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Best hydroponic fertiliser UK, matched to the system

Updated: October 2026

You want a bottle for the system you already run, and amazon.co.uk is happy to call several of them the best. This page stays on the eight listings in the [hydroponic fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/hydroponic-fertiliser) and says who each one is for, and who should skip it. There is no single best hydroponic fertiliser UK for coco, a recirculating tank, and a jar of LECA at once. The comparison marks CANNA Coco as the top pick on a tied 4.7 score because that listing is the coco nutrient, and Formulex 1 litre as best value at about £11.77. Scores are the star line times 20, not a laboratory trial. A qualifying purchase can earn a commission at no extra cost to you.

You want a bottle for the system you already run, and amazon.co.uk is happy to call several of them the best.

Our top picks

CANNA CANNA Coco A and B, 1 litre set

Best overall

CANNA CANNA Coco A and B, 1 litre set
9.4/10about £17.56
View offer
Growth Technology Growth Technology Formulex, 1 litre

Best value

Growth Technology Growth Technology Formulex, 1 litre
9.2/10about £11.77
View offer
CANNA CANNA Aqua Flores A and B, 1 litre

Alternative

CANNA CANNA Aqua Flores A and B, 1 litre
7.8/10about £23.01
View offer
On this page
  1. 1.Best for seedlings and a simple one-part feed
  2. 2.Best when the medium is coco
  3. 3.Best left for a recirculating bloom
  4. 4.What not to call the best

Best for seedlings and a simple one-part feed

Formulex 1 litre is the one-part mineral bottle for seedlings, a small kit, soil, or a foliar spray. It is about £11.77, 4.6 from 140 reviews, with 21 United Kingdom texts stored. The Amazon field is 1:99. Growth Technology's guide is a different string: 5 ml per litre for soil and foliar use, and 10 ml per litre for hydroponics. Stored notes include LECA, monstera, and chilli seedlings. The number-of-items field says 1000 against one bottle, while the unit count says 1000 millilitre. The 5 litre is the same formula at about £29.89, about £5.98 a litre if you finish it, 4.6 from 41 reviews, origin the United Kingdom. Buy it only after the 1 litre has suited you. The dose field is not a usable figure, and only six UK texts are stored. If you are still choosing the system, use the hydroponic fertiliser buying guide before you size up.

Best when the medium is coco

CANNA Coco A and B, about £17.56, is the match when the roots are in coir and you want one recipe for growth and bloom. The line is 4.7 from 1,969 reviews, with the first 50 United Kingdom texts stored. Those texts talk about coconut husk and a feed chart. One reviewer measured 5 ml of each part per litre. That is not the CANNA UK chart, which is 40 ml of A and 40 ml of B in 10 litres. The Amazon field only says 1:1. Two of the 50 texts found French on the B bottle. Skip this set for an NFT tank. The recirculating bloom bottle on this shelf is Aqua Flores, at about £23.01. A coco chart in a tank that returns the solution is the wrong saving.
CANNA CANNA Coco A and B, 1 litre set

Testsieger

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

Best left for a recirculating bloom

CANNA Aqua Flores A and B is about £23.01. The bullets name recirculating systems, flowering, and flavour, not seedlings. The line is 3.9 from 9 reviews, and the stored United Kingdom text is the word Good. There is no mixing-ratio field. CANNA UK states 30 ml of A and 30 ml of B in 10 litres, A stirred in before B, for NFT or ebb and flow in flower. The growth partner, Aqua Vega, is not in this folder. Take Aqua Flores when the tank and the flowering stage are already true.

What not to call the best

Fish-Mix has the largest review file, 4.7 from 2,059, at about £12.56. The first 50 UK texts are dominated by smell once a mix is left standing. The weight is 227 g against a 1 litre title, and the ratio field is 1:0. It can be the vegetative soil or coco feed if you mix only what you use immediately. The about £5.56 generic bottle has no review text and a unit count of 1.0 millilitre against 50 ml. Qzdtue at about £9.09 has a 1.0 score, a Chinese-only label, and 1 ml against 110 ml. Nouri at about £6.99 has no star line and a granule field on a 50 ml A and B title. Houseplant volume and smell are on the hydroponic fertiliser for houseplants page.

Common questions

Which kept bottle has the largest UK review file, and what does that not prove?
BioBizz Fish-Mix, at 4.7 from 2,059 reviews, has the largest count. CANNA Coco is close, at 4.7 from 1,969. That file shows use, and that a stored mix smells strongly. It is not a yield trial, and it is not a system match.
Who is Formulex 1 litre for, and who should buy the 5 litre instead?
The 1 litre at about £11.77 is a first one-part feed: seedlings, a small kit, soil, foliar spraying, or LECA, with the 1:99 field and 140 reviews. The 5 litre at about £29.89 is for someone who already uses that formula. Its dose field is not a usable figure.
When is CANNA Coco the match, and when is it the wrong saving?
It is the match in coir, at about £17.56 with 1,969 reviews, if you follow CANNA's chart for growth and bloom. It is the wrong saving in NFT or another returning tank, especially in flower. Aqua Flores names that job, at about £23.01, with nine reviews.
Why is Aqua Flores a weak best-overall even though the maker page is clear?
The maker page is clear about recirculating bloom. The Amazon listing is 3.9 from 9 reviews, one stored word, Good, and no mixing ratio. It can be the right label for that job. It cannot carry a best-overall claim for seedlings or coco.
Why do the about £5.56 and about £9.09 bottles fail a best-of test?
The generic 50 ml bottle is 4.0 with no review text, and the unit count says 1.0 millilitre. Qzdtue at about £9.09 has one review at 1.0, a Chinese-only label, and 1 ml against a 110 ml title. Skip both if you need a dose in English.
Is Fish-Mix a best hydroponic fertiliser or a vegetative soil and coco feed?
On this shelf it is the vegetative soil and coco feed. The highlight includes hydroponics, and the smell reviews point to a mix used straight away. The weight, 227 g, does not agree with the 1 litre title.

Related pages

How to mix hydroponic fertiliser

Hydroponic fertiliser

Hydroponic fertiliser buying guide for your system

Coco nutrients or recirculating hydroponic nutrients

Hydroponic fertiliser for houseplants in LECA or a jar

Sources

Public UK and maker sources used for this page in October 2026. Prices, stars and review counts are from the eight amazon.co.uk listings. Shelf date 21 October 2026. The card score is the star line times 20, not a laboratory test. No NPK is stated, because none of these listings print one. A fish-emulsion sheet is not a UK organic certificate.

  1. RHS, hydroponics (retrieved 21 October 2026)
  2. GOV.UK, manufacturing and marketing fertilisers (retrieved 21 October 2026)
  3. Fertilising Products Regulations 2020 (retrieved 21 October 2026)
  4. CANNA Aqua Flores (retrieved 21 October 2026)
  5. CANNA, ideal pH level (retrieved 21 October 2026)
  6. Growth Technology, the grower's guide (retrieved 21 October 2026)
  7. BioBizz Fish-Mix data sheet (retrieved 21 October 2026)
  8. amazon.co.uk, hydroponic nutrients best sellers (retrieved 20 October 2026)