How to sow grass seed

Inspired by a helpful YouTube guide. We based this walk-through on the popular UK video "How to Sow Grass Seed – Great Lawns Made Simple" from The Grass People, a Yorkshire-based lawn seed company whose "Great Lawns Made Simple" series covers every stage of the process in plain, sensible terms. Well worth watching before you open the bag.

1. Pick the right time of year

In the UK, mid-spring (April to mid-May) and early autumn (late August to September) are your windows. The soil needs to be consistently above 8°C, and you want warm days with some moisture rather than baking heat.

Avoid sowing in summer if you can help it. The seed will germinate but the seedlings can bake off before they establish. Autumn is arguably the better bet — soil is warm from summer, rain is more reliable, and the competition from weeds is lower.

2. Clear the area properly

Remove any existing weeds, stones, and debris. If you are overseeding a patchy lawn, mow it short first and scarify or rake out dead thatch.

For a completely bare area, dig over any compacted ground. Breaking up the top 10–15 cm makes a real difference to how the roots establish.

3. Prepare a fine seedbed

Rake the surface back and forth until you have a fine, crumbly tilth — roughly the texture of breadcrumbs. Get rid of any clods or large stones.

Then firm the area by walking across it with your weight on your heels, or using a lawn roller if you have one. The idea is a surface that is firm but not compacted, with no air pockets under the top layer.

4. Choose the right seed mix

Not all grass seed is the same. A shaded garden needs a shade-tolerant mix. A lawn that gets heavy footfall needs a hard-wearing mix. Read the bag. Using the wrong seed for your conditions is one of the most common reasons a new lawn fails to thrive.

For most Kent gardens — a reasonable amount of sun, typical clay-loam soil — a standard back lawn or utility mix does fine.

5. Sow at the right rate

The seed bag will give you a sowing rate, typically around 35 g per square metre for new lawns. Measure your area properly before you start so you know how much you need. More is not always better — overcrowding the seed leads to weak, leggy seedlings.

For small patches, scatter by hand in two passes at right angles to each other to get even coverage. For larger areas, a rotary spreader or drop spreader saves a lot of effort.

6. Rake in lightly

After sowing, give the surface a light raking to work the seed into the top few millimetres of soil. You are not trying to bury it deeply — grass seed germinates close to the surface where it gets light.

A thin covering of topsoil or compost over the seed is optional but helps retain moisture and protects from birds.

7. Water carefully and keep off the grass

Water gently but thoroughly after sowing, and keep the seedbed moist until the grass is well established. A fine rose on a watering can is kinder than a hose at pressure. In dry spells you may need to water daily.

Do not walk on the newly sown area. Put up a small barrier if you need to. Footprints in a fresh seedbed create dips that fill with water and kill the seedlings.

8. The first cut

Wait until the new grass is about 5 cm tall, then cut it on a high setting. Take no more than a third off the blade length at a time. The first few cuts are gentle ones — the roots are still shallow and a heavy cut or heavy mower can pull seedlings out entirely.

By all means mow regularly once it looks established, but hold off on any lawn feed or weed treatment until at least the third cut.

When to call a handyman

Sowing grass seed is genuinely a DIY job. That said, if the area is large, the ground is very compacted, or you need turf-laying rather than seed, Richard can help with the prep and the finishing. Sometimes it is just easier to have someone else do the hard digging.