DIY GUIDE · GARDEN & OUTDOOR · CHECKED OCTOBER 2026
How to feed and treat a lawn yourself
A morning per treatment. £46–£97 for the products and kit for a typical lawn.
Read the lawn first, use amateur products to the label, spread evenly, store and dispose of them properly.
- Every step, start to finish
- Checked October 2026 — sources at the end
- Honest about when to call a pro
FIRST, THE HONEST ANSWER
Do it yourself, or get a gardener?
Do it yourself if…
- The products you will use are sold for amateur, home-garden use and you will follow their labels
- The lawn is established, at least several months old, and growing
- You can keep children and pets off the treated area for as long as the label says
- The problem is ordinary: hungry grass, moss, a scatter of broadleaf weeds
Get a pro if…
- The weed, moss or pest problem needs a professional product, which only a certified user may apply
- The lawn keeps failing in the same places, which usually points to drainage, compaction or disease
- You are dealing with chafer grubs or leatherjackets on a large scale
- The lawn is big enough that hand spreading would take all day
Safety first
- HSE is clear that whoever uses a garden pesticide is legally responsible for using it correctly: read the label before you buy and again before you use it, and follow it exactly.
- Never make up more diluted product than you will use that day, and never add extra to make it stronger; HSE warns that too much lawn weedkiller can damage or kill the lawn.
- Keep children and pets off the treated area for the time the label gives, and wash your hands as soon as the job is finished, before eating, smoking or touching your face.
- Store products in their original containers, tightly closed, out of reach of children and pets, and never decant them into drink bottles.
- Never pour leftover product or rinse water down a drain, sink or toilet; it contaminates water and HSE says you could face prosecution.
- Wear the gloves the label calls for, and do not spray on a windy day, when drift carries product onto beds, ponds and next door.
Stop here: Professional pesticides and lawn treatments
Under the 2012 Plant Protection Products (Sustainable Use) Regulations, which apply in England, Wales, Scotland and Northern Ireland, anyone using a pesticide authorised for professional use must hold a specified certificate or work under the direct supervision of someone who does, for training. HSE's position is that an untrained home gardener must not use a professional product at all. A householder uses only products authorised for amateur use, exactly as their labels say. How to hire a lawn care specialist →
| MATERIAL | COVERAGE | FOR THIS JOB |
|---|---|---|
| Seasonal lawn feed | Coverage printed on the box, by area | Enough for your lawn's area at the label rate |
| Moss treatment | Iron sulphate based, by area | Only where there is moss |
| Ready-to-use lawn weedkiller | Trigger spray for spot treatment | One bottle treats a lot of individual weeds |
| Grass seed | Matched to your lawn type | For bare patches after raking out moss |
How much product for your lawn
Lawn area is length × width for each rectangle, added together. Amount is area × the label rate. A 10 × 8 m lawn is 80 m². If the label rate is 35 g per m², that is 2.8 kg, so an 80 m² box does it once, and a 150 m² box does it with some to spare.
The rate is on the label and differs between products and between feed and moss or weed treatments; always use the label's own figure, not this example's.
Pale, thin grass that grows slowly usually wants feeding. A spring or summer feed is high in nitrogen for leaf growth; an autumn feed is low in nitrogen and high in potassium to toughen the grass for winter. Never use a crop or general fertiliser on a lawn.
Moss thrives in shade, damp, compaction and a lawn cut too short. A moss treatment containing iron sulphate blackens and kills it, but it comes back unless you rake it out and fix the cause.
Three-in-one granules treat the lot in one pass and are convenient on a lawn with a bit of everything. They are strong: use exactly the label rate, on an established lawn, and expect the moss to blacken before you rake it.
For a scatter of dandelions or plantains, a ready-to-use lawn weedkiller sprayed on each weed, or digging them out with a knife, is better than treating the whole lawn. HSE's own advice is to ask whether a couple of daisies really need the whole lawn treated.
Products on sale to the public for home-garden use are authorised for amateurs, with labels written to be followed without training. Professional products are a different category by law and are not for householders to use, whatever is in the shed.
THE PART THAT DECIDES THE FINISH
Before you treat — by the lawn you have
The right treatment depends on what is actually wrong. Find the lawn that looks like yours and do its preparation first.
A thin, pale, hungry lawn
Grass is the main problem, not weeds or moss.
- Test the soil pH with a simple kit; lawns do best around pH 5.5 to 7
- Mow two or three days before feeding, and let the grass reach about 5 cm
- Water the lawn the day before if the soil is dry
- Choose a feed matched to the season, and spread it at the label rate
A mossy lawn
Moss through the grass, often in shade or damp.
- Find the cause: shade, compaction, poor drainage or cutting too short
- Apply a moss treatment first, at the label rate, and wait for the moss to blacken
- Rake or scarify out the dead moss once the label says it is safe
- Then feed and overseed the bare patches, and fix the cause
A weedy lawn
Dandelions, daisies, clover, plantains.
- Count them; a few weeds are a job for a knife or a spot spray
- Treat when weeds are actively growing, usually late spring to summer
- Do not mow for the days before and after that the label gives
- Do not use clippings from the first cuts after treatment as mulch or compost if the label says not to
A new lawn or new turf
Laid or sown in the last few months.
- Most weed and moss products are for established lawns only; read the minimum age on the label
- Use a pre-seeding or establishment fertiliser rather than a weed-and-feed
- Pull weeds by hand in the first months
- Wait for the lawn to establish before scarifying, which can be a year or more
A lawn with dead patches
Brown or bare areas that do not green up.
- Lift a patch of turf and look for grubs in the soil beneath
- Check for dog urine, spills, buried rubble or a dry, sandy patch
- Feed will not fix these; treat the cause, then overseed or patch
- If many patches appear at once in summer and do not recover, suspect a pest or disease and get advice
THE JOB
How to feed and treat a lawn, in order
Read the lawn and the label
20 minWalk the lawn and decide what is wrong, using the section above. Then read the whole label of the product you will use: what it treats, the minimum lawn age, the rate per square metre, the weather it needs, how long to keep children and pets off, and when you may mow and use the clippings. If the label and this guide ever differ, the label wins.
- Photograph the label on your phone so it stays readable in the garden
- Check the product is still authorised before using an old box
- Note the date you treat in a garden diary
Mistake to avoid: Buying a three-in-one because it is on offer when the lawn only needs feeding. You pay for herbicide you did not need and stress the grass.
Mow, rake and aerate first
45 minMow two or three days before a feed or treatment, so the grass has leaf to take it up. In spring, rake out dead grass and thatch with a spring-tine rake, and push a fork into compacted or mossy areas and rock it to let air and water in. Leave a few days after scarifying before you feed.
- Fork compacted patches about a hand's width apart, pushing the tines in as far as you can
- Rake in two directions at right angles to lift more thatch
- Collect the raked material; do not leave it on the grass
Mistake to avoid: Feeding straight onto a thatched, compacted lawn. Much of the product sits in the thatch and never reaches the roots.
Pick the weather and the day
5 minTreat when the grass is growing and the soil is moist, on a still, dry day with no heavy rain forecast for the time the label gives. Do not apply in frost or in hot, direct sun. Most labels want the grass dry when granules go on and rain or watering in afterwards.
- Late spring and early autumn are the usual windows
- Wind blows granules and spray onto beds and next door
- Heavy rain straight after washes product off and into drains
Mistake to avoid: Spreading on a hot, sunny day. Granules sitting on dry leaves in full sun scorch the grass.
Measure the area and the dose
15 minMeasure the lawn and work out how much product you need from the label rate, as in the calculator above. Weigh out what you need, or set your spreader to the setting the box gives for that product. Mark the lawn into strips with canes so you can see where you have been.
- Divide an odd-shaped lawn into rectangles and add them up
- Calibrate a new spreader on a measured square metre first
- Weigh out half the dose for each of two passes
Mistake to avoid: Guessing the dose. Too little does nothing; too much burns stripes into the lawn that take weeks to recover.
Spread evenly in two passes
30 minSpread half the dose walking up and down the lawn in parallel lines, then the other half walking across it at right angles. With a push spreader, start walking before you open the hopper and close it before you stop, so you never dump a pile. Overlap each line just enough to meet the last.
- Spread a header strip round the edges first, then fill in
- Keep a steady walking pace; slowing down overdoses
- Keep granules off paths and beds, and sweep up any that land there
Mistake to avoid: Spreading by hand in one pass. You get dark green stripes where it landed thickly and pale ones where it missed.
Spot-treat individual weeds
20 minFor a few weeds, spray each rosette directly with a ready-to-use lawn weedkiller, or dig it out with a narrow knife, getting as much of the root as you can. Spray on a calm day so the drift stays on the weed, and do not mow for the days the label gives so the weed has leaf to absorb it.
- Dandelions and docks have long tap roots; dig deep or they regrow
- Treat weeds when they are growing well, not in drought
- Fill the hole left by a dug weed with a pinch of soil and seed
Mistake to avoid: Spraying the whole lawn for a dozen dandelions. It is more chemical, more cost and more stress on the grass than the problem warrants.
Water in and keep off
10 minIf the label says to water in and no rain has fallen in the time it gives, water the lawn thoroughly with a sprinkler. Keep children and pets off for the period on the label. Wash your hands, the spreader and any measuring tools before you do anything else.
- Rinse the spreader on the lawn, not over a drain
- Put a sign on the gate so nobody forgets
- Store the box sealed, in its original packaging, out of reach
Mistake to avoid: Letting the dog straight back onto the lawn. The label's keep-off time is there for a reason.
Rake out dead moss
1 hrAfter a moss treatment, wait until the moss has turned black or brown and the label's waiting time has passed, then rake it out firmly. This is the satisfying, slightly alarming stage where the lawn looks worse before it looks better. Bag the moss; do not leave it on the grass.
- A spring-tine rake lifts moss better than a garden rake
- Expect much more moss than you thought was there
- Bag it rather than composting if the label says so
Mistake to avoid: Leaving dead moss in the lawn. It becomes thatch, holds water, and the moss returns faster.
Overseed the bare patches
30 minWhere moss or weeds have left gaps, lightly loosen the surface, scatter grass seed at the rate on the seed box, rake it in gently and keep it moist until it germinates. Check the treatment label first: some products need a gap of weeks before seed will grow.
- Use seed matched to your lawn type and shade
- Press the seed into contact with the soil with the back of the rake
- Water little and often until the seedlings are up
Mistake to avoid: Sowing seed straight after a weed-and-feed. The herbicide can stop it germinating, and you have wasted both.
The mistakes that scorch or waste a treatment
- Overdosing, or spreading unevenly by hand
- Treating in hot sun or before heavy rain
- Killing moss without raking it out or fixing the cause
- Using an old or professional product the label and the law do not allow
Stop here and get a lawn care specialist
- The problem needs a professional product, which only a person with a specified certificate may apply
- Patches keep dying in the same places despite feeding and watering
- A pest problem covers large areas of the lawn
- The lawn needs heavy renovation — hollow-tine aeration, top-dressing and overseeding over a large area
| WHAT YOU SEE | WHY, AND THE FIX |
|---|---|
| Lawn scorched or burnt after feeding | Too much product, uneven spreading, or applied in hot sun. Water heavily to dilute it; most scorched grass recovers in a few weeks, but badly burnt patches need reseeding. |
| Dark and pale stripes across the lawn | Uneven spreading, missed or overlapping lines. Spread in two passes at right angles next time; the stripes even out as the grass grows. |
| Lawn turned black after moss killer | That is the moss dying, as it should. Wait for the label's time, then rake it out and overseed the gaps. |
| Weeds still there after treatment | Applied when weeds were not growing, mown too soon, or rain washed it off. Wait for the time on the label before repeating, and spot-treat or dig survivors. |
| Grass seed not germinating | Sown too soon after a weed or moss treatment, or dried out. Check the label's gap before sowing, and keep seed moist. |
| Moss came back within months | The cause was not fixed: shade, damp, compaction or a low cut. Raise the mowing height, aerate, and improve drainage and light. |
| Rust-coloured stains on paving | Iron-based moss killer or feed landed on stone. Sweep granules off hard surfaces before watering; stains often fade with time. |
| Patches dying in summer and lifting easily | Possibly grubs eating the roots. Lift a patch and look; a widespread pest problem is one to get professional advice on. |
WHAT YOU SAVE
What it costs to do it yourself
| Seasonal lawn feed | £8–£27 |
|---|---|
| Moss treatment | £10.50–£12 |
| Lawn spreader | £10–£20 |
| Ready-to-use lawn weedkiller | £4.50–£17 |
| Lawn rake | £11–£16 |
| Gloves | £2–£5 |
| Total, first year | £46–£97 |
| DIY total | £46–£97 |
Guide prices compiled by the Locufy team from published Irish and UK provider price lists and 2026/27 cost guides. Updated 2026.
The spreader and rake last for years; after that the yearly cost is the products themselves. A lawn care specialist charges per treatment, so a programme of several a year adds up.
RATHER NOT?
Lawn care specialists near you, with prices shown
The ones who cover your area, nearest first, with one score from every review. No account needed to look.
Or post the job free and let them come to you.
Keep products in their original, closed containers, out of reach of children and pets, at an even temperature; a shed or greenhouse gets too hot and too cold. Never store diluted leftovers.
Empty plastic containers can go in household recycling, as HSE now advises; ask your council about unwanted products in their original packs, or use its hazardous waste service. Raked moss and clippings go in the council's garden waste collection if the label rules out composting.
Mow at the right height and often, and the lawn needs fewer treatments; most moss and weed problems start with a lawn cut too short.
Wash the spreader and sprayer on the lawn, dry them, and keep chemical-only cans and sprayers labelled and apart from watering ones.
Feeding and treating a lawn: questions people ask
Usually in spring with a higher-nitrogen feed, and in early autumn, roughly mid-September to mid-October, with a low-nitrogen, high-potassium autumn feed. Busy family lawns may take a summer feed too.
Only as the label says. Keep children and pets off for the time it gives, sweep up granules from paths, and store the product out of reach. HSE does not allow products to be marketed as child- or pet-safe.
Only if it is an amateur product, still authorised, and in its original labelled container. HSE says storing pesticides out of their original container is illegal, and professional products are not for untrained use.
That is the moss dying. Wait for the time on the label, rake it out firmly, and overseed the bare patches.
Check the label. Some lawn weedkillers say not to use the first few cuts as mulch or compost, because the herbicide can harm other plants.
The Locufy UK price guide puts lawn treatment at £25–£80 per treatment, typically £45. Most sell a programme of several treatments a year.
MORE GUIDES
More DIY guides
Sources — checked October 2026
- HSE — using pesticides in your garden, home or allotment: label, storage, disposal
- HSE — FAQ: professional pesticides and the specified certificate
- STIHL — how to fertilise your lawn: pH, timing, rates
- STIHL — how to scarify a lawn
- Plant Protection Products (Sustainable Use) Regulations 2012, regulation 1
- GOV.UK — find a local hazardous waste disposal service
- GOV.UK — dispose of garden waste
- Wickes — price check: lawn feed (coverage by area on each pack)
- Wickes — price check: moss killer
- Wickes — price check: lawn spreaders
- Wickes — price check: lawn weedkillers
- Wickes — price check: lawn rakes
- Wickes — price check: gardening gloves