Read the Lawn Before You Reach for the Rake

Spring arrives slowly in the UK, and lawns wake up at different times depending on where you garden. A sheltered plot in Cornwall may be pushing new growth in early March, while a windy garden in Yorkshire can sit dormant well into April. Rather than working to the calendar, work to the grass. The signal you are waiting for is visible growth: fresh green blades at the base of the sward and soil that has warmed to roughly 8°C to 10°C at root level.

Walk across the lawn first and take note of what you see. Is there a spongy feel underfoot? Do patches flatten and stay flat? Are there areas where water sits after rain? These clues tell you which jobs matter most this year, because no two lawns need exactly the same treatment. Once growth is genuinely underway, you can begin the spring sequence: clear the surface, open the soil, then feed.

Scarify to Remove Thatch and Moss

Thatch is the layer of dead stems, runners and roots that builds up between the grass and the soil. A thin layer is useful, but once it exceeds about 1cm it forms a mat that blocks water, air and nutrients, and it gives moss a perfect place to establish. Spring is the ideal time to deal with it, as the grass can recover quickly.

Set the scarifier blades or rake tines so they scratch the surface rather than ripping into the soil. Work in two directions, at right angles to each other, and go over the worst areas a second time. If you are using a spring-tined rake, short firm strokes will pull out far more than long sweeping ones.

• Timing: wait until growth is strong enough to fill the gaps, usually mid-March to mid-April in most of the UK.
• Depth: aim to remove the brown, fibrous material and the moss without scalping the crowns.
• Aftercare: collect the debris for the compost heap, then brush the surface so the remaining grass stands upright.
• Moss: treat moss as a symptom, not the problem. Shade, poor drainage and compaction all encourage it, so fix those and it will return far less readily.

Do not scarify a lawn that has just been seeded, or one that is already thin and weak. If the grass is struggling, aerate and feed first and scarify lightly in early autumn instead.

Aerate Compacted Patches

Compaction is the quiet thief of lawn health. Areas near a back door, along a path or where children play regularly become compressed, and roots cannot push through. You will notice thin, tired grass and puddles that linger long after rain has stopped.

For small gardens, a hollow-tine fork or a spiking tool pushed in to about 10cm and wiggled gently is perfectly adequate. Work across the area at roughly 15cm intervals, then repeat at a different angle. For larger lawns, a hollow-tine aerator removes small plugs of soil and is far less effort.

Where you have removed plugs, brush a sandy loam top dressing into the holes. This improves the structure of the soil below rather than simply covering the surface. Choose a dry, settled day when the ground is moist but not waterlogged, and avoid aerating during a frost.

Apply a Balanced Feed as Growth Accelerates

Feeding is where many lawns go wrong. A heavy, high-nitrogen feed applied too early forces soft, sappy growth that is vulnerable to cold snaps, disease and drought. A balanced spring feed gives the grass what it needs without pushing it too hard.

Look for a feed with a roughly even ratio, or one with slightly more nitrogen than potash, and apply it once you have mown the lawn two or three times. Even application matters more than the brand. Use a spreader if you have one, split the dose in half and go over the lawn in two directions.

• Conditions: apply to dry foliage on a day when rain is forecast, or water it in lightly afterwards.
• Avoid: frost, drought and the hottest part of the day.
• Rate: follow the packet exactly. Over-feeding scorches and creates more work, not less.
• Patches: give thin areas a light extra pass rather than doubling the whole lawn.

Overseed Bare Patches While the Soil Is Warm

Spring is a good window for repairing worn areas, particularly in the south where the soil warms early. Fork the patch to relieve compaction, scatter a matching seed mix at the rate on the packet, and cover lightly with sieved compost or top dressing. Keep it moist for the first few weeks. If your lawn is mostly fine fescue, use the same species so the repair blends in.

Bear in mind that any weed-and-feed product will prevent new seed from germinating, so keep the two jobs at least six weeks apart.

Mowing, Watering and the Weeks Ahead

As growth picks up, start mowing regularly and lower the cutting height gradually. Never remove more than a third of the blade in one cut, as this stresses the grass. Aim for around 25mm to 40mm for a general family lawn, keeping the mower blade sharp so cuts are clean rather than torn.

Water deeply but infrequently, and in the morning where possible, so roots are encouraged downwards. A lawn that has been scarified, aerated and fed sensibly in spring will thicken up, resist moss and cope with summer far better than one that was simply cut short and left to get on with it.