The best cannabis fertilisers, compared.
Top pick: Advanced Nutrients Bud Candy 1 litre Best value: Advanced Nutrients Bloom pH Perfect 500 ml – Lowest shelf price that is still a bloom liquid, about £10.62, with 4.5 from 1,260 reviews. Updated October 2026.
Cannabis fertiliser is a bottled liquid nutrient sold on amazon.co.uk in the hydroponic aisle. You buy it when you already run coco or hydroponics, or when you use the same style of feed on flowers, fruit and herbs. Match the job and the medium on the title. A two-part base or a bloom liquid is a main feed. A flower booster, a carbohydrate additive and a trace mix are extras, and an extra does not replace a base. Check the pack next. Titles and volume fields do not always agree, so keep both figures. Where UK fertiliser rules apply, the label is expected to show N, P2O5 and K2O. If the amazon table does not print them, the analysis is unknown. A mixing ratio is not that panel. Cultivating cannabis is unlawful in the UK without a Home Office licence. Buying a bottle does not change that. Which job to buy first is set out in the [cannabis fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/cannabis-fertiliser/sub/cannabis-fertiliser-buying-guide).
Cannabis fertiliser is a bottled liquid nutrient sold on amazon.co.uk in the hydroponic aisle. You buy it when you already run coco or hydroponics, or when you use the same style of feed on flowers, fruit and herbs.
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Personal buying guide
Question 1 of 2
What job is this bottle?
Advanced Nutrients Bud Candy is a 1 litre carbohydrate booster at £22.43, rated 4.7 from 2,844 reviews. The listing describes stored carbohydrates and points it at vegetables, flowers and indoor plants. It does not print an NPK, so it is not shown as a base feed. Reviewers talk about the taste and smell of fruit and flowers, about easy mixing, and about a price some still call high. The unit count is 1,000 ml and the liquid-volume field says 34 fluid ounces. Item weight is 1.1 kg and the model number is 2320-14. It ranks 9,370 in Garden and 27 in Hydroponic Nutrients & Additives. The score matches the coco base because of the star line and the review count. The role does not: it is an additive you buy after a base, not instead of one.
Pros
Cons
Best for: You already own a base feed and you want the carbohydrate bottle with the larger review file.
Less suitable: You have not chosen a base, or you expected an NPK fertiliser.
Specifications
Common questions
Is Bud Candy a complete fertiliser?
The listing describes stored carbohydrates and a booster. It does not print an NPK, so it is not shown as a base feed.
What pack is on the title?
1 litre. The unit count is 1,000 ml and the liquid-volume field says 34 fl oz.
What do reviews repeat?
Taste and smell of fruit and flowers, easy mixing, and a price that some buyers still call high.
CANNA Coco A and B is a two-bottle coco base at £17.56, rated 4.7 from 1,969 reviews. The liquid-volume field says 1 litre, the mixing-ratio field says 1:1, and the item weight is 998 g. It is listed for both growing and flowering on coco, which makes it a base feed rather than a single booster. Reviewers say a pH meter is still necessary. One reviewer says the instructions on the B bottle are in French. It ranks 3,346 in Garden and 5 in Hydroponic Nutrients & Additives. The Amazon table still has no NPK. It is the top pick in this set because it is a complete two-part coco base with the stronger of the two A and B ratings, not because a lab measured a harvest.
Pros
Cons
Best for: You want the coco A and B set with the larger review file and a 1 litre volume field that matches the title.
Less suitable: You need a printed NPK, a guarantee of English-only text, or a bottle that is only a flower booster.
Specifications
Common questions
Why are there two bottles?
The listing is an A and B set for coco, for both growing and flowering. It is a base feed, not a single booster.
Do reviews say you can skip a pH meter?
No. Reviewers say a pH meter is necessary.
Is the label language mentioned?
One reviewer says the instructions on the B bottle are in French.
Advanced Nutrients Bud Ignitor is a 0.25 litre liquid at £20.64, named for the flowering stage, with 4.6 from 1,307 reviews. Country of origin is United Kingdom and the item weight is 249 g. The liquid-volume field says 8.5 fluid ounces, which is a second unit beside the 0.25 litre title. The listing asks if it is organic and does not print an answer. A mixing-ratio field of 1:0:0 is not a verified analysis, and NPK is absent. No medium is named. At more than £20 for a quarter-litre, it is a flowering-stage booster with a solid review file. It does not replace CANNA Coco A and B or the 500 ml Bloom bottle.
Pros
Cons
Best for: You already have a base and you want this flowering-stage name with a four-figure review count.
Less suitable: This would be the only bottle in the order, or you need a 1 litre base at a lower price.
Specifications
Common questions
What stage does the listing name?
Specific uses say flowering stage. The pack is 0.25 litre.
Is it labelled organic?
The listing asks and does not print an answer. Organic status is not stated
Does the file contain an NPK?
No. A mixing-ratio field prints 1:0:0 and is not a verified analysis.
Advanced Nutrients Big Bud Coco on this ASIN is listed at £13.42 with 4.6 from 692 reviews. The title and the included-components line say 250 ml, while the unit count says 8.45 millilitres and the liquid-volume field says 8.45 fl oz, so three figures sit on one page. Reviewers say this bottle is not a pH Perfect product and that it moved the pH. Reviews also describe a mouldy or broken seal, an unsealed bottle, and leaks. The bullets say coco coir and also soil or hydroponics. Item weight is 308 g and the model number is 5070-12. There is no NPK in the Amazon table. It is the coco booster with the larger review sample, provided you treat the volume clash and the seal notes as part of the purchase.
Pros
Cons
Best for: You want Big Bud with coco in the title and the larger of the two coco review files.
Less suitable: You need one agreed pack size, a pH Perfect bloom base, or a file with no seal complaints.
Specifications
Common questions
Which volume figure should you trust?
The title and the included-components line say 250 ml. The unit count says 8.45 millilitres and the liquid volume says 8.45 fl oz. The file does not reconcile them.
Do reviews call this pH Perfect?
No. Reviewers say this bottle is not a pH Perfect product and that it moved the pH.
What seal problems are in the reviews?
Reviews describe a mouldy or broken seal, an unsealed bottle, and leaks.
Advanced Nutrients Big Bud is a 250 ml flower-booster liquid at £12.25, with 4.5 from 9,337 amazon.co.uk reviews, the largest review file in this set. The title also contains the text 250 litres, while the unit count is 250 ml and the liquid-volume field says 240 ml, so the pack is not a single agreed figure. The listing does not say coco and does not print an NPK or a medium. Item weight is 295 g and the model number is 5050-12. It ranks 5,290 in Garden and 11 in Hydroponic Nutrients & Additives. That review count shows how often the listing is bought and rated, not a measured harvest. Buy it as a booster only if a base feed is already the bottle you have chosen, and check the millilitre line before you rely on the pack size.
Pros
Cons
Best for: You want the Big Bud listing with the largest review file and you do not need the word coco on the title.
Less suitable: You need a coco label, a 1 litre base, or one volume figure the table agrees on.
Specifications
Common questions
Is the pack 250 ml or 250 litres?
The title says 250 ml and also contains the text 250 litres. The unit count is 250 ml and the liquid-volume field is 240 ml. Both conflicts are left as printed.
Is this the coco version?
No. This ASIN does not say coco. Big Bud Coco is B00V4QS74K and B07D3ZGPY6.
Does the listing print an NPK?
No. NPK is not stated on this file.
The Advanced Nutrients Bloom pH Perfect bottle is a 500 ml bloom-stage liquid listed for hydroponics at £10.62. It is 4.5 from 1,260 amazon.co.uk reviews, and the name pH Perfect belongs to this bottle rather than to every Advanced Nutrients product in the set. The technical table does not print nitrogen, phosphorus or potassium, so you cannot compare an analysis from the page itself. A mixing-ratio field reads 1:1:1 and the item weight is 597 g, with model number 1201-13. It sits at 48,155 in Garden and 114 in Flower Fertilisers. At the lowest shelf price in this comparison, with a four-figure review count, it is the best value when you already want a bloom liquid and can accept a missing nutrient line. It is not a two-part coco set, and it is not a flower booster.
Pros
Cons
Best for: You want the cheapest bloom liquid in this comparison and the listing already says hydroponics.
Less suitable: You need a printed NPK, a coco A and B set, or a booster labelled coco.
Specifications
Common questions
Does this listing state an NPK?
No. The technical table has no nitrogen, phosphorus or potassium figure, so the comparison leaves the analysis blank
What medium does the listing name?
Specific uses say hydroponics. The title says Bloom and the pack is 500 ml.
Is pH Perfect a claim on every Advanced Nutrients bottle here?
No. It is the name of this 500 ml bottle. The Big Bud Coco reviews say that coco bottle is not pH Perfect.
CANNA Trace Mix is a 1 litre liquid at £12.41, listed as a supplementary mineral fertiliser for a trace-element gap rather than a complete base. It is 4.5 from 53 amazon.co.uk reviews. The only United Kingdom review in the file mentions a slight leak from a faulty seal and says the leak was not serious. The technical table does not give N, P2O5 or K2O. Item weight is 1 kg, the manufacturer line says Hydrogarden, and a mixing-ratio field prints 1-2 ml/L, which stays a listing field rather than a plan. It ranks 173,631 in Garden and 216 in Tree & Shrub Fertilisers, far from the hydroponic ranks of the base feeds. It is a top-up if a base is already in the basket, and a weak substitute for CANNA Coco A and B.
Pros
Cons
Best for: You already have a base feed and you want the trace bottle in this folder.
Less suitable: This is the first bottle in the order and you expected a complete nutrient.
Specifications
Common questions
Is Trace Mix a complete fertiliser?
The bullets call it a supplementary mineral fertiliser for a trace-element gap. It is not described as a full base feed.
What do the UK reviews say about the seal?
The only UK review in the file mentions a slight leak from a faulty seal and says it was not serious.
Is an NPK printed?
No. The technical table does not give N, P2O5 or K2O.
CANNA Bio Flores is a 1 litre flowering liquid at £14.63, rated 4.4 from 128 reviews. The bullets name hop extracts and minerals in natural proportions, and the coverage line says plants in bloom. The listing asks whether it is organic and does not print a certificate, so organic status stays unstated. A mixing-ratio field of 1:0:0 is not an NPK panel, and the technical table does not give N, P2O5 or K2O. Item weight is 1.39 kg and the manufacturer is Hydrogarden. The medium note mentions soil nutrient retention and does not say coco. It is the other bloom bottle beside the cheaper pH Perfect liquid, useful if you want a 1 litre CANNA flowering name and you will not treat Bio as a certificate.
Pros
Cons
Best for: You want a 1 litre CANNA bottle aimed at the flowering phase and you can accept an unstated organic status.
Less suitable: You need a coco A and B set, a printed organic certificate, or the lowest price in the folder.
Specifications
Common questions
Is Bio Flores certified organic on this listing?
The listing asks the question and does not print a certificate. The bullets name hop extracts and minerals in natural proportions.
What stage does the listing name?
Coverage says plants in bloom, and the bullets say the flowering phase.
Is an NPK printed?
No. A mixing-ratio field prints 1:0:0 and is not treated as an NPK panel.
Xpert Nutrients Sugar Shot is a 1 litre carbohydrate bloom stimulator at £24.36, the highest price in this folder, rated 4.4 from 127 reviews. The bullets describe carbohydrates, sugar and microbes, and they name soil, coco substrates and hydroponics. Naming three media does not turn it into a coco base. There is no NPK. Item weight is 1.2 kg, country of origin is given as España, and the liquid-volume field says 1 litre, which matches the title. It ranks 46,362 in Garden and 147 in Hydroponic Nutrients & Additives. Beside Bud Candy it is the smaller review file at a higher price, so it is the additive to leave unless you specifically want this brand.
Pros
Cons
Best for: You want this brand’s carbohydrate bottle and you already have a base feed.
Less suitable: You want the cheaper, more-reviewed carbohydrate listing, or any complete base.
Specifications
Common questions
Is Sugar Shot a full feed?
The bullets describe carbohydrates, sugar and microbes. They do not state an NPK. It is an additive.
Which media does the listing name?
Soil, coco substrates and hydroponics.
What is the pack and price on this file?
1 litre at £24.36, with 4.4 from 127 reviews.
This Advanced Nutrients Big Bud Coco listing is a 250 ml flower booster at £12.50, rated 4.3 from 65 reviews. It is a different ASIN from B00V4QS74K even though both titles say Big Bud Coco 250 ml. The title and specific uses say coco, while the bullets also say soil or hydroponics, so the medium line is wider than the product name. The liquid-volume field says 250 millilitres, which agrees with the title, and the item weight is 430 g. A mixing-ratio field prints 1:72 to 1:144. There is no NPK. The part-number field reads RinTalen, which does not match the Advanced Nutrients model style on the other Big Bud rows. The smaller review file and the extra medium wording are the reasons to open the other coco ASIN before you rely on this one.
Pros
Cons
Best for: You want a coco-labelled Big Bud and you have compared this ASIN with B00V4QS74K.
Less suitable: You want the larger coco review file, or a two-part coco base.
Specifications
Common questions
Is this the same listing as Big Bud Coco B00V4QS74K?
No. Both titles say Big Bud Coco 250 ml, but the ASINs, prices and review counts differ.
What medium is named?
The title and specific uses say coco. The bullets also say soil or hydroponics.
Does the listing print an NPK?
No. NPK is not stated
This second CANNA Coco A+B listing is £19.49 and 4.0 from 127 reviews, a different offer from B003VN7272. The title and the unit count say 1 litre, the liquid-volume field says 2 litres, and the item weight is 2.48 kg, so the pack is not settled. A UK review says there is not a word of English on the bottle and that the text is French. The model field reads croissance et floraison. A mixing-ratio field of 4:4:1 is left as a raw field, not an adopted NPK, and the table does not print N, P2O5 or K2O. It is still an A and B coco base. It is the listing to leave if you wanted the 4.7-star set with a matching 1 litre line.
Pros
Cons
Best for: You have a reason to use this specific ASIN and you will check the litre field and the label language on arrival.
Less suitable: You want the higher-rated coco set, or you need the instructions in English.
Specifications
Common questions
Is this the same offer as B003VN7272?
No. It is another Canna Coco A and B listing, with a different price, rating and pack fields.
What pack size is printed?
The title and unit count say 1 litre. The liquid-volume field says 2 litres and the item weight is 2.48 kg.
What language is on the bottle, according to reviews?
A UK review says there is not a word of English on the bottle and that the text is French.
Eleven amazon.co.uk listings were scored from the stored pages and the UK review notes already on file. Shelf date 19 October 2026. There is no laboratory test and no harvest measurement. No kept listing prints N, P2O5 and K2O in the technical table, so a missing analysis adds nothing and an invented NPK is not scored. A coco title is not given the score of a bottle that does not say coco. Where two pack fields disagree, both stay and the clash is a deduction. The top pick is the complete coco base when that listing shares the highest score with an additive. The best value is the lowest shelf price that is still a bloom liquid, with 4.5 stars and more than 1,000 reviews. The weights below sum to 100.
Amazon evidence
30%Star rating on amazon.co.uk, then the size of that listing's review file. A 4.7 from 1,969 reviews outranks a 4.0 from 127 reviews on the same product type. A review file under 100 is a deduction.
Role
25%A two-part coco base or a bloom liquid is scored as a main feed. A flower booster, a carbohydrate additive and a trace mix are scored as extras, not as substitutes for a base.
Medium
20%The medium named on the title is scored. A coco title is not given the score of a non-coco twin. A bullet that also says soil or hydroponics does not erase the word coco.
Pack fields
15%Pack fields that agree score higher. A second volume that conflicts with the title is a deduction, as is a French-only label note or a seal or leak note. A mixing-ratio field that is not an NPK is not treated as an analysis.
Value
10%Price is judged inside this set only. A bottle on another shop is not an extra row. The best value is the lowest shelf price that is still a bloom liquid.
Buy the job before you buy the star line. A coco base, a bloom liquid, a flower booster, a carbohydrate additive and a trace mix are not one list. Prices below are amazon.co.uk shelf prices on 19 October 2026. This is not a laboratory test and not a cultivation guide.
Cannabis fertiliser on amazon.co.uk, among the bottles kept for this comparison, means a liquid from the hydroponic aisle. You already run coco or hydroponics, or you use the same brands on flowers, fruit and herbs. The useful check is the job on the label. A high star line is not a harvest measurement, and it does not turn a booster into a base. Five jobs sit in the set. A two-part coco base is CANNA Coco A and B, sold as two different listings.
Bud Candy and Sugar Shot are carbohydrate additives. Trace Mix fills a trace gap. None of them is a two-part base or a bloom liquid.
A coco formula is a different purchase from a bottle that does not say coco. Bullets that also name soil or hydroponics do not erase the word on the title.
Some listings print a second figure, including 250 litres, 240 ml, 8.45 fl oz or 2 litres, beside the title. Keep both. Do not invent a single size.
Name the job before the star line. A two-part coco base and a bloom liquid are main feeds. CANNA Coco A and B is the base in this set. Bloom pH Perfect and Bio Flores are the bloom liquids. Big Bud, Big Bud Coco and Bud Ignitor are flower boosters. Bud Candy and Sugar Shot are carbohydrate additives. Trace Mix is a trace top-up. An extra does not stand in for a base, however many reviews the listing has. The medium on the title is the next split.
Pack fields have to agree before you trust a size. The title, the unit count and the liquid-volume field stay as printed. A clash is a deduction, not a figure to smooth over. Big Bud's title says 250 ml and also contains 250 litres, while a volume field says 240 ml. One Big Bud Coco title says 250 ml beside 8.45 millilitres and 8.45 fl oz. The second Coco A and B listing says 1 litre on the title and 2 litres in the volume field. A quarter-litre booster is not a one-litre base.
Three typical situations, each with a recommendation from this comparison.
You already run coco or hydroponics and you are choosing a booster or an additive, not a second base. Advanced Nutrients Bud Candy is about £22.43, with 4.7 from 2,844 reviews. It is a carbohydrate additive. The listing does not print an NPK, so it does not replace the base you already own.
You use these brands on flowers, fruit and herbs rather than as a coco set. Advanced Nutrients Big Bud is about £12.25, with 4.5 from 9,337 reviews, the largest file in the set. The title does not say coco, and it also prints 250 litres beside 250 ml. Check the millilitre line before you rely on the pack.
You are about to treat a sugar additive, a trace mix and a two-part base as the same purchase. If the medium you need is coco, start with CANNA Coco A and B at about £17.56, 4.7 from 1,969 reviews. That is the top pick. Bud Candy, Sugar Shot and Trace Mix do not replace it.
The top pick is CANNA Coco A and B 1L set at about £17.56. It shares a score of 94 with Bud Candy, and the complete coco base takes it rather than the carbohydrate additive at about £22.43. amazon.co.uk shows 4.7 from 1,969 reviews, and the liquid-volume field says 1 litre. The best value is Advanced Nutrients Bloom pH Perfect 500 ml at about £10.62, the lowest shelf price that is still a bloom liquid, with 4.5 from 1,260 reviews. None of these scores is a laboratory harvest test, and no listing here prints an NPK.
Advanced Nutrients Bloom pH Perfect 500 ml
Lowest shelf price that is still a bloom liquid, about £10.62, with 4.5 from 1,260 reviews.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
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.
Expert source (DIY & tools): Lee Burkhill (Garden Ninja) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
