Lawn Sand – What, Why, When & How to apply

Some lawn enthusiasts simply SWEAR BY lawn sand and will apply a layer of it religiously twice a year. I’m not saying you need to go that far but if your lawn is in the shade or is damp and wet, lawn sand is a must.


Don’t get confused between the different types of lawn sand. Some have chemicals in them and others don’t. If you’re going to apply it to your lawn, you should definitely know the difference.

So, in this post I’m sharing with you the best types of sand products that will give your grass a great needed boost either in Spring, Autumn or both. I’ll explain why you need them. And just as important, when you shouldn’t use each of them or at least need to be cautious.

I’ll also give you some key tips on when and how to apply.

For minimum effort, maximum results!

So, let’s dive in to the types of products you can choose

Lawn Sand as a fertiliser with added Nitrogen and Iron (Moss Killer)

Note: This is NOT to be confused for a top dressing. That’s because it contains chemicals.

So, what is it and why use it?

It’s a sand based chemical fertiliser that will add the nutrients to a lawn with dense soil, while improving drainage. It also contains a small amount of iron, which is designed to suppress moss. It won’t cure a stubborn moss problem but with regular applications, it will suppress moss, That means MUCH less work for you year on year – BOOYA!

The small amount of nitrogen will not replace your seasonal feeds, but it will give the lawn a nice boost of growth and green it up.

The sand itself will help with drainage, especially if you do some hollow-tine aeration beforehand. That’s because the granules will get into the holes and make sure the drainage is there for longer.

When should you use it?

During Spring or Autumn when moss is actively growing

If your grass is in a dense clay soil, damp area with little drainage or a shady part of your garden, lawn sand with nitrogen and Iron will go a long way to helping you keep your lawn looking great.

Mainly because moss LOVES all the above but hates sandy soil and iron, so keep the grass strong and it will outcompete everything else.

Apply once in Spring and once in Autumn at the most. Alternatively apply it once in EITHER Spring our Autumn. Even using it once a year will give you huge benefit.

In my experience it’s best to apply it on a dry day because it will spread a lot easier. Wet granules can get into clumps and cause small bumps.

How should you apply it?

The good thing is you only need a little bit (compared to the ones mentioned below).

Use approximately 70g per m2 of Lawn Sand for optimum results.

That means you can either apply it by spreader or by hand. It also means you can buy it online and don’t need to pay na arm and a leg for shipping – like with most other bulk bags of garden stuff.

70/30 Sand/Soil Top Dressing

Basically, 70/30 means 70% and 30%. A mix of sand and top soil. It’s nothing more than that, it doesn’t contain chemicals and it won’t kill moss. Remember though, moss doesn’t like sandy conditions so it will help to prevent it but it’s not specifically designed to do that.

You can usually buy this mix in either 25KG bags or 500KG to 1,000KG Pallets.

So, why should you use a 70/30 mix

There are so many benefits when applying this as a top dressing. Firstly it will create the much needed drainage your grass desires. Especially if you aerate first. It will also reduce the density of a clay soil as the sand works its way into the main soil bed over the coming weeks.

When used after overseeding it will MASSIVELY improve the seed-to-soil contact. Meaning it will MASSIVELY increase germination rate of your seed.

It’s perfect for use in an area that gets BOGGY. That’s because it helps to absorb the water and allow the grass to thrive.

Finally, you can also use it for patch repair

When should you use it?

After overseeding..

Applying 70/30 will hugely improve seed to soil contact. By improving drainage it will give the seed a much better chance of surviving and thriving in its early growth stage.

Try to keep the mix dry before applying and apply it on a dry day because it will make it loads easier to spread evenly across the lawn.

Or just as a soil conditioner in the Spring & Autumn…

If you’re not overseding, no worries. You can apply this mix any time you want. Most often it’s done during Spring and again during Autumn. It really depends on how much you choose to use. More on that below.

How should you apply it?

There are a number of approaches tried and tested by many for applying a 70/30 top dressing. Some traditional and some quite innovative.

Firstly there’s the traditional broom. Here you would simply drop it down in clumps and then sweep it out as evenly as possible.

Then there’s the professional lawn leveller – these come in a multitude of sizes from small to large and even ones that attach to a tractor.

Finally, there’s the cheap cheerful but brilliantly innovative, attach a piece of string to a pallet and pull it across the lawn. I actually tried this method when I seeded fro scratch to level the soil and it worked extremely well. At that point I didn’t have a lawn leveller.

Just Sand as a Lawn Top Dressing

This is the option chosen by many golf courses. Why? Because it will give you a super flat surface for your lawn to grow on. That’s not the only benefit though

Why should you use just sand as a top dressing?

One of the biggest reasons is to level any low points in the ground and improve drainage on a dense soil base. Over time, the soil will be conditioned meaning your grass will have a better chance of survival.

It’s 100% organic and therefore perfectly safe to apply when there are pets and children around. Not only that, it’s also fairly easy to spreaad and does a great job of working its way through a thick lawn into the soil.

Although it won’t contain added iron, it will indirectly help you avoid moss from creeping in. That’s because moss hates sandy soils.

Don’t get confused though, when it comes to sand, there are loads on the market for loads of uses. From building to sharp or even children’s play sand.

So, that begs the question…

What type of ‘just sand’ should you apply on your lawn?

In general, most products available will do the job. However what you don’t want to do is infect the soil with any disease.

Therefore, it’s important to buy a ‘washed’ sand.

The most common type is known as silica sand. It’s also known as Silver Sand. Either way, it’s free of chemicals and should also say ‘suitable as a top dressing’ on any product you choose to buy.

When should you use ‘Just Sand’

I’ll be honest, if you’re looking to use just sand, you should only really use it to level any uneven patches. If you want to do a full top dress, then use a sand/soil mix. Or even a peat free compost.

How to apply ‘silica sand’ to your lawn

Simply apply by hand (or bucket) and then sweep it across the ground. Aim to fill any low points with the sand to level it out if it’s bumpy. Alternatively, you could use a top dressing roller, which will give you a nice even spread right across the area,

However you apply, the main aim to avoid having any unsightly blobs of sand when you’ve finished.

Finally, what problems can occur with using sand on your lawn

Remember that sand itself doesn’t improve the nutritional value of the soil, so even if you do apply it, you still need to use our professional grade fertilisers in the form of a full year’s care programme.

What’s more, if too much is applied it can stop the grass from getting the nutrients it needs to be able to thrive in the competitive world of weeds and moss.

As such and as it is an abrasive substance, you could experience problems if you don’t apply it evenly.

SOme people swear by using lawn sand twice a year. Others say it can harm your grass if care isn’t taken at every turn.

Ultimately, the best thing to do is ‘go easy’. Never apply too much in one go and choose a specially formulated lawn sand with moss killer for moss prevention and drainage or a soil mix instead of ‘just sand’ where possible where you need a top dressing.

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