Lawn Care Calendar & Feed Calculator (UK)

What do I need to know about Spring (March-May)?

March: first feed of the year as growth restarts. Spring feed: high nitrogen (e.g. 12:6:6 or 18:6:6) at 35g/m². Lift mower height for first cuts (40-50mm). Continue mowing as growth dictates. April: peak spring growth. Mow weekly, gradually lowering height to 25-35mm. Apply weed and feed if needed (Westland Aftercut, Evergreen Complete) — kills weeds while feeding grass. May: scarify lightly if not done in autumn (light vertical raking to remove dead grass). Overseed bare patches with grass seed matched to your existing lawn type, ideally after scarifying so the seed makes good contact with bare soil rather than sitting on top of thatch.

What should I know about Summer (June-August)?

June-July: peak season. Mow 1-2 times per week. Cut height 25-35mm (slightly longer in drought). NEVER scalp the lawn — never remove more than 1/3 of grass height in one cut. Summer feed (lower nitrogen, e.g. 9:7:7): June or July. Water deeply but infrequently in drought (1 inch/25mm per week applied in 1-2 sessions, NOT light daily watering). Mowing in heat: raise blade height to retain moisture. Leave clippings on lawn ('mulching') — returns 30% of nitrogen needed. August: late summer feed. Water in the early morning or evening to reduce evaporation loss and prevent leaf scorch from droplets under strong sun.

What should I know about Autumn (September-November)?

September: AUTUMN FEED — the most important feed of the year. High potassium and phosphorus, low nitrogen (e.g. 3:10:5). Strengthens grass for winter, root development. 35g/m² of autumn fertiliser. Scarify thoroughly (mechanical scarifier ideal) — removes thatch and moss. Apply moss killer if needed (iron sulphate-based, ferrous sulphate). Aerate compacted areas with hollow-tine aerator. Overseed bare patches and worn areas. October: continue mowing as growth slows. Raise cut height (40-50mm). Feed with an autumn lawn feed (higher potassium, lower nitrogen) to strengthen roots against winter frost rather than encourage top growth. November: final mow of the season once growth stops, clear fallen leaves regularly to prevent smothering and moss growth, and put the mower away for winter storage.

What should I know about Winter (December-February)?

Winter rest period for grass. Activities: avoid walking on frosty or waterlogged lawn — damages grass structure. Repair mower, sharpen blades for spring. Plan repairs for following spring. Service garden equipment. January: order grass seed and fertiliser for upcoming season. February (end of month): if mild, start considering spring feed for early March. Lift mower from shed, ensure sharp blade. Look for signs of moss, weeds requiring spring treatment. Important: a sharp mower blade is one of the cheapest and most effective things you can do for lawn health — a blunt blade tears grass rather than cutting it cleanly, leaving ragged, brown-tipped tips that are more vulnerable to disease. Get blades sharpened or replaced every winter before the mowing season starts, and avoid walking on frozen or waterlogged grass, which compacts the soil and damages the turf structure underneath.

What's the key thing to understand about Seasonal Lawn Care Timing?

Lawn care tasks performed at the wrong time of year can be ineffective or even counterproductive, which is why a seasonal calendar approach tends to produce better results than performing the same tasks year-round regardless of season. Spring is generally the key period for the first mow of the year (once growth has genuinely resumed and the ground has dried out enough to avoid compacting wet soil), applying a spring feed formulated to encourage green growth, and tackling moss or thatch buildup from winter through scarifying, since the grass has the growing season ahead of it to recover and fill in any bare patches created by the process. Summer typically calls for more frequent mowing at a slightly higher blade height (cutting too short in hot, dry weather stresses the grass and increases vulnerability to drought and weed invasion) and watering during extended dry spells, though established lawns are often more drought-tolerant than commonly assumed and can recover from browning in a dry summer once rain returns, without necessarily needing regular watering. Autumn is generally the best time for overseeding bare or thinning patches (cooler, damper conditions suit seed germination better than the stress of summer heat) and applying an autumn feed formulated to strengthen roots ahead of winter rather than encouraging the leaf growth a spring feed targets. Winter generally requires minimal active lawn care beyond avoiding walking on frosted or waterlogged grass, which can damage the grass structure or compact wet soil.

What should I know about Common Lawn Care Mistakes to Avoid?

Several common lawn care habits, often done with good intentions, actually work against a healthy lawn. Mowing too short ('scalping') is one of the most frequent mistakes, since cutting grass significantly shorter than its recommended height stresses the plant, reduces its ability to photosynthesise effectively, exposes soil to weed invasion in the gaps, and increases vulnerability to drought — a general rule of thumb is never removing more than roughly a third of the grass blade's length in a single cut, which sometimes means mowing more frequently during fast growth periods rather than less frequently at a shorter cut. Watering lightly and frequently, rather than deeply and less often, encourages shallow root growth that makes a lawn more vulnerable to drought stress, since the roots never develop deep enough to access moisture further down in the soil — when watering is needed at all, a longer, less frequent soak that penetrates deeper into the soil is generally more beneficial than frequent light sprinkling. Over-applying fertiliser, or applying the wrong type at the wrong time of year (a high-nitrogen spring/summer feed applied in autumn, for example, encouraging soft leaf growth right before winter when the plant should be hardening roots instead), can do more harm than good, sometimes scorching the grass or making it more vulnerable to winter damage and disease. Skipping aeration on compacted soil (common on lawns that see heavy foot traffic) is another frequent oversight, since compacted soil restricts root growth, water penetration, and nutrient uptake regardless of how well other lawn care tasks are otherwise performed.

Annual Task and Cost Overview by Season

Pulling the four seasonal sections into one combined view makes the recurring annual cost and time commitment of lawn care clearer than looking at any one season in isolation.

For a typical UK lawn of around 100-150m², total annual spend on feed, seed top-ups, and occasional treatments tends to fall somewhere between £60 and £150 a year for a DIY approach, rising to £300-£600+ a year if using a professional lawn care service for seasonal treatments — with spring and autumn being the two seasons where most of the year's spending and labour concentrate, since both are key growing windows for establishing new grass and recovering from summer wear or winter waterlogging.

Worked Example: Scheduling a Full Year on a 120m² Lawn

A homeowner with a 120m² lawn plans a full DIY annual programme. In spring, scarifying removes thatch and moss (roughly 2-3 hours of work, or £80-£120 if hiring equipment), followed by a spring feed at roughly £1/m² for granular fertiliser — £120 for the full lawn — and overseeding bare patches at around 35g/m² for a 5m² problem area, needing roughly 175g of seed, well under a typical 1kg bag costing £10-£15. Through summer, regular mowing (weekly, roughly 20-25 cuts across the growing season) is the main time cost rather than a cash one, alongside a summer feed at a lower nitrogen rate to avoid scorch, again around £120 for the full lawn. In autumn, aeration (hollow-tine or solid-tine, hired or contracted at roughly £50-£100 for a lawn this size) combined with an autumn feed higher in potassium for root strength (£110-£130) and a final overseed of any thin areas rounds out the growing season. Total annual cash cost across the three active seasons: roughly £120 + £120 + £120 + £15 (patch seed) + £75 (aeration) ≈ £450, which sits toward the higher end of DIY costs mainly because scarifying and aeration equipment hire was included — a homeowner skipping mechanical aeration most years and doing it only every 2-3 years would bring the typical annual average down closer to £300.