Aeration isn't something that must be completed on a fixed calendar date. Instead, it should be carried out whenever the lawn begins showing signs of compaction.

That being said the best times to carry out routine aerate tend to be spring and autumn, when the grass is actively growing and can recover quickly from the process. Lawns with heavy wear, children or pets may benefit from annual aeration. Ornamental lawns with lighter use may only require aeration every few years.

Before you begin, check the weather and soil conditions. Ideally, the soil should be:

• Moist but not waterlogged
• Soft enough for the tines to penetrate easily
• Free from frost
• Not baked hard after prolonged dry weather

Avoid aerating during periods of drought, as dry soil can be difficult to penetrate and may damage your equipment. Equally, avoid working on saturated ground, as wet soil can smear around the holes rather than relieving compaction.

Give the lawn a mow one or two days before aerating, reducing it to its normal mowing height. Shorter grass makes it easier to see where you've worked and allows the aerator to reach the soil more effectively.

Before you start:

• Remove any leaves, sticks or garden debris.
• Mark the location of sprinkler heads, irrigation systems or shallow utility lines if you have them.
• If the lawn is particularly dry, water it lightly the day before to soften the soil.

Preparing the lawn properly makes aeration easier and produces better results.

The best tool depends on the size of your lawn and the level of compaction.

Garden Fork

A standard garden fork is ideal for smaller lawns or compacted patches.

It's inexpensive, readily available and can be surprisingly effective when used correctly.

Hollow Tine Aerator

A hollow tine aerator removes small plugs of soil, making it the most effective option for relieving compaction.

It's particularly useful on:

• Clay soils
• Waterlogged lawns
• Heavily used family lawns
• Lawns with poor drainage

Solid Tine Aerator

Solid tine aerators create holes without removing soil.

They're ideal for routine maintenance and improving airflow but are less effective on severely compacted ground.

Mechanical Lawn Aerator

For larger gardens, a powered aerator can save significant time while producing consistent results across the whole lawn.

Many garden centres and hire shops offer these machines for short-term hire.

Start in one corner and work in straight, overlapping lines, much like mowing the lawn.

This helps ensure every area receives even treatment and avoids leaving untreated strips.

Aim to create holes approximately:

• 10–15cm (4–6 inches) apart
• 7.5–25cm (3–10 inches) deep, depending on the equipment you're using and the severity of compaction

Areas that receive the most foot traffic, such as around patios, washing lines or children's play areas, may benefit from a second pass.

If you're using a garden fork, simply pushing it into the ground isn't enough to fully relieve compaction.

Insert the fork as deeply as possible before gently rocking the handle backwards and forwards. This slight lifting action opens up the soil profile, creating larger air spaces and breaking apart compacted layers beneath the surface. Repeat this every 10–15cm across the lawn.

Although more time-consuming than mechanical aeration, this method can be extremely effective on smaller lawns.

If you've used a hollow tine aerator, you'll notice small plugs of soil left on the lawn.

These can either be:

• Left to dry naturally before being brushed back into the lawn.
• Collected and added to your compost heap.

Leaving the cores for a few days allows them to break down naturally and return fine soil particles to the surface.

Aeration creates the perfect opportunity to apply a top dressing. The holes allow the dressing to work deeper into the soil profile, helping improve soil structure over time.

Depending on your soil, choose:

• A sandy top dressing for heavy clay soils to improve drainage.
• A loam-based dressing for general lawn improvement.
• A compost-rich dressing if you're looking to improve organic matter in poor soils.

Brush the dressing across the lawn so it falls into the aeration holes.

If your lawn has bare patches or thin grass, overseeding immediately after aeration is one of the best ways to improve establishment. The holes provide excellent seed-to-soil contact, helping seeds germinate more successfully while protecting them from birds and drying out.

Choose a grass seed mixture suited to your lawn, whether that's a hard-wearing family lawn, fine ornamental lawn or a mixture designed for shady areas.

Once aerated, the lawn is in an ideal position to make use of fertiliser: Read our complete fertiliser guide.

If conditions are dry, give the lawn a thorough watering after completing the work.

Over the following few weeks:

• Continue mowing as normal once growth resumes.
• Avoid excessive foot traffic if you've overseeded.
• Keep the soil moist to encourage root development and seed germination.

Within a few weeks, you should notice healthier growth, improved colour and a lawn that drains more effectively.