Best weed killers: weed killers for beautiful lawns

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

The best weed killer for lawns

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. 

Need advice on maintaining a picture perfect lawn? Find out how to mow a lawn and visit our garden hub page.

What to consider when buying weed killer

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. Best weed killer for lawns: MO Bacter Organic Lawn Fertiliser 7.5kg

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

Specifications
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. 

Shop more lawn fertiliser at Amazon

Weedol Lawn Weedkiller Gun

2. Best weed killer spray: Weedol Lawn Weedkiller Gun 1 litre

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

Specifications
Best for: Targeted action
Type: Spray gun
Amount: 1ltr
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. 

Shop more weed killer at Amazon

Roundup Fast Action Weedkiller Pump n Go Spray

3. Best quick weed killer: Roundup Fast Action Weed Killer Pump n Go Spray 5 litre

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

Specifications
Best for: Deep-rooted weeds
Type: 5ltr
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 one to two days, and degrading in the soil with the help of micro-organisms. 

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Weedol Rootkill Plus

4. Best weed killer for immediate results: Weedol Rootkill Plus

Effective immediately, this Weedol weed killer gets straight to work

Specifications
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. 

Shop more weed killer at Robert Dyas

Resolva 24H Ready to Use Weedkiller

5. Best ready to use weed killer: Resolva 24H Ready to Use Weed Killer

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

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

Like our previous pick from Weedol, the Resolva 24H ready to use weed killer claims to kill weeds in – yep, you guessed it – just 24 hours. In fact, when you take into account the matching 3 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. 

Shop more weed killer at Wilko

Gallup Home & Garden Weed Killer

6. Best powerful weed killer: Gallup Home & Garden Weed Killer

Get a gallop on with this fast-acting weed killer

Specifications
Best for: Professional strength
Type: Liquid concentrate
Amount: 2ltr
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. 

Bayer Garden superfast weed killer

(Image credit: Bayer Garden)

7. Best natural weed killer: Bayer Garden Superfast Weed killer

Powerful but natural formula that won't harm wildlife

Specifications
Best for: natural and eco-friendly gardens
Type: Liquid concentrate
Amount: 1ltr, 3ltr
Reasons to buy
+Effective+Natural, bee-safe formula 
Reasons to avoid
-Still a very strong product that may harm young plants

This weed killer uses powerful natural enzymes to fight weeds, and is the better option for eco-conscious gardeners. Users report high efficacy and no harm to garden wildlife or bees; however, this is a strong product, so be careful not to spray it on young, delicate plant growth. 

Buy more natural weed killer at Amazon

Westland Safe Lawn pet and child safe lawn feed

(Image credit: Westland)

8. Best pet safe weed killer:

Specifications
Best for: gardens used by pets and children
Type: granules
Amount: 2.8kg, 5.25kg ,14kg
Reasons to buy
+More than just a weedkiller+Safe and natural formula
Reasons to avoid
-A bit smelly

This brilliant product from Westland is a holistic all-in-one feed for your lawn; not only will it prevent weeds and moss, it will also condition your garden, making it look healthy and fresh. Most importantly, it is guaranteed to be safe to use around children and pets. Users report high efficacy, but some notice an unpleasant smell. However, the smell does fade over time. 

Shop more pet safe weed killer at Amazon

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