The best weed killer for lawns: keep troublesome pests at bay for a prize-winning green

Be tough on worrisome weeds, not grass, with our round-up of the best selective and heavy-duty weed killers around

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It’s a story just about as old as lawns themselves: no sooner is the green finally looking tip-top than weeds start to rear their ugly heads all over it. But aside from resolving to deck over the whole thing, there are things you can do to keep weeds under control without harming your beloved lawn beyond repair – we’ve rounded up a selection of the best weed killer for lawns, including solutions for spot-treating and blanket spraying, to help you maintain order. 

While you’ll likely already be acquainted with big brands like Resolva and Roundup, there’s more on the label to be mindful of. Ready to use weed killer can simply be sprayed on to problem patches, and some even come with their own means of distribution, but be sure to read the directions on undiluted weed killer carefully to make sure you get the right concentration.

Whatever type you choose, there are a few general guidelines to follow. First, find out in advance if there’s likely to be inclement weather within 24 hours of application, and if so, take a rain check, as a downpour will lessen the effectiveness of the treatment. Then, be sure to take care following application to keep children and pets off the lawn for the time recommended by the manufacturer.

The best weed killer for lawns

1. MO Bacter Organic Lawn Fertiliser 7.5kg

Fertilise, scarify and weed in a single step with our best lawn weed killer

Best for: All-in-one
Type: Fertiliser/weed-killer
Amount: 7.5kg
Reasons to buy
+ Fertiliser and weed killer in one + Destroys dead material such as thatch 

Yes, you read that right. Our first-choice weed killer might be a fertiliser, but as well as encouraging new growth in all the right places, it inhibits it where it counts. That is to say, in the process of slowly releasing nutrients over twelve weeks to sustain grass growth, its high potash content sees to it that stubborn moss is destroyed, and prevents the development of new patches. It also contains bacilus subtilus sp which is said to consume dead material like thatch, meaning less of your time spent scarifying. 

Weedol Lawn Weedkiller Gun

2. Weedol Lawn Weedkiller Gun 1L

From dandelions to daisies, no weed is overlooked by this weed killer spray

Best for: Targeted action
Type: Spray gun
Amount: 1L
Reasons to buy
+ Effective on all broad-leaved pests + Only needs one application per season 

Using a unique combo of three selective herbicides, Weedol weedkiller is formulated to target the most commonly occurring culprits when it comes to weedy lawns, killing dandelions, daisies and clover as well as lesser-known (but no less irritating) creeping buttercup, hogweed and others. It works by targeting weeds at the roots, and only requires one treatment per season to do its job, making it one of our most foolproof formulations. 

Roundup Fast Action Weedkiller Pump n Go Spray

3. Roundup Fast Action Weedkiller Pump n Go Spray 5L

Lots of ground but little time? Take this fast-action weed killer for a whirl.

Best for: Deep-rooted weeds
Type: 5L
Amount: Spray
Reasons to buy
+ Ready to use straight away + Degrades in soil 

If you’re looking for a blanket spray rather than a spot treatment, this Roundup weed killer might be your guy. Ready to go in more ways than one, it doesn’t need diluting, nor does it need decanting into a fine-rosed watering can. It’s not quite as selective as our previous pick, but it’s tops for getting the job done quickly and effectively without leaving any harmful residue to be sucked up by future plants, promising to kill weeds and their roots in just 1-2 days, and degrading in the soil with the help of microorganisms. 

Weedol Rootkill Plus

4. Weedol Rootkill Plus

Effective immediately, this Weedol weed killer gets straight to work

Best for: Inhibiting regrowth
Type: Spray
Amount: 3L
Reasons to buy
+ Tackles weeds at the root + Convenient included sprayer 

According to reviewers (and to Weedol) Rootkill Plus is powerful stuff – it promises visible results within just 24 hours, which users attest to, but it’s far from just a speedy slapdash solution. Withering the whole of the weed from the tip down to the roots so that it can’t come back, gardeners found it worked wonders on stubborn bindweed and even brambles, and loved the convenience of the large container with its accompanying sprayer. 

Resolva 24H Ready to Use Weedkiller

5. Resolva 24H Ready to Use Weedkiller

With its herbicide buddy system, this quick killer makes short work of weeds

Best for: Fast-acting
Type: Spray
Amount: 3L
Reasons to buy
+ Unique, effective combination of herbicides + Fast-acting formula 

Like our previous pick from Weedol, the Resolva 24H Ready to Use Weedkiller claims to kill weeds in – yep, you guessed it – just 24 hours. In fact, when you take into account the matching three-litre ready-to-use spray, super fast action and promise to annihilate weeds from root to tip, they’re more alike than different. Where this particular weedkiller comes in handy is with its combination of herbicides diquat and glyphosate, with the former being included to make the latter work more quickly and effectively, great if you’re in a rush to get the lawn in tip-top condition. 

Gallup Home & Garden Weed Killer

6. Gallup Home & Garden Weed Killer

Get a gallop on with this fast-acting weed killer

Best for: Professional strength
Type: Liquid concentrate
Amount: 2L
Reasons to buy
+ Industrial strength + Adept at clearing big areas 

This Gallup offering’s big selling point is that it’s the strongest weed killer available to buy online in the UK, and professional gardeners and recreational users alike confirm its weed-whacking prowess, saying it kills absolutely everything – that is to say, it’s non-selective, so to ensure it only kills everything you want it to, apply to the leaves of your target. However, users found it was incredibly effective on bindweed, and if you’re looking to clear a lot, such as overgrown shrubs or even an entire lawn, if you’re looking to put down turf or a vegetable garden, it’s unparalleled for power. 

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