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Best liquid fertiliser: the right bottle for the job

Updated: October 2026

You want one bottle for the pots on the patio, and amazon.co.uk is happy to imply there is a single best liquid fertiliser for every plant. There is not. This capture keeps six listings and three jobs: an all-purpose NPK concentrate, a seaweed stimulant, and an autumn lawn liquid. The useful answer is which listing to buy for a stated job, and who should skip it. The [liquid fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/liquid-fertiliser) holds the prices and the shortlist. This page is the pick and the skip. We compared amazon.co.uk listings and public UK sources. This is not a laboratory test. Prices below are the capture snapshot.

You want one bottle for the pots on the patio, and amazon.co.uk is happy to imply there is a single best liquid fertiliser for every plant. There is not.

Our top picks

Invigortex GreenCare autumn lawn feed, 5 L

Best overall

Invigortex GreenCare autumn lawn feed, 5 L
10.0/10about £19.95
View offer
Doff Doff Liquid Growmore, 1 L

Best value

Doff Doff Liquid Growmore, 1 L
9.6/10about £6.55
View offer
Miracle-Gro Miracle-Gro All Purpose, 1 L

Alternative

Miracle-Gro Miracle-Gro All Purpose, 1 L
9.2/10about £8.94
View offer
On this page
  1. 1.There is no single best bottle
  2. 2.Best for mixed pots and baskets
  3. 3.Best tonic and best lawn bottle
  4. 4.Who should skip which bottle

There is no single best bottle

A geranium basket in June, a tray of cuttings and a tired lawn in September are not the same purchase. Doff 1 litre (about £6.55, 4.8 from 86) and the three Miracle-Gro sizes are concentrates for mixed plants. Maxicrop 2.5 litres (about £18.99, 4.6 from 3,688) is a seaweed stimulant with Soil Association wording. GreenCare (about £19.95, 5.0 from 1) is lawn grass at 5 ml per litre. Which? tested liquid feeds, including Doff Liquid Growmore 7-7-7 and Miracle-Gro All Purpose Liquid. Public text says liquids grew larger, more flowering plants than controlled-release, at a higher time and cost, and that Miracle-Gro concentrated liquid gave good seedling growth at the low dose. Scores and Best Buy names sit behind membership. This site does not quote a Which? winner. Keep the Miracle-Gro counts of 3,025, 10,350 and 72 apart. GreenCare's 5.0 is one incomplete United Kingdom text, not a reason to pour lawn liquid on houseplants. Label checks stay on the liquid fertiliser buying guide.

Best for mixed pots and baskets

For mixed pots and baskets, stay with an all-purpose concentrate. Doff at about £6.55 is the best value: model field 7:7:7, an integral measure, and indoor, outdoor and greenhouse use named. The stored score is 96 from 86 reviews. The mixing field is 1:466 against a brand page of up to 300 litres. Read the cap on the bottle. Miracle-Gro 1 litre at about £8.94 names indoor and outdoor use and prints 1:200. It has 4.6 from 10,350. One review says the seller sent 800 ml instead of 1 litre. The twin pack is about £7.98 for 1.6 litres, with a blank mixing field. A brand PDF prints 7-3-5. NPK is not on the listing. Skip the 2.5 litre bottle at about £18.72 if you need a can dose: its field is 2:1:2. Dilution steps sit on how to use liquid fertiliser.
Invigortex GreenCare autumn lawn feed, 5 L

Testsieger

Invigortex GreenCare autumn lawn feed, 5 L
10.0/10about £19.95
View offer

Best tonic and best lawn bottle

Maxicrop 2.5 litres is the only kept seaweed stimulant. Soil Association approval means it may be used in organic growing. It does not mean an organic 7-3-5. NPK is not on the listing. The item type is an organic plant growth stimulant. Reviews describe a watering can, a foliar spray or a seed soak, and they also name smell, stains, a leaking pourer and blocked fine sprayers. Use it beside a feed. GreenCare is the only lawn-labelled liquid here: 5 ml per litre, a watering can or a suitable sprayer, and a 500 m² line on the 5 litre wording. Title and weight say 5 litres and 5 kg; the volume fields say 10,000 ml. The stored score of 100 is that 5.0 from one incomplete text. It is the lawn row, not a pot feed.

Who should skip which bottle

Skip GreenCare for houseplants and baskets. Skip Maxicrop as the only feed. Skip the 2.5 litre Miracle-Gro when the listing must show a can dose before you pay. Mixed pots that need a cheap litre stay with Doff. Mixed pots that need the deepest review file and a 1:200 field stay with Miracle-Gro 1 litre. There is still no single bottle for every plant on this shelf.

Common questions

What is the best liquid fertiliser for mixed pots in this set?
Doff 1 litre at about £6.55 is the best value concentrate for mixed pots, with indoor, outdoor and greenhouse use named. Miracle-Gro 1 litre at about £8.94 is the deeper-reviewed 1 litre row with a 1:200 mixing field. Neither is a lawn bottle or a seaweed-only tonic.
Is Doff better value than Miracle-Gro 1 litre?
On capture price, yes: about £6.55 against about £8.94. Doff's sample is 86 reviews at 4.8. Miracle-Gro 1 litre is 10,350 at 4.6. Value here is the entry litre with a printed measure, not a claim that Doff outperformed Miracle-Gro in a lab on this site.
Should I buy the 2.5 litre Miracle-Gro or the twin 800 ml?
Buy the twin 800 ml if you want indoor use named and 1.6 litres without empty bullets. Buy 2.5 litres only if you already know the rate and will use the volume. The 2.5 litre mixing field of 2:1:2 is not a can recipe.
Is Maxicrop the best organic feed here?
No. It is the best kept tonic for organic growing, not a declared NPK feed. Soil Association approval is not a 7-3-5 analysis. Hungry crops still need a fertiliser beside it.
Who should skip GreenCare?
Anyone feeding houseplants, mixed pots or baskets. Anyone who needed a declared NPK and a settled pack size. The bottle is a lawn liquid with one incomplete review and a 5 litre versus 10,000 ml clash.
Can I add the three Miracle-Gro star counts together?
No. Twin 800 ml, 1 litre and 2.5 litres are separate listings. Keep 3,025, 10,350 and 72 apart. Live prices may differ from this capture.
Is a 5.0 from 1 review a reason to buy the lawn bottle?
No. That score is a scale of one incomplete United Kingdom text. Buy GreenCare only if the job is an autumn lawn and you accept the thin sample and the pack clash.

Related pages

Liquid fertiliser for houseplants

Seaweed or liquid feed

Liquid fertiliser

Liquid fertiliser buying guide: read the label first

How to use liquid fertiliser without scorching roots

Sources

Public UK and maker sources listed below, used for this page in October 2026. Prices, stars and review counts are from the six amazon.co.uk listings in the stored files. The star line is not a laboratory test. A Soil Association line means the product may be used in an organic growing system. It is not an NPK analysis. GreenCare's pack size is not reconciled.

  1. GOV.UK, manufacturing and marketing fertilisers (retrieved October 2026)
  2. Retained Regulation (EU) 2019/1009, Annex III (retrieved October 2026)
  3. RHS, how to feed plants (retrieved October 2026)
  4. RHS, seaweed products (retrieved October 2026)
  5. Miracle-Gro UK liquid label PDF (retrieved October 2026)
  6. Maxicrop Original label (retrieved October 2026)
  7. SBM advisory, Maxicrop NPK query (retrieved October 2026)
  8. Doff Liquid Growmore (retrieved October 2026)