Best weed killer 2020: the best products for achieving the perfect lawn

The best weed killer will rid your lawn of fast-spreading weeds without harming the grass. We've selected the best and safest products for you to try

best weed killer: garden with a large lawn and lots of plants
(Image credit: Annabelle Grundy )

Looking for the best weed killer? Although a couple of weeds here and there in a small garden can easily be pulled by hand, owners of large gardens will know that pulling weeds can quickly become a losing battle. 

We’ve selected the best weed killers on the market, considering both effectiveness and ease of use. They are quite different from one another, and some are more eco-friendly than others. Whether you want your weed killer to do its job speedily and efficiently, or your main concern is its safety and minimal environmental impact, we have them all on our list. 

To make sure your lawn is in tip-top condition, read our guide on how to mow a lawn, too. 

What is the best weed killer? 

The best weed killer on our list is the Mo Bacter Lawn Fertiliser: it conditions your lawn while tackling troublesome weeds. For a natural option, try the Bayer Garden superfast weed killer. No time to read through our buyer's guide? Here are our top weed killers for lawns at a glance: 

  • Best weed killer for lawns: Mo Bacter Organic Lawn Fertiliser
  • Best weed killer spray: Weedol Lawn Weedkiller Gun
  • Best quick weed killer: Neudorff Superfast Weed Killer
  • Best weed killer for immediate results: Weedol Rootkill plus
  • Best ready to use weed killer: Resolva 24H 
  • Best natural weed killer: Bayer Garden Superfast Weed Killer
  • Best pet safe weed killer: Westland Child & Pet Friendly SafeLawn

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 killers

The best weed killer for lawns

1. MO Bacter Organic Lawn Fertiliser 7.5kg

Best weed killer for lawns: 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. 

Shop more lawn fertiliser at Amazon

Weedol Lawn Weedkiller Gun

2. Weedol Lawn Weedkiller Gun 1 litre

Best weed killer spray: from dandelions to daisies, no weed is overlooked by this weed killer spray

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

best quick weed killer: Neudorff Superfast Weed Killer

(Image credit: Amazon)

3. Neudorff Superfast Weed Killer

Best quick weed killer: kill the most stubborn weed species with this quick-acting spray

Best for: Stubborn weeds such as horsetail
Type: 750ml
Amount: Spray
Reasons to buy
+Easy and safe to use+Low toxicity to bees+Works even in low temperatures

This hardworking targeted weed spray from Neudorff is especially effective against stubborn, quick-spreading weeds such as goutweed and field horsetail. Delighted users report that this works wonders against these weeds where other weed killers fail to eradicate them. It also works in temperatures as low as 5°C, which means you can go ahead and eradicate weeds on your lawn without needing to wait until late spring. What we really like about this spray, though, is that despite being so fast-acting and effective against tough weeds, it's relatively gentle on the soil in your garden and has low toxicity to bees. High effectiveness, low environmental impact? Yes, please. 

Shop more weed killer at Amazon

Weedol Rootkill Plus

4. Weedol Rootkill Plus

Best weed killer for immediate results: 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. 

Shop more weed killer at Robert Dyas

Resolva 24H Ready to Use Weedkiller

5. Resolva 24H Ready to Use Weed Killer

Best ready to use weed killer: with its herbicide buddy system, this quick killer makes short work of weeds

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

These are the weeds you may choose to keep

1. Dandelion: highly beneficial to pollinators, and the leaves and flowers are edible.
2. Clover: very important to pollinators, it helps condition your lawn by improving nitrogen levels in the soil.
3. Chickweed: an important source of pollen in the spring, it’s also edible and tastes much like lettuce. Beneficial for lawns. 

Bayer Garden superfast weed killer

(Image credit: Bayer Garden)

6. Bayer Garden Superfast Weed killer

Best natural weed killer: powerful but natural formula that won't harm wildlife

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)

7. Westland Child & Pet Friendly SafeLawn Natural Lawn Feed

Best pet safe weed killer:

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

Read more:

DIY weed killer recipes

If you’re not sure whether you want to use a commercial weed killer, try these simple, eco-safe remedies:

  • Pour boiling water on the weeds.
  • Add table salt to a solution of dishwasher liquid, and pour over the weeds.
  • Always mulch your borders, which will prevent weeds from spreading on to your lawn.