In this guide we’ll look at the best moss killers for UK lawns.
I’ve compared effectiveness, timing, ingredient safety and cost
to give you my top recommendations.

What Is The Best Moss Killer?

In a rush? Here’s my top choice…

Pro-Kleen Premium Iron Sulphate Lawn Moss Killer

Goodbye moss, hello beautiful, healthy lawn!

This Pro-Kleen Premium Iron Sulphate Lawn Moss Killer offers great value for money; this one resealable pot will cover 2500 m²! Loads of potential for eliminating moss from your lawn, plus it will fertilise your grass at the same time!

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Things to Know Before Buying Moss Killer

Moss is a common problem in gardens for a variety of reasons. It can give the lawn an uneven colour and feel spongy to walk on.

Moss often occurs when there is sparse grass cover, on compacted or waterlogged soil, in shady areas, or on soil that is lacking in nutrients or too acidic.

Moss killers are an easy and effective way to rid your lawn of that ugly moss. The moss will die quickly after treatment and can then be raked or scarified out.

So, if you want to start using moss killer, read these helpful tips to help you make an informed purchase:

If allowed to get out of control, moss can overrun your lawn. It often outcompetes grass and will steal valuable water and nutrients away. As a result, moss will spread, killing off your grass.

A lot of moss on the lawn will look patchy and spongy, it won’t give you the smooth, well-groomed lawn that you’re after.

Using a moss killer will stop this spread, and the majority of them will actually fertilise your lawn and help improve its appearance.

Moss requires a moist environment to thrive; unlike most other plants, it doesn’t have roots to transport water and nutrients. The best way to treat moss is to dry it out completely, and this is how a moss killer works. Most moss killers contain iron, which can dry out the plant over time.

The best moss killer products will also improve the health of your lawn. If you have a lot of moss you may need to repeat the application. Most moss killers contain iron sulphate which kills the moss as well as greening up the lawn. At lower concentrations, these products can be used as a lawn tonic.

Both liquid and granular form moss killers are very effective.

One factor that may affect whether you choose one or the other is the type of spreader you have available.

If you already have a granule fertiliser spreader, you may be more comfortable with granular moss killer. Equally, if you normally use a liquid sprayer when fertilising, or have a watering can with a fine-holed rose, it might suit you better to use liquid moss killer.

Pros of Liquid Moss Killer

  • If applied properly, gives very even coverage
  • Easily and quickly absorbed
  • Easy to apply

Cons of Liquid Moss Killer

  • May not last as long in storage as granules
  • Shouldn’t be used before rainy weather

Pros of Granular Moss Killer

  • Can be ‘slow release’ – lasts longer and may be more effective
  • May be cheaper than liquid products

Cons of Granular Moss Killer

  • May burn the grass if not carefully and evenly applied
  • Can be more difficult to apply evenly

All of the moss killers featured in these reviews also advertise themselves as lawn feed. Personally, I think it’s best to buy a moss killer combined with lawn feed because when moss dies off it can leave sparse patches. If the lawn is treated at the same time, it won’t take long for the grass to grow and fill in these areas.

However, if your lawn has been really overrun by moss, you might want to consider buying a specified moss killer. This will be the best way to really tackle a carpet of thick moss.

Everything We Recommend

IMAGERECOMMENDED PRODUCTSPRODUCTFEATURES
  • Best moss killer for lawns
  • Fertilises the lawn
  • Covers 2500 m²
  • Quick-acting formula
  • Improves lawn health
  • Encourages fast re-growth
  • Powerful formula
  • Fertilises the lawn
  • Covers up to 5000 m²
  • Safe to use on stonework
  • Harmless to plants and animals
  • Eliminates moss whilst fertilising lawn
  • Helps lawn resist heat
  • Eliminates moss for good
  • Results within 7 days

More Detailed Moss Killer Reviews

Pro-Kleen Premium Iron Sulphate Lawn Moss Killer

FEATURESRATINGPRICE
FEATURES
  • Best moss killer for lawns
  • Fertilises the lawn
  • Covers 2500 m²
OUR RATING
99

PRICE

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Pro-Kleen Premium Iron Sulphate Lawn Moss Killer Review

This Pro-Kleen Premium Iron Sulphate Lawn Moss Killer delivers very desirable results: feeding your lawn whilst ridding it of moss.

It contains iron sulphate which will both kill moss and fertilise the lawn, ultimately encouraging strong, healthy, dark green grass. It comes in powder form and can be applied dry. Alternatively, you can mix it into water and apply it with a sprayer, or do the same with a watering can with a fine rose.

Undoubtedly for me this product wins top spot for the best moss killer for lawns.

The box provides enough to cover a huge area of 2500 m², plus it comes in a resealable tub, so provides great value for money.

Dosage instructions are clearly explained on the back of the tub. I used 70 g in 7 L of water and this reduced the moss significantly and improved the health of the grass. As you can tell, you don’t need to use much to get good results.

I will repeat the process in a few weeks to get rid of the remaining moss. You can also use this product at half strength as a lawn tonic; this will improve the general health of your lawn. Don’t be tempted to apply more than the recommended amount, though, as this can scorch the grass. A classic case of less is more!

To conclude, this product is simple to use, effective and excellent value for money.

Maxicrop Moss Killer and Lawn Tonic

FEATURESRATINGPRICE
FEATURES
  • Quick-acting formula
  • Improves lawn health
  • Encourages fast re-growth
OUR RATING
94

PRICE

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Maxicrop Moss Killer and Lawn Tonic Review

This Maxicrop Moss Killer and Lawn Tonic contains 17 % iron sulphate, 2 % nitrogen, and a healthy dose of natural seaweed.

But what does this do? Well, the iron sulphate kills the moss, whilst the nitrogen and the seaweed work to invigorate the the grass and improve its health. This is a winning pairing; these components encourage fast regrowth in the bare patches left by the dead moss.

This moss killer is fast acting and effective, as well as clean and easy to use. 310 ml is sufficient to treat 10 m², so this pack should cover 80 m² of lawn. You simply mix the liquid with water and apply with a sprayer or watering can with a fine rose.

This is a slightly more costly option compared to some products on this list; however, it is very effective and blackens almost all moss within days. What’s more, it improves the health and colour of the lawn. I would also add that it is also the best moss killer to use if you plan to reseed the lawn, because its liquid form does not linger for as long as granular products.

Tradefarmni Iron Sulphate Premium Moss Killer

FEATURESRATINGPRICE
FEATURES
  • Powerful formula
  • Fertilises the lawn
  • Covers up to 5000 m²
OUR RATING
93

PRICE

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Tradefarmni Iron Sulphate Premium Moss Killer Review

Up next we have the Tradefarmni Iron Sulphate Premium Moss Killer. Another great option that kills moss and fertilises your lawn.

Each pack provides enough product to treat up to 5000 m² of lawn. That’s a lot of moss killer! It comes in a resealable plastic tub which keeps the product protected and dry, meaning you’ll be able to get full use of those 5000 m²!

This product can be applied wet or dry, but for best results dilute it with water and apply with a sprayer or watering can. It will absorb quickly into the lawn in liquid form, and will reduce possibility of uneven application.

It’s easy to use and effective, killing most moss in less than a week. The pack will also last for ages which is a win economically.

Viano MO Bacter Organic Lawn Fertiliser and Moss Killer

FEATURESRATINGPRICE
FEATURES
  • Safe to use on stonework
  • Harmless to plants and animals
  • Eliminates moss whilst fertilising lawn
OUR RATING
90

PRICE

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Viano MO Bacter Organic Lawn Fertiliser and Moss Killer Review

The MO Bacter Organic Lawn Fertiliser is designed to rid your garden of moss, whilst improving the condition of your soil.

This moss killer and fertiliser combo is highly effective. What’s more, it’s safe to use on all stonework so you won’t need to worry about damaging your patio as you treat it.

Another positive is that it states that it is harmless to both plants and animals, meaning you don’t need to fear any adverse effects and can simply focus on eliminating moss whilst feeding your lawn.

This moss killer comes in a 20 kg bag, which can treat a lawn of up to 200 m² squared. It’s incredibly long lasting, feeding your lawn for up to 100 days. Plus it’s, with no raking necessary, and won’t leave any black mess on your lawn.

Scotts Miracle-Gro EverGreen Lawn Food and Moss Killer

FEATURESRATINGPRICE
FEATURES
  • Helps lawn resist heat
  • Eliminates moss for good
  • Results within 7 days
OUR RATING
87

PRICE

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Scotts Miracle-Gro EverGreen Lawn Food and Moss Killer Review

The Scotts Miracle-Gro Lawn Food is a four-in-one moss killer, lawn fertiliser, weed killer and drought repellent – perfect for improving the quality of any lawn!

This moss killer has a WaterSmart formula; it helps the soil and grass absorb water and nutrients more easily, therefore meaning they resist heat, drought and other stresses. The N+ formula boosts greening power, offering visibly greener lawns within just 7 days. All the while, it works away to rid your lawn of moss for good!

It comes with a built-in spreader for easy application, so one less thing to worry about, and it can be used any time from April to September.

Moss Killer FAQ

Use a high-quality moss killer.

Moss relies on moisture to stay alive, so the best way to eliminate it is to dry it out completely. Many traditional methods such as power washing and bleaching won’t get rid of it for good.

Follow the instructions of your moss killer carefully, and check exactly where your moss killer can be used. If your first application doesn’t successfully eliminate the moss, you may need to treat the area more than once.

Most moss killers will deliver results within anywhere between a few hours and a couple of weeks, depending on the product you use.

Ideal times to apply moss killers are in spring or autumn.

If applying in spring, do this as soon as the weather warms and the grass begins to grow, ideally before the likelihood of sporing in April. If you want to apply the treatment in autumn, wait until the dry weather is over and the conditions are wetter, September is usually about right.

Wait until the moss is dead and black before raking, otherwise, you can spread pieces of live moss and spores over to another area of your lawn.

It’s best to wait a few weeks before applying a second application of moss killer, especially if it contains iron sulphate as an overdose of this can scorch the grass.

It is best to apply these products over the whole lawn as they increase the acidity of the soil and this can affect the colour of the lawn. Part applications could result in a variable colour in your grass and a patchy and uneven effect.

  • Improve drainage and aerate the lawn – if your lawn has a tendency to become waterlogged or compacted this will encourage moss.
  • Always feed your lawn in autumn to help prevent moss taking over in the damp winter months. Regular feeding keeps your grass in tip-top condition making it harder for moss to find a way in.
  • Avoid cutting your grass too short as this can damage it and allow moss to get a foothold.

Iron sulphate is safe to use as long as you follow the guidance on the pack carefully. You should, in general, keep pets and children off the area for 24 hours after use. If you want to use moss killer on patios or paths then test it on a small inconspicuous area as the product can stain. Wear gloves and protect the areas where you mix the product to prevent staining and remember to check your shoes before going indoors as the products can stain floors and carpets.

Sources

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