✂️ How Short Should You Cut Grass?

Knowing how short you should cut grass is essential for keeping your lawn healthy, thick, and weed-resistant. Cutting grass too short weakens roots and invites problems, while letting it grow too long can lead to poor airflow and patchy growth.

This guide explains the ideal grass cutting heights, how they change through the year, and what to avoid.

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📏 Ideal Grass Cutting Height

For most UK lawns, the recommended cutting height is:

• 4–5cm (1.5–2 inches) for general use
• Slightly longer for shaded or high-traffic areas

This height balances appearance with plant health, helping grass outcompete weeds and tolerate stress.

🌱 Seasonal Grass Cutting Heights

Spring

• Cut to 4–5cm
• Encourages thickening without stressing young growth
• Avoid cutting too low early in the season

Summer

• Raise height to 5–6cm
• Protects soil from heat and drought
• Reduces water loss and scorch

Autumn

• Gradually lower to 4–5cm
• Prevents grass flopping over in wet weather
• Avoid very short cuts before winter

Winter

• Avoid mowing unless grass continues growing
• Never cut frozen or waterlogged grass

🌿 Grass Height for New Lawns

• Seeded lawns: First cut at 7–8cm, then reduce gradually
• New turf: First cut after rooting, using the highest setting

New lawns should never be cut short in their first few months.

❌ Why Cutting Grass Too Short Is a Problem

Cutting grass too short (scalping) causes:

• Weak root systems
• Increased weed and moss invasion
• Greater drought stress
• Higher disease risk

Short grass may look neat briefly but struggles long term.

📐 The One-Third Rule

Never remove more than one-third of the grass height in a single mow.

Example:

• Grass at 6cm → cut down to no lower than 4cm

This rule prevents shock and keeps growth steady.

✂️ Mower Settings Matter

• Use sharp blades for clean cuts
• Adjust cutting height rather than mowing more often
• Mulching mowers work best at slightly higher settings

Blunt blades tear grass, leaving brown tips and disease entry points.

🌟 Final Thoughts

So, how short should you cut grass? For most lawns, keeping grass between 4–6cm, adjusting for season and conditions, delivers the best results. Avoid scalping, follow the one-third rule, and your lawn will stay thicker, greener, and healthier all year.