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Best cannabis fertiliser

Updated: October 2026

A single winner across a coco base, a bloom liquid and a sugar additive would be a false ranking. The best cannabis fertiliser in this folder is a listing for one job, with a reason to skip the others. Prices and stars below are from the amazon.co.uk rows in our [cannabis fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/cannabis-fertiliser) on 19 October 2026. The Products Compared editorial team compared those listings and did not run a lab or a harvest trial. A qualifying purchase can earn a commission at no extra cost to you. Brands that appear on other UK shops and are not in this folder are left out.

A single winner across a coco base, a bloom liquid and a sugar additive would be a false ranking. The best cannabis fertiliser in this folder is a listing for one job, with a reason to skip the others.

Our top picks

CANNA CANNA Coco A and B 1L set

Best overall

CANNA CANNA Coco A and B 1L set
9.4/10about £17.56
View offer
Advanced Nutrients Advanced Nutrients Big Bud 250 ml

Alternative

Advanced Nutrients Advanced Nutrients Big Bud 250 ml
9.0/10about £12.25
View offer
Advanced Nutrients Advanced Nutrients Bloom pH Perfect 500 ml

Preis-Tipp

Advanced Nutrients Advanced Nutrients Bloom pH Perfect 500 ml
9.0/10about £10.62
View offer
On this page
  1. 1.Best coco base in this comparison
  2. 2.Best-value bloom liquid
  3. 3.Best-known flower booster
  4. 4.Who should skip the additives

Best coco base in this comparison

The coco base with the stronger review file is CANNA Coco A and B, ASIN B003VN7272, at £17.56. It is 4.7 from 1,969 reviews. The liquid-volume field says 1 litre, the item weight is 998 g, and the listing describes an A and B set for coco across growing and flowering. That is the top pick for a coco base in this set: a complete two-part feed, a large review file, and a volume field that matches the title. It is not a measured yield. Reviewers on this listing say a pH meter is still necessary. One review says the instructions on the B bottle are in French. If coco is not the medium on your bottle, this pick is the wrong row. The buying guide sets the job before the name.

Best-value bloom liquid

The lowest shelf price in the folder is Advanced Nutrients Bloom pH Perfect, B00V4QR3MC, at £10.62. It is a 500 ml bloom liquid, 4.5 from 1,260 reviews, and the listing names hydroponics. That combination is the best value here: the cheapest bottle that is still a bloom-stage liquid with more than a thousand reviews. pH Perfect is the name of this bottle. The other bloom bottle is CANNA Bio Flores, B00DCX5VOC, at £14.63, 4.4 from 128 reviews, in a 1 litre pack. The listing asks if it is organic and does not print a certificate, so it is not an organic winner. Neither replaces a coco A and B set when the title you need says coco.
CANNA CANNA Coco A and B 1L set

Testsieger

CANNA CANNA Coco A and B 1L set
9.4/10about £17.56
View offer

Best-known flower booster

The flower booster with the largest review file is Advanced Nutrients Big Bud, B004TENZMI, at £12.25. It is 4.5 from 9,337 reviews. The title says 250 ml. It does not say coco. It is an extra on top of a feed, not the feed. If the title must say coco, skip this ASIN. The bloom booster or base fertiliser page keeps that role split in one place.

Who should skip the additives

Bud Candy, Sugar Shot and Trace Mix are the bottles to leave unless that extra is the job you already decided. Bud Candy, B003OTZ2PW, is £22.43, 4.7 from 2,844 reviews, a 1 litre carbohydrate booster. The star line is as high as the coco base. The role is not. Sugar Shot, B0BKWB3FQW, is £24.36, the highest price in the folder, at 4.4 from 127 reviews. Listing coco does not make it the coco base. Trace Mix, B0083G22QS, is £12.41, 4.5 from 53 reviews, a 1 litre trace supplement. The coco or soil page is the place to confirm the word on the title before you add any of these extras.

Common questions

Which listing is the coco base with the stronger review count?
B003VN7272, CANNA Coco A and B, at £17.56. It is 4.7 from 1,969 reviews, with a 1 litre volume field. The other A and B listing, B0090HMR9G, is 4.0 from 127 reviews at £19.49. The larger file is the coco base pick in this comparison, with the French-label note and the missing NPK still attached.
Which bottle is the lowest price in the folder?
Advanced Nutrients Bloom pH Perfect, B00V4QR3MC, at £10.62 for 500 ml. It is 4.5 from 1,260 reviews and the listing says hydroponics. It is the best value as a bloom liquid. It is not the coco A and B set, and the pH Perfect name does not apply to the Big Bud Coco listings.
Which Big Bud has 9,337 reviews, and what does that number not prove?
B004TENZMI, the 250 ml Big Bud that does not say coco, at £12.25. The 9,337 reviews are amazon.co.uk ratings. They do not prove a harvest weight, a potency change, or that the pack is 250 litres. The title contains that litre string, and the liquid-volume field says 240 ml.
Who should skip Sugar Shot?
Skip Xpert Nutrients Sugar Shot at £24.36 if you wanted a base feed, or if Bud Candy already covers a carbohydrate additive at £22.43 with 2,844 reviews against 127. Sugar Shot names soil, coco and hydroponics. That line does not turn a sugar liquid into CANNA Coco A and B.
Who should skip a booster if they have no base feed?
Anyone whose basket does not already contain a base. Big Bud, both Big Bud Coco ASINs and Bud Ignitor are extras. The bases in this folder are the two Coco A and B listings, Bloom pH Perfect and Bio Flores. A high review count on a booster does not fill that gap.
Is the 4.0-star Coco A+B the same as the 4.7-star set?
No. B0090HMR9G is a separate listing from B003VN7272, with a different price, a 4.0 rating from 127 reviews, a liquid-volume field of 2 litres against a 1L title, and a review that says the bottle is French only. Check the ASIN before you assume the pack and the language match the higher-rated set.
Can Bio Flores be called the organic winner?
No. CANNA Bio Flores at £14.63 uses a Bio name and the bullets mention hop extracts. The listing asks whether it is organic and does not print a certificate. Organic status stays unstated. It is the 1 litre flowering liquid beside the cheaper 500 ml Bloom bottle, not a certified-organic award.

Related pages

Cannabis fertiliser comparison

Cannabis fertiliser buying guide

Bloom booster or base fertiliser

Coco fertiliser or soil fertiliser

How to read a fertiliser label if the NPK is blank

Sources

Public UK and trade sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the eleven amazon.co.uk listings captured on 19 October 2026. There is no laboratory test and no harvest measurement. A Bio name is not an organic certificate. Buying a bottle does not make cannabis cultivation lawful.

  1. Misuse of Drugs Act 1971, section 6 (retrieved 19 October 2026)
  2. Misuse of Drugs Act 1971, Schedule 4 (retrieved 19 October 2026)
  3. Misuse of Drugs Regulations 2001, regulation 12 (retrieved 19 October 2026)
  4. GOV.UK, hemp licensing (retrieved 19 October 2026)
  5. GOV.UK, manufacturing and marketing fertilisers (retrieved 19 October 2026)
  6. Regulation (EC) No 2003/2003, Article 9 (retrieved 19 October 2026)
  7. Fertilisers Regulations 1991, Schedule 2 paragraph 6 (retrieved 19 October 2026)
  8. ASA CAP Code 3.7 (retrieved 19 October 2026)
  9. Greens Horticulture, nutrients for soil, coco and hydro (retrieved 19 October 2026)
  10. GroWell, how to choose nutrients (retrieved 19 October 2026)