If your lawn struggles with moss, looks patchy or feels spongy underfoot, the problem might be a layer you can’t easily see – thatch.

What Is Lawn Thatch?

Thatch is a layer of dead grass, moss, and organic debris that builds up just above the soil. A thin layer is normal, but too much stops water, air, and nutrients from reaching the roots, weakening your lawn and giving moss the perfect conditions to thrive.

How Moss Takes Hold

Moss tends to develop in lawns that are:

• Poorly drained or compacted

• Shaded or overwatered

• Covered with thick thatch

Iron sulphate (sulphate of iron) is often used to kill moss, but it lowers the soil pH – which actually encourages moss to return unless underlying issues are resolved.

Why Scarifying Matters

Scarifying removes thatch, allowing the soil to breathe and the grass to grow stronger. It looks harsh at first, but it's one of the best ways to revitalise your lawn.

• Best done in spring or autumn

• Use a scarifier or spring tine rake

• Combine with overseeding for better recovery

Regular Mowing Is Key

Mowing frequently – especially when the lawn is dry – helps prevent thatch buildup by keeping clippings small and reducing stress on the grass.

Can a Robot Mower Help?

Yes. Robot mowers cut little and often, returning fine clippings that decompose quickly – preventing thatch from forming.

Our Genie Robot Lawn Mowers are a brilliant option for hands-free lawn care. They maintain ideal grass height and improve lawn health over time – all while freeing up your weekends.

Other Lawn Maintenance to Consider:

• Aerate compacted soil to improve drainage

• Overseed after scarifying or aerating

• Feed with balanced lawn fertiliser in spring/autumn

• Check soil pH, and use lime if it’s too acidic from moss treatments

In Summary
Scarifying is one of the best things you can do for your lawn – especially when combined with regular mowing, aeration, and feeding. And if you want to take your lawn care to the next level, a robot mower can quietly and consistently do the hard work for you.