Calculate exact liquid fertiliser dilution rates and product quantities for hose-end diluters, watering cans and foliar feeding. Covers spring, summer and autumn liquid feeds for UK lawns.
Choose your application method — watering can, hose-end diluter or knapsack sprayer — then enter your lawn area, product concentrate ratio and bottle size to get exact dilution rates and coverage quantities.
Calculate concentrate ml and water litres per watering can for your UK lawn area
Use this table to instantly find how much concentrate to measure out for different container sizes and dilution ratios.
| Dilution Ratio | Per 5 L can (ml conc.) | Per 9 L can (ml conc.) | Per 10 L tank (ml conc.) | Per 16 L tank (ml conc.) | Coverage per litre conc. |
|---|---|---|---|---|---|
| 1:9 (10% solution) | 500 ml | 900 ml | 1,000 ml | 1,600 ml | 10 m² |
| 1:19 (5% solution) | 250 ml | 450 ml | 500 ml | 800 ml | 20 m² |
| 1:29 (3.3% solution) | 167 ml | 300 ml | 333 ml | 533 ml | 30 m² |
| 1:49 (2% solution) | 100 ml | 180 ml | 200 ml | 320 ml | 50 m² |
| 1:99 (1% solution) | 50 ml | 90 ml | 100 ml | 160 ml | 100 m² |
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Timing liquid fertiliser correctly makes a significant difference to results on UK lawns — here is a month-by-month guide.
Lawn dormant or near dormant. Ground may be frozen. No feeding needed.
Still too cold for most UK lawns. Wait for consistent 8°C+ soil temperatures.
Apply a dilute spring feed in late March if grass is actively growing. Use a high-N spring formula.
First main spring liquid feed. Apply every 2–4 weeks as growth increases. High N (e.g. 15-5-5).
Peak feeding period. Apply fortnightly liquid feed for rich green colour and rapid growth.
Continue fortnightly feeds. Avoid applying in heat or drought — wait for rain or apply in the evening.
Reduce N if lawn is under drought stress. Iron-based tonic safe. Never apply to dry or scorched turf.
Resume regular feeding if rains return. Transition to lower-N, higher-K autumn formula from mid-August.
Apply autumn liquid feed — low N, high K (e.g. 4-4-12). Hardens grass for UK winter.
One final autumn feed in early October if grass still growing. Seaweed / iron tonic beneficial.
Grass growth slowing significantly. Feeding no longer effective. Risk of disease if applied late.
Lawn dormant. No feeding required. Plan your spring programme instead.
There are four main categories of liquid lawn fertiliser available to UK gardeners — each with a different purpose and season.
The go-to liquid feed for rapid greening and growth during the UK growing season. Can be applied via watering can or hose-end diluter. Always water in if no rain forecast.
Seaweed extract and biostimulant products improve root development, drought tolerance and disease resistance. Safe to apply even in dry conditions. Works brilliantly combined with a standard N feed.
High potassium autumn liquid feeds thicken cell walls and improve the lawn's resilience to UK winter conditions, frost, heavy rain and foot traffic. Low nitrogen avoids soft growth.
Liquid iron is the fastest way to intensify lawn colour, suppress moss and acidify the surface slightly. Results are visible within 48–72 hours. Avoid getting it on paths — it permanently stains concrete and paving.
Getting the dilution right and applying evenly are the two most important factors in successful liquid lawn feeding.
Measure the concentrate into the can first, then fill with water to the target volume and stir gently. Use a rose head attachment to spread the solution evenly — a stream setting applies liquid unevenly and risks concentrated spots. Work in parallel strips across the lawn, slightly overlapping each pass, and try to use the whole can on a measured strip width so you know you are hitting the correct rate.
Pour the measured concentrate into the diluter reservoir, attach to your hose and set the dial to the correct dilution ratio. Walk at a steady, consistent pace and keep the nozzle at the same height throughout for even coverage. Hose-end diluters are fastest for large lawns but can under-apply if water pressure fluctuates — check your pressure is consistent before starting.
Lawn: 80 m² | Dilution: 1:19 | Rate: 1 L/m² | 9 L can
⚠️ Foliar feed safety checklist
Expert answers on dilution rates, application methods, timing and product choice for UK liquid lawn fertilisers.
Use the calculator to find your exact dilution rate and concentrate volume, then choose the right product for your season and soil.
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