Mowing the Lawn in Spring: This Mistake Weakens It

Many people start using the lawnmower far too early in spring – and in doing so weaken precisely what they are trying to strengthen.

Winter has ended, the sun is returning and you are eager to get outside: finally back into the garden, finally mowing the lawn again. However, reaching for the mower without thinking can seriously harm your grass. One very common mistake can leave the lawn thin, yellowish and vulnerable throughout the entire season.

Why the first lawn cut in spring matters so much

During the cold months, the lawn enters a kind of energy-saving mode. Growth almost completely stops, while the blades store energy to keep the roots going through winter. At this stage, the plant relies mainly on its reserves.

As soon as the first warmer days arrive, the lawn begins growing again. Yet it still needs some of its older blades. They provide energy until the roots are fully active again and new shoots can develop. Cutting too early or too short at this point removes exactly this vital support from the grass.

“Mowing the lawn too early and too short in spring weakens the roots – and the consequences last all summer.”

There is another factor: while the ground remains cold or wet, many soil processes operate only slowly. Micro-organisms are sluggish, root growth is limited and nutrients are less readily available. The lawn is therefore far more sensitive than it is in high summer.

The most common mistake: mowing too early and too low

Many amateur gardeners rely on instinct: “It looks long – so run the mower over it.” That is precisely what causes the trouble. Two issues often occur at the same time.

Problem 1: The soil is still too cold or too wet

Mowing on ground that is still soft or partly frozen damages the soil beneath the lawn. The mower wheels compact it, effectively flattening the turf.

The result can be:

• compacted ground that absorbs water less effectively
• bent and crushed grass blades
• yellow, patchy areas across the lawn
• bare gaps where moss and weeds can easily take hold

In compacted patches, hardly any air reaches the roots. The grass struggles, whereas moss thrives in exactly these conditions. Scarifying later on then merely attempts to remedy damage that could have been avoided in spring.

Problem 2: The cutting height is set too low

The second classic error is setting the cutting height as you would in high summer, when the lawn is dense and strong. In spring, that approach is far too severe.

A rule of thumb from professional lawn care is to remove only around one third of the current height with each cut. If the lawn is about 9 centimetres tall, reduce it to roughly 6 centimetres – not 3 centimetres.

“The ideal spring height is at least 5 to 7 centimetres. Cutting it shorter may look ‘tidy’ for the moment, but makes the lawn more susceptible in the long term.”

This height is so important because:

• Longer blades lightly shade the soil and help prevent it from drying out.
• They encourage roots to grow deeper rather than staying shallow at the surface.
• Weed seeds receive less light and germinate less successfully.
• The plant retains enough leaf area to produce energy.

Wait for the right signs: when the first lawn cut is genuinely worthwhile

Rather than following a fixed date, look for clear signs in the garden. The calendar can be misleading, particularly after mild or exceptionally cold winters.

These indications show that the lawn is ready:

• Daytime temperatures remain consistently above around 10°C.
• No overnight frost is forecast for the days ahead.
• The ground feels neither frozen nor muddy.
• The lawn looks clearly green again rather than grey-brown.
• The blades have reached a height of around 8 to 10 centimetres.

Using these points as a guide will usually help you find a suitable window, often in March or April depending on the region and altitude.

How to set up the lawnmower correctly in spring

For the first cut of the year, set the mower to its highest or one of its upper cutting positions if possible. The aim is to begin gently, rather than immediately cutting the lawn almost down to the ground.

Key points when setting up the mower:

Setting	Recommendation for the first spring cut
Cutting height	Set it so that 5–7 cm of grass blade remains
Mowing frequency	Mow more often and moderately rather than rarely and extremely short
Blades	Sharpen the blades or have them checked
Grass box	Usually collect the clippings during the first cut

Sharp blades are particularly important. Blunt blades tear grass rather than cutting it cleanly. The tips become frayed, turn brown and create entry points for disease. The lawn can then quickly look unhealthy, even though the problem is simply the equipment.

Preparing for the first cut: small checks, major benefits

Before starting the mower, it is worth taking a short walk across the lawn. This helps prevent hidden problems.

• Clear branches, stones and toys from the grass.
• Mark heavily moss-covered or bare spots so they can be dealt with specifically later.
• Test the ground underfoot for a spongy feel – if it feels soft, wait longer.
• Use a rake to roughly level any molehills or uneven areas.

This inspection takes only a few minutes, but it can prevent damaged blades and uneven cutting results.

What follows the first cut: lawn care for a dense green carpet

Once the first hurdle is cleared, ongoing care determines whether the lawn develops into a thick, resilient surface or starts forming gaps. Several measures are particularly helpful:

• Later in spring, lightly scarify areas with heavy thatch.
• Treat bare patches with a suitable overseeding mix.
• Apply fertiliser moderately if needed, once the lawn is visibly growing.
• Water during extended dry spells – infrequently and deeply is better than a brief daily watering.

“Anyone who is patient in spring and does not ‘shave’ the lawn will usually need less repair work in summer.”

Common questions from amateur gardeners – with clear answers

Is it acceptable not to mow the lawn at all in spring?

In very cold, late springs, this can make sense. If the blades barely grow despite sunny weather, mowing achieves little. Once the grass genuinely starts shooting up, however, it should at least be cut moderately. Otherwise, problems may arise later as the lawn collapses, flattens and becomes difficult to mow neatly.

What should you do if the lawn has already been cut too short?

What is done is done, but you can take corrective action. Leave the lawn alone for the next few weeks, avoid walking or driving over it unnecessarily, and mow only very carefully afterwards with the cutting height set much higher. During dry periods, targeted watering can help the roots recover.

Why a longer lawn is often healthier than the “golf-lawn look”

Many people like the appearance of immaculate, very closely cut grass. From the plant’s perspective, though, a moderately longer lawn is often more robust. More leaf surface means more photosynthesis and therefore more energy. Longer blades also buffer temperature peaks and protect the ground from direct sunlight.

This compromise is particularly worthwhile during periods of hot, dry summers: leave the grass 2 centimetres higher and reduce the stress placed on the lawn. Considering this approach from the year’s very first cut lays the foundation for a far more resilient lawn.

Taking a considered approach to spring saves considerable work later. The real “secret weapon” for a strong lawn is therefore neither specialist fertiliser nor expensive equipment, but avoiding one mistake: do not mow too early and do not cut too short.