Independent comparisons. We may earn from shop links. More info

How to apply liquid lawn fertiliser

Updated: October 2026

You already have a bottle on the potting bench, and the risk now is stripes, scorch, or a wasted litre because the rate on the listing never made it into the can. How to apply liquid lawn fertiliser is a method page: printed rates, even coverage, no frost, pets off until the grass is dry, and not judging a hose bottle by feel. The [liquid lawn fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/liquid-lawn-fertiliser) keeps the six listings. This page does not rank them. If you still need to choose a can against a hose, use [watering can or hose](/hub/fertiliser-soil-and-bark-mulch/liquid-lawn-fertiliser/sub/liquid-lawn-fertiliser-watering-can-or-hose).

You already have a bottle on the potting bench, and the risk now is stripes, scorch, or a wasted litre because the rate on the listing never made it into the can.

Our top picks

Miracle-Gro Miracle-Gro Fast Green concentrate, pack of 2 × 1 L

Best overall

Miracle-Gro Miracle-Gro Fast Green concentrate, pack of 2 × 1 L
9.2/10about £13.54
View offer
Westland Westland Safelawn Liquid, 1 L

Best value

Westland Westland Safelawn Liquid, 1 L
8.8/10about £8.90
View offer
Miracle-Gro Miracle-Gro EverGreen Fast Green Spray & Feed, 1 L

Alternative

Miracle-Gro Miracle-Gro EverGreen Fast Green Spray & Feed, 1 L
8.6/10about £11.70
View offer
On this page
  1. 1.Read the rate on your bottle
  2. 2.Weather, mowing, and a dry lawn
  3. 3.Apply evenly
  4. 4.Stop, and fit the valve

Read the rate on your bottle

Westland is 50 ml per 4.5 L to cover 5 m², about 100 m² from the 1 L bottle. Shake first. Every 1–2 weeks from March to October, not in frost. The brand sheet says no water-in, and it also mentions doubling for faster greening. This page does not adopt the double rate. GreenCare, on all three GC-GFEED titles, is 5 ml per litre in a can or sprayer, on autumn and early-winter bullets. Confirm the fill before you scale 5 ml across a 500 m² claim. See autumn liquid lawn fertiliser. The hose spray is ready to use, up to 100 m². The mixing field 1:0:0 is not a millilitre dose. The 2025 label says a repeat after six weeks, pets back when dry, and a double check valve. A bottle that still feels heavy is not a completed 100 m². The twin concentrate is dilute and apply. The capture has no millilitre rate. Reviews name a watering can and a fine rose. Do not copy 35 ml in 5 L or 40 ml in 4 L from a sibling page. A 5 m² strip takes one Westland mix of 50 ml in 4.5 L, not a bit extra because last week looked pale.

Weather, mowing, and a dry lawn

Do not apply in frost or onto drought-hard grass. A waterlogged lawn is a drainage job. Westland’s sheet says you can apply after mowing and that you do not water the feed in. The Miracle-Gro spray FAQ says do not apply to wet grass. Follow the bottle you bought. Pets and children stay off until the grass is dry. Pet friendly in a review is not permission for a dog to drink the concentrate. GreenCare’s 10 L title leaves pets unanswered. Do not put every bottle on a weekly calendar because Westland says 1–2 weeks. Do not empty leftover mix into a road drain.
Miracle-Gro Miracle-Gro Fast Green concentrate, pack of 2 × 1 L

Testsieger

Miracle-Gro Miracle-Gro Fast Green concentrate, pack of 2 × 1 L
9.2/10about £13.54
View offer

Apply evenly

Use a fine rose. A coarse rose dumps stripes, and one concentrate review says the grass may burn. On the hose bottle, the first 50 UK texts describe a bottle that barely drops, then dumps. If the connector pops off, stop and refit, or pour the rest into a can. Keep the fan off slabs and fencing.

Stop, and fit the valve

The Miracle-Gro spray label asks for a double check valve under the Water Supply (Water Fittings) Regulations 1999. Do not leave the hose in a bucket, a pond, or a drain. A permanent mains injector is a plumber or water-company job. Stop when the printed area is covered, frost is due, or the bottle has no rate you can follow. Which listing to buy is on best liquid lawn fertiliser.

Common questions

What rate do I use for Westland, GreenCare, and the Miracle-Gro bottles?
Westland: 50 ml per 4.5 L covers 5 m². GreenCare: 5 ml per litre. The hose spray is ready to use, up to 100 m², with no millilitre dose. The twin concentrate is dilute and apply, with no millilitre field in this capture. Read the bottle you hold. Do not copy 35 ml in 5 L or 150 ml in 10 m² from other Miracle-Gro liquids onto these listings.
Can I apply in frost or drought?
No. Westland prints a frost stop. Growing-season liquids belong on growing grass, not frozen or drought-hard turf. Wait. A second pass will not rescue scorched or dormant grass, and it raises the chance of stripes.
Do I water the feed in?
Only if that bottle’s label says so. Westland’s sheet says no water-in. The Miracle-Gro spray FAQ says do not apply to wet grass. Those are not the same instruction. If the label is silent, do not invent a wash-down, and do not spray onto a soaking lawn.
When can pets go back on the lawn?
When the grass is dry. That is the Miracle-Gro spray label and the honest reading of Westland’s keep-away storage line. Reviewer phrases such as pet friendly do not mean a dog may drink the concentrate or walk on wet grass. GreenCare’s 10 L title does not answer the pets question in the bullets.
Why does the hose bottle still look full after 30 minutes?
That is the metering pattern in the first 50 UK texts: inconsistent feed, leftover concentrate, or a head that fails so people pour the liquid into a watering can. The trigger has no level marks. Do not assume you have finished 100 m² because the bottle still feels heavy, and do not assume you should spray longer to empty it.
Will a coarse rose burn the grass?
It can. One concentrate review says apply evenly with a fine rose or the grass may burn. A coarse rose dumps a richer mix in stripes. Walk on, overlap lightly, and stop when the printed area is done rather than soaking one patch.
Does a double check valve matter on a hose-end bottle?
Yes, on the Miracle-Gro spray. The 2025 label asks for a double check valve. Do not leave the hose in a bucket or a drain. That is a water-fittings point, not a fertiliser-strength point. A permanent injector on the mains is a professional job.

Related pages

Liquid lawn fertiliser buying guide

Liquid lawn fertiliser

Autumn liquid lawn fertiliser after August in the UK

Best liquid lawn fertiliser for can, hose or autumn

Liquid lawn fertiliser watering can or hose choice

Sources

Public UK and maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the six amazon.co.uk listings captured on 19 October 2026. A pet-friendly review is not a guarantee. The GreenCare litre fields are not reconciled. Westland NPK 6-2-4 is the brand sheet, not a figure printed on that amazon capture. The hose-end 27-0-0 is the 2025 label, not a figure for the concentrate or the autumn titles. The Farming Rules for Water bind agricultural land managers in England, not a typical householder.

  1. RHS spring and summer lawn care (retrieved 19 October 2026)
  2. RHS autumn lawn care (retrieved 19 October 2026)
  3. The Fertilisers Regulations 1991 (retrieved 19 October 2026)
  4. HSE garden pesticides (retrieved 19 October 2026)
  5. Water Supply (Water Fittings) Regulations 1999 (retrieved 19 October 2026)
  6. Westland SafeLawn technical sheet (retrieved 19 October 2026)
  7. Miracle-Gro Fast Green Spray & Feed 2025 label (retrieved 19 October 2026)
  8. GOV.UK Farming Rules for Water (retrieved 19 October 2026)