weed-treat an area of 400 square feet. But, if your lawn is heavily infested by weed, you’ll require to be a little generous with the herbicide amount you’ll use. 

On selectivity, Roundup 5725070 will kill all crops and lawn grass sprayed, and thus you must be extra careful when applying. Its exceptional pump allows lawn owners to easily control the herbicides output and thus spray only the desired weeds and not other crops.

Roundup 5725070 is a dual-action formula. This means that it’s both a pre-emergent (kills weed sprouts before emerging from the soil) and a post-emergent (kills existent weeds) – all for about 4 months. Further, the weed killer will be rain-proof for about 10 minutes – this means that it’ll be effective if the rains won’t start in 10 minutes of its application. 

The weed killer has a quick action time – you’ll see positive results (weeds dying) within 3 hours after applying the Roundup 5725070 formula. Also, the formulation will dry (wither) all the sprayed weeds in just 2 days because it’ll destroy them both from the root and the foliage (leaves). 

As a broad-spectrum herbicide, Roundup 5725070 will kill all weeds effectively on the edges of various hard surfaces including sidewalk, patios, decorative rocks, natural fence, or driveway, wall cracks while leaving your grass intact. However, the residue of this herbicide won’t affect the PH (acidity or basicity) of the soil in your lawn.  

5. Ortho GroundClear Herbicide – Weed Killer Concentrate

Ortho GroundClear is a fast-acting non-selective herbicide that’ll kill both the weeds and other plants it contacts (it literally clears your ground). It has a long residue effect (about 12 months) and it’ll attack the vegetation both from the leaves and the roots. Besides the lawn, use it on the walkway or patio. 

Ortho GroundClear Vegetation Killer Concentrate Check Price on Amazon 

Lawn lovers report that Ortho GroundClear is also highly effective against perennial weeds like dandelion, the white clovers, and crabgrass in just single spraying session. However, the herbicide is non-toxic to human beings and any of your household animals. 

On selectivity, the Ortho GroundClear concentrate contains non-selective active ingredients (0.08%-Imazapyr and 5.0%-Glyphosate) that’ll penetrate the foliage, stems, and roots. The herbicide is effective in weed-treating large lawns so shun the lawn mower, tillers or slashers and go the easy weed killer way. 

On safety, the herbicide is very safe weed killer to use – both for humans and pets. For example, the herbicide won’t irritate the human respiratory system or skin. Further, it’s safe to the environment, children, cats, your lovely fish, and dogs. 

So, what area will the Ortho GroundClear cover? Well, here is the outline; – 32 oz. (for 75 square feet), 1 gallon (for 300 square feet), and 2 gallons (for 600 square feet). However, use a more generous measure of the herbicide, if the lawn is heavily infested with weeds. 

But Ortho GroundClear recommended for treating patios, walkways, and driveways since it has limited capability. Further, avoid spraying on flowers and useful vegetation since it’ll cause soil contamination and thus hinder plant development in the coming days. 

The herbicide has a quick action time (roughly 4 hours) and the weeds will have dried in the next 3 days after the initial application. But the chemical will leave a residue that may affect the soil and thus to plant other crops or grass, you must wait for like 3 days.

Ortho GroundClear is also rainproof for about 1 hour. Therefore, if you apply the herbicide 1 hour prior to starting of the rain, then the active ingredients will have been taken up into the plant’s system. The herbicide will prevent the weed infestation including shrubs and grasses for about 1 year. 

6. Southern Ag 2, 4 – D Amine Weed Killer –  Best Selective Weed Killer

Finally, on our best weed killer for lawns is Southern Ag 2 that’s a highly selective herbicide that’ll kill weeds in your lawns, particularly the broad-leaf weeds (such as clover, chickweed, poison ivy, dandelions, etc) woody plants, and grasses.

On action time, the herbicide will kill the weeds in about 3 days. The herbicide is primarily composed of 2,4D, Mecoprop, and the Dicamba formulation. 

Southern Ag 2, 4 - D Amine Weed Killer -  Best selective weed killer Check Price on Amazon

Luckily, you can spray Southern Ag 2 in many areas of your homestead including golf courses, animal pastures, and sidewalk. You’ll require to mix about 1 tablespoon of this herbicide with 1 gallon of water to effectively weed-treat roughly 330 sq. ft.

Therfeore, Southern Ag 2 is a budget-friendly concentrate since the 32 oz bottle can last you more than a year of effective weed treatment in your lawn. Luckily, Southern Ag 2 won’t kill your lawn grass since it mainly targets the woody plants and broadleaf weeds. 

On safety, Southern Ag 2 won’t affect the chemical composition or PH of the soil in your lawn. However, you must use low pressure when spraying to avoid dripping the herbicide onto any of your useful plants that are also broad-leafed since this would kill them too. 

On aplication, Southern Ag 2 is super simple to reconstitute and apply on your lawn or sidewalks. The weed killer packaging has very elaborate usage instructions. Identify the patch of weeds in your yard and then spray on them directly without dripping the herbicide on your useful plants. 


    1. Focus on Weed Control: Herbicides as Weed Control Agents  – NCBI 
    2. Weed Control in Home Lawns
    3. Weed Management in Turf – Penn State 
    4. 2,4-D transport and herbicide resistance in weeds – NCBI 
    5. Alternatives to herbicide use in weed management – PAN Europe 
    6. 2,4-D Weed Killer Toxicity, Use in Herbicides and Potential Dangers -NRDC


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