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Best Lawn Weed Killer: How to Kill the Weeds But Not the Grass

By Tim Stephens

In this article, we’re going to look at the best lawn weed killer, because, well, nothing ruins the look of a well cared for lawn like weeds.

They’re not only an eyesore, but they also steal vital nutrients from the soil. Nutrients that should be there to benefit the grass.

Pulling stubborn weeds like Dandelions can be difficult as the roots can break, leaving them to grow back later on.

For many lawn owners, it’s just easier to apply a weedkiller, especially if the lawn is riddled with weeds. But you need to be very careful when choosing a weed killer for your lawn. Use the wrong one or the wrong dose and you could end up with a dry, brown, dead patch of grass!

 

The Best Weed Killer For Lawns: My Top Picks


If you’re in a rush and you just want to know which products I recommend, take a look at the table below.

You can click the buttons to go and buy the products, or click on the ‘My Review’ link and you can read my review of the product.

 

best weed killer for grassScotts Weedol For Lawns: One of The Best Weed Killer Concentrates

– Easy to Mix and Apply
– Kills Most Broadleaf Weeds
– It Just Works

View on Amazon.co.uk

Or Read My Review


 

best lawn weed killerResolva For Lawns: Brilliant as a Secondary Weed Killer

– Easy to Spread
– Especially Effective Against Clover
– Very Good Product

View on Amazon.co.uk

Or Read My Review


 

best granular weed killerEvergreen 4-in-1: Good For Controlling Weeds

– All in One Feed, Weed & Moss Killer
– Easy to Spread
– Good For Controlling Weeds

View on Amazon.co.uk

Or Read My Review

 

Weed Killer For Grass vs. Regular Weed Killers


In the introduction to this article, I said that you need to be very careful when choosing a weed killer for your lawn.

Choose the wrong type and you’ll not only kill the weeds, but you’ll also kill the grass.

So what kind of weedkiller should you use?

Use a Selective Weedkiller

A weed killer for grass is also known as a ‘selective weed killer’. Selective weed killers lack a key ingredient that most other weed killers don’t.

That ingredient is Glyphosate.

Glyphosate is the active ingredient which makes a weedkiller non-selective, meaning it will kill any (or most) green plants that it touches.

Selective weedkillers contain different active ingredients. They are capable of killing a wide range of broadleaf weeds, including; Plantains, Pearlwort, Daisies, Yarrow, Chickweed, Sorrel, Thistles and others, without harming turfgrass.

If used properly!

Even selective weedkillers can damage grass if used improperly so always read the instructions!

How to Know You’re Buying Lawn Weedkiller Instead of a Non-Selective Type

So now you know you need a selective weedkiller to kill weeds without damaging your lawn. But how do you know a particular weed killer is safe to use on your lawn?

Well, the answer is dead simple.

It’ll say so on the packaging.

This might sound blatantly obvious but websites like Amazon are awash with negative product reviews complaining that the weedkiller they used killed their grass when in actual fact, they bought the wrong product.

So if you need a weedkiller for your lawn, make sure it says it’s made for lawns on the packaging.

Or, just choose one of the products on this page.

 

Which is the Best Lawn Weed Killer, Liquid or Granular?


types of lawn weed killer

Selective weed killers come in both liquid and granular versions, so which is best?

Liquid Weedkillers

Liquid weed killers are the most common and they also offer more flexibility in terms of how you can apply them.

You can buy them in two ways;

Weedkiller Concentrate

These are made to be diluted in water and applied via a watering can or knapsack sprayer.

They’re best for treating the whole lawn, either in the spring or autumn. They’re ideal if your lawn has quite a few weeds inhabiting it.

Most weedkiller concentrates can only be applied once a year. However, different brands have different active ingredients which means you can spray your lawn twice a year, each time with a different brand.

Spot Spray Weed Killers

Spot spray weedkillers don’t need mixing.

They come in a spray bottle and are perfect for blasting individual weeds. Ideal if you only have one or two in your lawn.

Also, because you don’t typically apply these to your whole lawn, you can use them whenever you need to.

Granular Weed Killers

There are very few granular weed killers on the market.

They typically come as part of a lawn feed and weed type of product but rarely as a stand-alone weedkiller.

If you don’t have many weeds in your lawn and you prefer feed and weed products instead of applying a separate fertiliser and weedkiller, then, by all means, use one.

However, if your lawn is currently inhabited by lots of weeds, a feed and weed probably won’t help.

Use a concentrate instead.

 

Best Lawn Weed Killer: Reviews of My Top Picks


Now we’ve talked about the different types of weed killers, here are my top picks.

1. Scotts’ Weedol Lawn Weedkiller Review: One of the Best Lawn Weedkillers There Is

best lawn weed killer concentrate

Formally known as Verdone, Weedol Lawn Weedkiller is a fantastic product for home use.

How it Works

Because Weedol doesn’t contain Glyphosate, it is safe to use on lawns. Instead, it’s active ingredients are;

  • Fluroxypyr
  • Clopyralid, and
  • MCPA

It works by stimulating the weeds’ growth hormone and causing the plants’ cells to grow much faster than they can sustain. As a result, the cell walls collapse and the plant dies.

In the days after application, you may notice the weeds growing. This is meant to happen and the weed will soon die.

What I and Other Users Think About Weedol Weedkiller For Lawns

Weedol works, it’s as simple as that.

Which is why it is rated so highly on shopping sites.

However, because of the active ingredients that Weedol uses, it might not rid your lawn of every last weed on the first use. Tough weeds like Speedwell might take a few doses or a dose of another type of weedkiller like Resolva that uses different active ingredients.

Despite online reviews being overwhelmingly positive, there are one or two complaints from customers.

The first one being the time it takes for weeds to die. It can take a week or so for the weeds to die and a couple of weeks for the plant to wilt away. However, this is due to the fact that it doesn’t contain Glyphosate.

Also, some people complain that the concentrate either doesn’t kill the weeds or it kills the grass too. My guess is that these users mixed it either too weak or too strong.

If you mix it as per the instructions on the box you’ll have no issues.

Overall Thoughts

In my opinion, Scott’s Weedol is one of the best lawn weed killers around for home use.

I always have a bottle of concentrate and spot spray in the shed.

That’s said, they’re not the only bottles I keep…

 


 

best weed killer for grassScotts Weedol For Lawns: Probably The Best Weed Killer There Is

– Easy to Mix and Apply
– Kills Most Broadleaf Weeds
– It Just Works

View on Amazon.co.uk

 


 

2. Resolva Lawn Weed Killer Review: Works Brilliantly Alongside Weedol

best grass weed killer

Resolva Lawn Weedkiller is another excellent product and is ideal for use alongside Weedol.

How it Works

The active ingredients in Resolva are different to those in Weedol. It contains;

  • Mecoprop-P and
  • Dicamba

Ordinarily, you should only spray the lawn with a concentrated weed killer once a year. But because the active ingredients in Resolva are different to Weedol, it means you can use each of them once per year which gives you two treatments.

It also means you can use this weedkiller to get on top of any weeds that Weedol might not have killed the first time around.

What I and Other Users Think About Resolva Lawn Weed Killer

If I could only buy one weedkiller, I’d choose Weedol.

That said, because Resolva can be used alongside Weedol, it gives me double the chances of ridding my lawn of weeds. As such, I always have a bottle of concentrate and spot spray next to my Weedol.

Other users really like it too. Many comments say that it’s especially effective on clovers.

Overall Thoughts

As I said, Weedol would always be my first choice but Resolva gives me that extra application and chance of killing off as many weeds as possible.

Therefore, I highly recommend it as a secondary weed killer.

 


 

best lawn weed killerResolva For Lawns: Brilliant as a Secondary Weed Killer

– Easy to Spread
– Especially Effective Against Clover
– Very Good Product

View on Amazon.co.uk

 

 

 

3. Evergreen 4-in-1 Review: The Best Granular Weed Killer

evergreen 4 in 1 complete

While it’s more of an all in one feed and weed and not a dedicated weed killer, Evergreens’ 4-in-1 is a solid product for keeping on top of the weeds in your lawn.

How it Works

This is a granular product that can be spread over your lawn either by hand or with a spreader.

The active weed-killing ingredients are:

  • MCPA and
  • Mecoprop-P

These are combined with Nitrogen and Potassium which aids the growth of grass. However, they will also cause the weeds to grow fairly quickly. This is nothing to worry about as they will twist up and die.

What I and Others Think

First, if you have a weed problem Evergreen 4-in-1 isn’t going to fix it. You’ll need to get on top of them first by using the other weedkillers in this article.

Only then will this product be effective in controlling weeds.

You also need to be aware that as this product also controls moss, it contains iron which can stain pathways so be careful when applying.

Apart from that, Evergreen 4-in-1 is very highly rated. It does a good job of controlling weeds, moss and thickening the grass.

Some people have complained that the product scorched their grass. This is due to the high Nitrogen content and the fact that the user either applied too much or applied it in the middle of a hot, dry spell in the summer.

If you follow the instructions, you shouldn’t have a problem.

Overall Thoughts

Evergreen 4-in-1 is a good product and is effective at controlling weeds in a relatively weed-free lawn.

However, only use it as a method of control. If there are a lot of weeds currently residing in your lawn, use a combination of Weedol and Resolva.

 


 

best granular weed killerEvergreen 4-in-1: Good For Controlling Weeds

– All in One Feed, Weed & Moss Killer
– Easy to Spread
– Good For Controlling Weeds

View on Amazon.co.uk

 

 

How to Use Weedol and Resolva Together For Best Results


Ordinarily, you should only apply a concentrated weed killer to your lawn once a year, either in the spring or in the autumn.

However, because Weedol and Resolva have different active ingredients, it’s perfectly safe to apply each one once a year. This means you can treat your lawn twice a year.

Using Weedol and Resolva Concentrates

best weed killer for grassIn the spring, when the weeds are actively growing I’ll treat a lawn with Weedol concentrate.

Then, once autumn rolls around I’ll treat the lawn again but this time I’ll use Resolva concentrate.

This doubles the chances of killing all the weeds in my lawn.

Using Weedol and Resolva Spot Spray

best lawn weed killerConcentrated weed killer takes care of my bi-annual treatments.

But what about weeds that might pop up during the growing season?

This is where the ready-made, spot spray weed killers come in very useful. I always keep a bottle of Weedol and Resolva in the shed next to the concentrated solutions.

If and when a weed pops up, I’ll give it a blast with Weedol which normally does the trick and kills the weed. However, some weeds like Speedwell are pretty resilient and may hang around, in which case I’ll give it another blast a few days later with the Resolva.

 

Why and When Weed Killers Don’t Work


If you’ve spent any time looking on Amazon, B&Q or other shopping sites you might see negative reviews complaining that a particular weed killer didn’t work.

You’ll see the reviewer blaming the quality or strength of the product and comparing them to professional weedkillers like Holster or Bastion.

In actual fact, the active ingredients in professional weed killers are exactly the same as the ones you’ll find in weed killers for home use.

Yes, an amateur weedkiller concentrate might not be as strong as a professional product and that is for reasons of safety. That said, all it means is that you need more concentrate to dilute into water than you would a professional product.

For example, an amateur weed killer concentrate might take 1 part concentrate to 3 parts water to make the desired strength.

A professional weed killer concentrate might only take 1/2 part concentrate to 3 part water but the strength of the two mixtures is exactly the same.

So the mixing instructions provided by the manufacturer will give you a perfectly good weedkiller every time. But only if you mix it as per the instructions.

The Biggest Reasons For Lack of Success With Weed Killers

People fail with concentrated weed killers for one of two reasons;

  1. They mix them too strong so they kill the grass
  2. They mix them too weak so they don’t kill anything

There are several reasons why you might not dilute a concentrated weed killer properly.

Firstly, many people make a stronger mix than necessary because they believe it will kill stubborn weeds quicker. It won’t, it’ll just kill the grass too.

Secondly, (and this is the reason many people mix it too weak) many users don’t get an accurate measurement of their lawn. They completely underestimate how big their lawn is and only use enough concentrate for 30 square meters when in fact their lawn is 50 square meters.

To ensure success, always measure your lawn so you know how much concentrate you need to mix in how much water. And always dilute the concentrate as per the manufacturer’s instructions.

That way, you can’t really go wrong.

For more information on how to accurately dilute weed killer concentrate, watch this video by The Lawnsmith.

 

In Conclusion


My favourite weed killers are:

 

best weed killer for grassScotts Weedol For Lawns: One of The Best Weed Killer Concentrates

– Easy to Mix and Apply
– Kills Most Broadleaf Weeds
– It Just Works

View on Amazon.co.uk

Or Read My Review


 

best lawn weed killerResolva For Lawns: Brilliant as a Secondary Weed Killer

– Easy to Spread
– Especially Effective Against Clover
– Very Good Product

View on Amazon.co.uk

Or Read My Review


 

best granular weed killerEvergreen 4-in-1: Good For Controlling Weeds

– All in One Feed, Weed & Moss Killer
– Easy to Spread
– Good For Controlling Weeds

View on Amazon.co.uk

Or Read My Review

If I could only choose one, it’d be Weedol concentrate but I keep the concentrated and spot spray versions of both Weedol and Resolva in my shed and I use them regularly.

I rarely use Evergreen 4-in-1 because as a qualified groundsman I’ve always fed my lawn, killed weeds and killed and removed moss as separate treatments. It’s just the way I prefer to do things.

But if you want to save time then as an all in one feed, weed and moss killer, it’s very good.

Just make sure you follow the instructions given by the manufacturer’s so you kill the weeds without damaging the grass.

Over to You

I hope this article has helped you choose the best lawn weed killer for you and your lawn.

Do you have a favourite weed killer that I haven’t mentioned?

Or do you have any questions that I haven’t answered in this article?

I’d love to hear your thoughts and experiences so leave a comment below.