How to aerate a lawn

Inspired by expert UK lawn care advice. This guide draws on the well-regarded "How to Aerate, Spike & Hollow Tine a Lawn" from Lawnsmith, a UK lawn care specialist based at lawnsmith.co.uk. Their explanation of the difference between spiking and hollow tining is particularly useful for knowing which method suits your lawn.

1. Know why your lawn needs aeration

Soil compacts over time from foot traffic, mowing, and rainfall. When compaction sets in, the soil pores close up — roots struggle, drainage fails, and moss creeps in to take advantage. Lawns that sit on heavy clay, like many in Kent, are especially prone to it.

Signs your lawn needs aerating: water sits on the surface instead of soaking in, the grass looks dull even after feeding, or you can feel the turf is noticeably hard underfoot. Any of those? Time for aeration.

2. Choose the right time of year

Autumn is the best time for most UK lawns — the soil is still warm, the grass has a long growing season ahead to recover, and rainfall helps the process along. Spring works too if you missed the autumn window, but avoid midsummer when the lawn is under stress from heat.

Do not aerate a bone-dry lawn. The tools will not penetrate properly and you will just be pushing hard soil around. After a day or two of rain, or early in the morning when there is a bit of moisture in the ground, is the right moment.

3. Mow the lawn short before you start

Cut the grass a little shorter than usual — around 25 to 30 mm — so the aerating tool makes proper contact with the soil surface. Overly long grass gets in the way and you end up with uneven results.

Remove any clippings, leaves, and debris. Starting on a clean surface makes the whole job easier and means any top dressing you apply afterwards goes where it should.

4. Spiking: simple and effective for light compaction

A spiking fork or solid-tine aerator pushes holes into the soil without removing material. It relieves compaction, improves drainage, and is perfectly adequate for most garden lawns that get moderate use. Aeration shoes — soles fitted with metal spikes — are a budget option that works surprisingly well on smaller patches.

Work systematically across the lawn in overlapping rows, spacing holes roughly 100 mm apart. Push the tines in to their full depth with each step. Methodical is better than fast here.

5. Hollow tining: the thorough option for heavier compaction

Hollow tining removes small cores of soil from the lawn rather than just pushing holes. That core of compacted material comes out, leaving a void that fills in with better soil over time. The results are more dramatic than spiking, but the process is more effort.

Hollow tine aerators can be hired from most local tool hire shops for around £40–60 a day. For a large, heavily compacted lawn, it is worth every penny. Leave the cores on the surface to dry briefly, then break them up with a stiff brush and work them back into the holes as a natural top dressing.

6. Brush in a top dressing

After aerating, brush a top dressing of fine sharp sand and loam into the holes. This helps them stay open and improves the soil structure gradually from the bottom up. A mixture of roughly 70 per cent sharp sand and 30 per cent topsoil works well for most lawn types.

Use a stiff garden broom or a drag mat to work it in thoroughly. Do not leave piles sitting on the surface — they will smother the grass if they sit too long. The idea is to fill the holes, not coat the lawn.

7. Overseed bare or thin patches while you are at it

The open soil after aeration is ideal for overseeding. Scatter grass seed across the whole area or just the thin patches, then lightly rake it in. The aeration holes give the seed direct contact with soil and a much better germination rate than scattering seed on an unworked surface.

Choose a seed mix suited to your conditions: shaded areas need a shade-tolerant blend, heavy-use areas benefit from a tough ryegrass mix. Keep the seed moist for the first few weeks until it has taken hold.

8. Feed and water after the job

Apply an autumn lawn feed after aerating — something higher in potassium than nitrogen at this time of year, which encourages root development rather than leafy growth. Follow the packet rates. Overfeeding in autumn can push soft growth that is vulnerable to the first frosts.

Water if the weather is dry, but a good autumn aeration should line up with the wetter months anyway. Give the lawn a couple of weeks before mowing again, and keep foot traffic light while the seed germinates.

When to call a handyman

Call Richard if the lawn is too large to tackle yourself, if you want the whole job done in a single session, or if you are combining aeration with scarifying and overseeding and need it coordinated. Regular lawn care is also something that can be folded into a maintenance visit for properties that need keeping on top of year-round.