❄️ Winter — December, January, February
Lawn Dormancy & Rest Period
UK lawns are largely dormant in winter. Grass growth slows dramatically below 5°C soil temperature and stops entirely in frosts. Your primary job is to protect the lawn from damage — not improve it. Minimal intervention is the rule.
January
❄️ Deep Winter
3–7°C
Average UK temp
Mow?
❌ No — dormant
Feed?
❌ No nitrogen
Scarify?
❌ No
Weed?
❌ No
What To Do
- Stay off the lawn when frozen or frosted — walking on frozen grass crushes and kills the leaf tissue, leaving brown footprint marks that persist for weeks
- Stay off waterlogged lawns — walking or working on saturated clay soil causes severe compaction that takes months to recover
- Apply iron sulphate (ferrous sulphate) in mild, frost-free spells — hardens grass tissue, kills surface moss and improves winter colour
- Plan your annual lawn programme — order seeds, fertilisers, nematodes and equipment now to beat spring shortages
- Service and sharpen mower blades — January is ideal for dealer servicing before the spring rush
- Remove debris, fallen branches or leaves that have accumulated since autumn
- South West England (Cornwall/Devon): grass may still be growing slowly in mild January spells — a very light high-cut mow (6cm) is acceptable if the ground is not frozen or waterlogged
What NOT To Do
- Do NOT apply nitrogen fertiliser — encourages soft growth vulnerable to frost damage and disease
- Do NOT scarify or aerate frozen or very wet ground
- Do NOT apply weedkiller — ineffective on dormant weeds and may damage stressed grass
- Do NOT mow — no active growth to cut and blades damage frozen leaf tissue
February
❄️ Late Winter
4–9°C
Average UK temp
Mow?
⚠️ SW only, high cut
Feed?
⚠️ Iron sulphate only
Scarify?
❌ Too early
Aerate?
⚠️ Clay — if dry enough
What To Do
- Apply iron sulphate / moss killer on mild frost-free days — February is an excellent moss treatment month as spores are less active
- Lightly rake off any dead moss from autumn treatments using a spring-tine rake — do not scarify deeply yet
- On clay soils (Home Counties): if the soil has dried out enough, carry out hollow-tine aeration — clay structure is good for core removal in late winter
- Check lawn edges and repair any damage from winter — recut edges with a half-moon edger once ground firms up
- Order spring grass seed, pre-turfing fertiliser and spring NPK feed — demand is high in March
- If moss is very heavy after a wet winter, apply a second iron sulphate treatment 4–6 weeks after the first
- South West / mild areas: first mow of the year on a dry day — set mower high (6cm). Remove only the top growth.
What NOT To Do
- Do NOT apply nitrogen feed yet — soil temperature still too low for grass to use it effectively (risk of leaching and disease)
- Do NOT scarify heavily — grass cannot recover fast enough in cold conditions
- Do NOT walk on frosty grass — late February frosts still occur across the UK
🌱 Spring — March, April, May
Lawn Revival & Growth Season
Spring is the most active and important season for UK lawn care. Grass resumes growth, responds strongly to feeding, and this is the window to repair winter damage, scarify if needed and establish strong growth before summer. Do not rush — wait for soil temperatures above 7°C before feeding.
March
🌱 Early Spring
6–12°C
Average UK temp
Mow?
✅ Yes — high cut 5–6cm
Feed?
✅ Spring NPK from mid-March
Scarify?
⚠️ Light only
Aerate?
✅ Yes if not done Feb
Mowing
- First proper mow of the year — set mower to highest setting (5–6cm). Never remove more than one-third of the blade length in one cut
- Ensure mower blades are sharp before first use — blunt blades tear grass, leaving ragged brown edges vulnerable to disease
- Mow when grass is dry — wet grass clogs mower and compacts the surface
- Early March: mow every 2 weeks. Late March: mow weekly as growth accelerates
Feeding & Treatment
- Apply spring lawn fertiliser (high nitrogen — e.g. 12:4:8 or similar) from mid-to-late March once soil reaches 7–10°C. Apply on a dry day before rain.
- Continue iron sulphate if moss still present from winter — March is still an excellent moss treatment month
- Apply wetting agent to sandy and chalk soils now — before the dry season begins
- Scarify lightly to remove dead moss from iron sulphate treatment and thin thatch layer — do NOT deep scarify in spring as grass cannot recover as quickly as in autumn
- Hollow-tine aerate if not done in February — follow with sandy loam top dressing on clay soils
- Overseed bare patches — good soil temperature for germination by late March. Keep seeded areas moist.
April
🌸 Mid Spring
8–15°C
Average UK temp
Mow?
✅ Weekly 3–4cm
Feed?
✅ If not done March
Weed control?
✅ Begin April–May
Overseed?
✅ Best spring window
Mowing
- Mow weekly — lower cutting height gradually to 3–4cm for standard lawns. Fine ornamental lawns: 2–2.5cm. Hard-wearing family lawns: 4–5cm.
- Start collecting clippings — heavy spring growth left on the lawn creates thatch and shades out grass
- Begin creating crisp lawn edges with a half-moon edger or lawn edging tool
Feeding & Treatments
- Apply spring NPK feed if not applied in March. By late April soil temperature is reliably above 10°C — grass utilises nutrients effectively.
- Apply selective broadleaf weedkiller from late April when weeds are in active growth — targets daisies, dandelions, clover, plantain and speedwell without harming grass
- Overseed thin areas — April is the last reliable spring overseeding window before competition from summer weeds increases. Use matched seed species.
- Hollow-tine aerate on clay soils if not done in February/March — last opportunity before summer heat sets in
- Do NOT apply weedkiller within 4 weeks of overseeding — it will kill new seedlings
May
🌷 Late Spring
11–18°C
Average UK temp
Mow?
✅ Twice weekly if needed
Summer feed?
✅ Apply now
Weed control?
✅ Continue
Irrigation?
⚠️ Sandy/chalk soils only
Mowing
- Mow twice weekly in rapid growth periods — grass can grow 50mm+ per week in warm, wet May conditions
- Maintain cutting height at 3–4cm. Do not scalp — raises drought stress risk heading into summer
- Use grass clippings as a thin mulch on borders or add to compost — rich in nitrogen
Feeding & Treatments
- Apply summer slow-release fertiliser (lower N, balanced K) — slow-release granules feed for 8–12 weeks, bridging spring into summer
- Continue selective weed control — May is peak activity for broadleaf weeds, maximising herbicide effectiveness
- Apply moss control on any remaining patches — last effective treatment before summer heat reduces moss activity
- Begin irrigation on SE England sandy and chalk soils — dry spells from May onwards cause rapid drought stress on fast-draining soils
- Watch for red thread disease in cool, damp May evenings — pink/red threads on grass blades. Apply nitrogen feed and improve drainage.
☀️ Summer — June, July, August
Drought Management & Stress Period
UK summers — especially in the South East — bring the greatest stress to lawns. Growth slows in July–August heat, drought risk is high, and hosepipe bans may apply. The key rule: raise your mowing height, stop feeding in drought, and never panic about a brown lawn — it will recover.
June
☀️ Early Summer
14–20°C
Average UK temp
Mow?
✅ Weekly — raise to 4–5cm
Feed?
⚠️ Stop if drought begins
Water?
✅ Early morning — 20–25mm
Weed?
✅ Continue broadleaf control
Mowing
- Raise mowing height to 4–5cm now — taller grass shades the soil surface, reducing moisture evaporation and root temperature stress
- Mow weekly — growth still active in June in most UK regions. Leave clippings as a light mulch in dry conditions.
- Do NOT mow below 3.5cm in summer — short grass is far more vulnerable to drought browning and disease
Watering & Feeding
- Water early morning (6–9am) — avoids evaporation loss and fungal disease from overnight dampness. Apply 20–25mm per week.
- Water deeply twice a week rather than shallowly every day — encourages deep root growth for better drought tolerance
- Apply liquid seaweed biostimulant — improves drought resistance and stress recovery
- Stop nitrogen feeding if a dry spell begins — fertiliser on drought-stressed roots causes burn
- Check your water authority's hosepipe ban status — SE England bans can apply from June in dry years
July
🌞 Mid Summer
16–23°C
Average UK temp
Mow?
⚠️ Only if actively growing
Feed?
❌ Stop during drought
Scarify?
❌ Never in summer
Overseed?
❌ Too hot/dry
Mowing
- Set mowing height to 5–6cm minimum — this is the most important single action for summer lawn survival
- Only mow if grass is actively growing and green — if it has gone dormant and brown, do NOT mow
- Do NOT mow dormant brown grass — mowing removes stored carbohydrates the plant needs for recovery
- Do NOT mow in the heat of the day — early morning or evening only
Drought Management
- Allow controlled dormancy if under hosepipe ban — grass survives up to 6 weeks without water in dormancy. It WILL recover in autumn.
- If watering: 25mm twice per week — deep soak is far more effective than daily light sprinkling
- Use grey water (bath/washing up water) from watering cans if hosepipe ban is in force — legal and effective
- Do NOT apply any fertiliser to drought-stressed lawn — roots cannot absorb nutrients and chemical burn occurs
- Do NOT apply weedkiller in drought — ineffective on stressed weeds and can damage grass
- Plan your September renovation now — order seed, nematodes and autumn fertiliser in July to ensure availability
August
🌡️ Late Summer
16–22°C
Average UK temp
Mow?
⚠️ High cut only if growing
Feed?
❌ Not yet
Plan renovation?
✅ Order supplies now
Order nematodes?
✅ For September use
August Tasks
- Order nematodes (Steinernema feltiae) now for September application — they have a short shelf life and sell out quickly. Refrigerate on arrival.
- Order autumn lawn seed, autumn fertiliser (high K) and top dressing materials — be ready to act immediately in September
- Continue mowing at 5cm+ if grass is still growing — North of England and Scotland often see renewed growth by mid-August
- Watch for lawn rust (orange/yellow powder coating grass blades) — more common in dry summers. Apply nitrogen feed when conditions improve.
- Watch for starlings and crows pecking at lawn — early indicator of leatherjacket hatch. Confirm with plastic sheet test (cover 0.5m² overnight)
- Crane fly (daddy longlegs) season peaks in August — the adults lay eggs in your lawn. This year's leatherjacket problem will become visible from September.
🍂 Autumn — September, October, November
The Most Important Season — Annual Renovation
Autumn is the single most important season for UK lawn care. September in particular is the optimal month for almost every major lawn treatment — scarification, aeration, overseeding, autumn feeding and pest treatment all work best now. Soil is warm, rainfall increases, and grass has maximum growing time before winter.
September
🍂 Early Autumn — KEY MONTH
13–18°C
Average UK temp
Scarify?
✅ Optimal — DO IT
Aerate?
✅ Optimal — DO IT
Overseed?
✅ Optimal — DO IT
Nematodes?
✅ Apply now (soil >10°C)
September Priority Tasks — In Order
- 1. Scarify — remove thatch and dead moss build-up. Use a petrol scarifier (hire £60–90/day) set to light-medium depth. Rake off all debris. The lawn will look terrible for 2 weeks — this is normal.
- 2. Hollow-tine aerate — core aerate immediately after scarifying. Relieves compaction, improves drainage, creates channels for seed and top dressing to penetrate.
- 3. Top dress — brush sandy loam or compost into aeration holes. Use a stiff brush or back of a rake. Levels the surface and improves soil structure long-term.
- 4. Overseed — broadcast seed at 35g/m² over the whole lawn and 50g/m² on bare patches. Rake in gently. Keep moist for 3 weeks. Soil temperature above 10°C ensures good germination.
- 5. Apply autumn fertiliser — high potassium, low nitrogen feed. Hardens grass for winter, promotes root growth not leaf growth. Do NOT use a spring/summer high-N feed.
- 6. Apply nematodes — if leatherjackets confirmed (plastic sheet test or bird activity). Dilute and apply with watering can or sprinkler. Water in immediately. Soil must be above 10°C and moist.
- Continue mowing at 4–5cm height — reducing height slightly from summer but not cutting too short before winter
October
🍁 Mid Autumn
9–14°C
Average UK temp
Mow?
✅ Reduce frequency
Overseed?
⚠️ Early Oct — last chance
Nematodes?
✅ If soil still >10°C
Iron sulphate?
✅ Apply now
October Tasks
- Apply iron sulphate — hardens grass for winter, darkens colour, kills surface moss before it establishes in autumn rains
- Remove fallen leaves immediately — leaves smothering grass for more than 2–3 days can kill the grass beneath by blocking light and promoting fungal disease
- Continue nematode application if soil is still above 10°C — check with a soil thermometer. Once below 10°C, nematodes become ineffective.
- Final overseed opportunity in early October — soil is cooling but still warm enough for germination in mild areas
- Reduce mowing frequency to every 10–14 days as growth slows. Maintain height at 4–5cm — do not cut shorter going into winter.
- Watch for fusarium patch disease — circular patches with white/pink fungal mycelium. Cool, wet, calm October nights are high risk. Apply iron sulphate as preventative treatment.
- Complete any second hollow-tine aeration on clay soils that were not treated in September
November
🍃 Late Autumn
6–11°C
Average UK temp
Mow?
⚠️ Final cut — 4–5cm
Feed?
⚠️ Iron sulphate only
Scarify?
❌ Too late
Nitrogen?
❌ Absolutely not
November Tasks
- Final mow of the season — set height to 4–5cm. Never cut shorter than 4cm going into winter — short grass is vulnerable to frost damage and moss invasion
- Continue removing fallen leaves — November leaf fall can be heavy. Use a leaf blower or rake regularly. Leaves left on the lawn cause yellow/dead patches.
- Apply iron sulphate in a mild spell — last autumn application. Controls moss, hardens grass for winter, helps maintain colour.
- Hollow-tine aerate clay soils if still workable — last opportunity before winter waterlogging. Earlier the better.
- Clean and store lawn equipment — drain petrol from mower tank or add stabiliser, clean blades with an oily rag, store in dry conditions
- Do NOT apply nitrogen fertiliser after October — promotes soft growth that is immediately damaged by frost
- If overseeded areas from September have established well (2–3cm growth), give them a very light first trim at the highest mower setting to encourage tillering
December
❄️ Early Winter
4–8°C
Average UK temp
Mow?
❌ Unless SW mild spell
Feed?
⚠️ Iron sulphate if mild
Traffic?
❌ Off frozen/wet lawn
Plan?
✅ Order next year's supplies
December Tasks
- Keep the lawn clear of garden furniture, toys, or anything that blocks light — even in winter, smothered grass weakens and dies
- Stay off the lawn when frozen or waterlogged — December compaction damage is the most common winter lawn problem
- Apply iron sulphate in a mild, frost-free spell — controls moss through the winter months
- South West: light mow at 6cm height setting on frost-free days if grass has grown 2–3cm since November cut
- Service mower — December is ideal. Book a dealer service now before the spring rush (March–April).
- Plan next year's full programme — order spring fertiliser, seed and equipment in December to beat March shortages
- Review this year's results: where did moss appear? Where was drought damage worst? Which areas need overseeding? Plan September renovation accordingly.
Annual At-a-Glance Overview
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
★ Optimal/Priority
✓ Suitable
~ Marginal/SW only
— = Not recommended
Annual Lawn Care Checklist — Tick Off As You Go
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Frequently Asked Questions
Apply your first spring lawn feed when the soil temperature reaches a consistent 7–10°C — typically mid-to-late March in the South of England and early-to-mid April in the North of England and Scotland. Do not apply by date alone — apply by soil temperature. A simple soil thermometer (£8–12) pays for itself in avoided waste from feeds applied too early. Applying nitrogen before the soil is warm enough means the grass cannot absorb it — it leaches away, wastes money, and can contribute to algae growth on hard surfaces. Signs that the lawn is ready to feed: active new green growth visible, lawn responds to mowing again, morning dew on blades.
September combines the three conditions needed for maximum lawn treatment effectiveness: (1) Soil is still warm from summer (above 10°C) — seeds germinate readily, nematodes are active, and grass roots absorb nutrients efficiently. (2) Rainfall increases — natural irrigation supports overseeding and recovery without requiring manual watering. (3) Weed competition is lower — annual weeds die back in autumn, giving new grass seedlings a better chance to establish. Scarifying, aerating, overseeding and feeding all work better in September than any other month. If you only do one major lawn renovation per year, do it in September — the results are dramatically better than spring renovation for the same amount of work.
Mowing height should vary seasonally for a UK lawn: Winter (Dec–Feb): No mowing or very high (6cm+). Early spring (March): 5–6cm — first cuts should be high to avoid shock. Active growth (April–June): 3–4cm for standard lawns, 2.5–3cm for fine ornamental lawns, 4–5cm for hard-wearing family lawns. Summer drought (July–August): 5–6cm minimum — taller grass resists drought and shades the soil. Autumn renovation (September): reduce back to 4–5cm before scarifying. Pre-winter (October–November): 4–5cm — never go into winter shorter than 4cm. The golden rule is never remove more than one-third of the total leaf blade length in a single mowing — this causes physiological shock and temporary browning.
A light spring scarification is acceptable in March–April but should be far gentler than the main autumn renovation. In spring, only remove the surface layer of dead moss and light thatch — do not set the machine deep enough to remove healthy grass. The reason autumn is preferred for main scarification: grass has all summer ahead to recover from autumn renovation, whereas spring scarification leaves the lawn looking poor just as summer and heavy use begins, with less recovery time before the challenging summer period. If your lawn has a heavy thatch problem, do a full renovation in September and only a light surface raking in spring. Never scarify in summer or when the lawn is drought-stressed.
The key difference: dormant grass has living crowns (the growing points at soil level) even when the leaf blades are brown. Dead grass has dead crowns. To test: pull a small section of brown turf — if the crowns are firm, white-cream in colour and resist being pulled up, the grass is dormant and will recover. If the crowns are brown, soft, mushy and the turf lifts easily with no resistance, the grass may have died. In 90%+ of UK summer lawn browning cases, the grass is dormant — not dead. Normal dormancy: grass goes brown within 2–4 weeks of drought, then greens up fully within 2–3 weeks of the first significant autumn rainfall (typically September). True dead grass: fails to green up after 3–4 weeks of autumn rainfall and irrigation.