Lawn Care & Maintenance

A well-maintained lawn is one of those things that only looks effortless when it is done right. The UK climate, mild, damp winters and occasionally hot, dry summers, creates its own rhythm of lawn care, and understanding that rhythm is 80% of the job. The other 20% is having the right kit and not cutting corners in autumn when the grass looks dormant but is actually recovering.

Most problems with UK lawns, patchy growth, moss, thatch build-up, compaction, stem from doing the wrong thing at the wrong time of year rather than from neglect alone. This guide sets out what to do and when, with realistic costs for both DIY and professional approaches.

The UK Lawn Calendar

Turf is best laid in mid-autumn, but it can go down at any time from mid-autumn to early spring while the soil is not too wet or frosty.¹

Mowing

The single most important factor in lawn health is cutting height and frequency. Never remove more than one-third of the grass blade in a single cut.² Cutting too short stresses the grass, opens it to moss and weed invasion, and causes yellowing in dry spells.

Target heights by season:

• Spring/autumn: 30–40 mm
• Summer: 40–50 mm (or higher in drought)
• First and last cuts of year: 50–60 mm

These heights sit at the longer end, which suits a hard-wearing family lawn; the RHS gives a general rule of 13–25 mm in summer and up to 40 mm in spring and autumn for an ordinary domestic lawn, and warns that very close mowing encourages shallow rooting, drought damage, weeds and moss.²

A rotary mower suits most UK family lawns.² A cylinder mower gives a finer finish but requires a flat, well-prepared lawn. Robot mowers (£300–£2,500) work well on flat, clearly defined plots with no trees or garden beds creating complex navigation obstacles.

Feeding

Spring/summer fertiliser (high nitrogen, N:P:K around 20:10:10) goes on in mid-spring, usually late March to April, with a second dose a couple of months later only if the lawn still looks poor, and never after August.³ Nitrogen drives leaf growth and colour. Apply at the rate on the packet, which for a granular feed is usually about a handful per square metre.⁴ Do not apply in drought, as it can scorch grass if not watered in.

Autumn fertiliser (low nitrogen, high potassium, around 3:6:12) goes on in September. An autumn feed encourages root growth through winter rather than soft leafy growth.⁴ It is worth applying to a thin or tired lawn, though many lawns recover from summer wear without any feed.

Approximate feeding costs (for an average 50 m² lawn):

• Granular fertiliser (spring or autumn, 50 m²): £8–£15 per application
• Liquid lawn food: £6–£12 per application

Scarifying and Aerating

Scarifying removes the layer of thatch, dead grass, moss and organic debris, that builds up between the soil surface and the living grass. A thick thatch layer stops water getting down into the soil and reduces air circulation, which can lead to fungal problems; as a rule of thumb, if you cannot see the soil between the blades of grass, the lawn will benefit from scarifying.⁴ Scarify once in September using a spring-tine scarifier (manual: £30–£60, electric: £60–£150, hire: £30–£50/day). The lawn will look alarming immediately afterwards, bare and brown. This is normal; it will usually recover within a few weeks.

Aeration relieves compaction, a common cause of waterlogging and poor drainage. Drive a garden fork in as deep as the tines will go, with the holes 100–150 mm apart, or hire a hollow-tine aerator (£40–£60/day), which pulls plugs of soil to the surface and works better on clay or waterlogged ground.⁴ Do this in September after scarifying, then brush a top dressing of sandy loam, sharp sand and compost into the holes; for most lawns, aerating every two to three years is enough.⁴

Reseeding and Overseeding

Bare patches are best repaired in mid-spring or early autumn, when the soil is warm and moist.⁵ Steps:

1. Scarify or scratch the bare area with a rake
2. Apply a thin layer of top-dressing compost (10 mm)
3. Broadcast seed at the rate on the packet, usually around 30–35 g/m² (use a mix appropriate to your lawn’s shade and use)
4. Rake in lightly, water and keep moist for 14–21 days
5. First cut when seedlings reach 50 mm, set the blade high

Grass seed costs £5–£15 per kg; a 1 kg bag covers roughly 30–33 m².⁶

Moss and Weeds

Moss is a symptom, not the problem. It grows where the grass is weak: compacted soil, poor drainage, shade, low pH or over-cutting. Apply iron sulphate (lawn sand or moss killer) to kill the moss, then address the underlying cause, otherwise it will return within a season.

Broadleaf weeds (dandelion, clover, plantain) can be spot-treated with selective lawn herbicide containing MCPA or mecoprop-P. Do not apply in drought or frost, and keep children and pets off the lawn for as long as the product label says. Weed-and-feed products combine fertiliser with herbicide and are convenient but tend to be less effective than separate applications.

Professional Lawn Care

Lawn care companies such as Greensleeves, GreenThumb and independent local operators offer treatment programmes that typically include four to six visits per year covering fertilisation, weed control, moss treatment and disease management.

Professional programmes make most sense for larger gardens (over 100 m²), lawns where presentation really matters (front gardens of rental properties or commercial premises), or owners who genuinely do not have the time or inclination to follow the seasonal schedule themselves.

Common Mistakes

• Cutting too short. The most common cause of moss, weeds and a yellow lawn in summer.
• Ignoring autumn care. Skipping the September feed, scarify and aerate means the lawn enters winter weakened and takes longer to recover in spring.
• Watering lightly and frequently. Encourages shallow roots. Established lawns usually recover from summer browning once rain returns, so watering is optional; if you do water, water deeply and infrequently to push roots down.³
• Mowing wet grass. Damages the turf, compacts the soil and clogs the mower.² Wait until the dew has lifted.
• Applying spring fertiliser in late summer. Forces soft leafy growth just before the first frost, which then dies back badly and can invite fungal disease.³

A good lawn is the product of consistent, seasonal attention over several years. The investment is modest, £50–£150/year in materials, and the results are cumulative.