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Best organic liquid fertiliser for a stated UK job

Updated: October 2026

You want one bottle from an amazon.co.uk page that mixes a Soil Association stimulant, a 1:10 twin pack, a cold-pressed 5 L, a tomato litre, and a 5.0 from five reviews. Best organic liquid fertiliser here means a fit for a stated job in this capture, not a laboratory ranking. Stars cannot compare those jobs. The [organic liquid fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/organic-liquid-fertiliser) holds the nine rows and the prices. This page names a pick and a skip for each job. We compared amazon.co.uk listings and public UK sources, and we did not run a laboratory test. A qualifying purchase can earn a commission at no extra cost to you.

You want one bottle from an amazon.co.uk page that mixes a Soil Association stimulant, a 1:10 twin pack, a cold-pressed 5 L, a tomato litre, and a 5.0 from five reviews.

Our top picks

Sunshine Renewables UK Sunshine seaweed 2.5 L

Best overall

Sunshine Renewables UK Sunshine seaweed 2.5 L
10.0/10about £16.99
View offer
Maxicrop Maxicrop seaweed 2.5 L

Best value

Maxicrop Maxicrop seaweed 2.5 L
9.2/10about £18.99
View offer
Maxicrop Maxicrop organic tomato 1 L

Alternative

Maxicrop Maxicrop organic tomato 1 L
9.2/10about £11.99
View offer
On this page
  1. 1.There is no single winner on this shelf
  2. 2.A pick for each job, and who should skip it
  3. 3.Species, iron, and the bottles to skip as a mark
  4. 4.Pack size and the review sample

There is no single winner on this shelf

A 4.6 from 3,688 reviews and a 5.0 from five reviews are not the same evidence. Maxicrop 2.5 L sits on the first of those lines. Sunshine 2.5 L sits on the second. The card score on Sunshine 2.5 L is the highest in the file. That is a thin sample, not proof the bottle outperforms the Maxicrop tonic on an allotment. Treat the top pick badge as that score, not as a crop trial. The jobs also refuse one winner. Seven bottles are seaweed stimulants, one is a lawn liquid, and one is a tomato liquid with a high-potassium highlight. Capture prices run from about £11.99 to about £40.98. A cheaper litre is the right buy only when the job matches. The order of checks sits on the organic liquid fertiliser buying guide.

A pick for each job, and who should skip it

For a general tonic with a named body and a large review file, take Maxicrop 2.5 L at about £18.99. The bullet names the Soil Association. The listing is 1:100, and a maker label says 45 ml in 9 L (1:200). It is a stimulant, not a declared NPK. For tomatoes, peppers, chillies and aubergines, take the Maxicrop organic tomato 1 L at about £11.99. The highlight names those crops and high potassium. The mixing field reads 4:2:6, which is not this site's analysis, and reviewers report a leaking spout. For a UK lawn, take the Maxicrop organic lawn 1 L at about £12.19, every 4-6 weeks at 1:10 or 1:20. Skip it if you needed one settled control-body name.
Sunshine Renewables UK Sunshine seaweed 2.5 L

Testsieger

Sunshine Renewables UK Sunshine seaweed 2.5 L
10.0/10about £16.99
View offer

Species, iron, and the bottles to skip as a mark

For named Ascophyllum nodosum, a cold-pressed process, and OF&G, take Shropshire 5 L at about £40.98, listed at 1:500. The line of up to 2,500 litres is 5 times 500 arithmetic, not a solids test. Skip it if you only wanted the cheapest litre. For seaweed plus chelated iron, the only named row is Sunshine 6 L at about £29.99, listed at 1:400, on 4.4 from 8 reviews. Skip Sunshine, Topline and Vitax as a mark: their titles say organic and the captured bullets do not name a control body. The mark argument sits on Soil Association organic liquid fertiliser. How you dilute the bottle you bought sits on how to use organic liquid fertiliser.

Pack size and the review sample

Vitax's title says 1 litre while the item and volume fields say two litres, with no mixing ratio in the attributes. Sunshine 5 L at about £25.99, 4.7 from 128 reviews, is a larger stimulant without a named body. Topline 2 x 1 L at about £16.99 prints 1:10 from March to August. If you accept five reviews, Sunshine 2.5 L can stay. Do not call that a rank.

Common questions

What is the best organic liquid fertiliser?
There is no single best bottle in this capture. For a general tonic with a named body and a large review file, Maxicrop 2.5 L is the fit. For tomatoes, take the tomato litre. For a lawn, take the lawn litre. For named species and OF&G, take Shropshire. Stars do not merge those jobs.
Which bottle if I need Soil Association on the label?
Maxicrop 2.5 L names the Soil Association on the bullet. The lawn and tomato litres also carry a Soil Association string on the highlight, next to OF&G on the bullet, without a certificate in the file. Check the live directory if you are inspected. Sunshine, Topline and Vitax do not name a body.
Which bottle for tomatoes?
The Maxicrop organic tomato 1 L is the feed-shaped bottle here, at about £11.99, with peppers, chillies and aubergines on the highlight. It is not the 2.5 L stimulant. A seaweed tonic can sit beside it. It should not replace it after fruit set. Watch the spout: reviewers report leaks and stains.
Is Shropshire worth about £40.98?
It is worth that price if you wanted named Ascophyllum nodosum, a cold-pressed claim, OF&G, and 5 L at 1:500. It is not worth it as a cheaper substitute for Maxicrop 2.5 L. The 2,500 litre claim is listing arithmetic. This site did not measure solids.
Should I trust a 5.0 from five reviews?
Not as a rank. Sunshine 2.5 L holds that line. Four written reviews in the file are one line each. Maxicrop 2.5 L at 4.6 from 3,688 is the deeper sample. The top pick badge follows the highest score. It is not a crop trial.
Who should skip Sunshine or Topline?
Skip them if you need a named UK control body. Skip Sunshine 2.5 L if you treat five reviews as a league table. Skip Topline if you would copy a 1:200 cap onto its 1:10 listing. Home gardeners who do not need a mark can still use either as a stimulant.
Is Vitax a 1 L or a 2 L buy?
The title says 1 litre. The item count and volume field say two litres. Check the image and the label before you compare price per litre. Until those fields agree, do not pick Vitax as the best-value pack.

Related pages

Seaweed fertiliser or liquid feed

Organic liquid fertiliser

Organic liquid fertiliser buying guide for UK pots

Soil Association organic liquid fertiliser, UK mark

How to use organic liquid fertiliser on this bottle

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 nine stored amazon.co.uk listings. A title that says organic is not a control-body certificate. The 4:2:6 tomato field is not an analysis from this site. Shropshire's 2,500 litre line and Sunshine's 500 litre line are listing arithmetic. A 5.0 from five reviews is not a crop trial.

  1. RHS, Seaweed products (retrieved October 2026)
  2. RHS, Biostimulants (retrieved October 2026)
  3. RHS, How to feed plants (retrieved October 2026)
  4. GOV.UK, Manufacturing and marketing fertilisers (retrieved October 2026)
  5. GOV.UK, Organic farming certification (retrieved October 2026)
  6. OF&G, Approved inputs (retrieved October 2026)
  7. SBM, Maxicrop NPK query (retrieved October 2026)
  8. Maxicrop Original label (retrieved October 2026)