The best guano fertilisers, compared.
Top pick: Guanokalong bat guano, 3 kg – Highest scaled score: 5.0 from 3 reviews becomes 100. One UK sentence is in the file. No NPK, dose or plant list on the listing. About £29.96. Best value: Flower guano sticks, 20 – Lowest snapshot price that still has a star line, about £5.97, 4.0 from 23. The 25 kg sack is cheaper per kilogram only with dry storage and a plot. Updated October 2026.
Guano fertiliser is a feed made from the excrement of bats or wild sea birds. GOV.UK uses that definition when it treats the material as an animal by-product. On amazon.co.uk the same words also cover powder, granules, a liquid and sticks, and some packs say guano without naming the animal. You buy it in the UK for a few pots, a palm or other houseplant, or a vegetable bed, when you want a phosphorus-leaning feed and you will read the pack for the analysis it actually prints. Powder or granules suit a mix or a tea. Sticks suit an insert. A liquid suits you when the bottle prints a mix you can follow. A large sack suits you when you have dry storage and a plot that will use it. Read whether the label says bat, seabird or neither, then the pack size, then whether a dose or an analysis is printed. A mixing field of all zeros is not a rate. Those checks are set out in the [guano fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/guano-fertiliser/sub/guano-fertiliser-buying-guide).
Guano fertiliser is a feed made from the excrement of bats or wild sea birds. GOV.UK uses that definition when it treats the material as an animal by-product.
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Personal buying guide
Question 1 of 2
Where will it go?
Guanokalong’s 3 kg pack is sold as bat guano at about £29.96, and that is almost all the saved listing gives you. The title says granular; the item-form line says powder, and the listing does not resolve it. There are no bullets, no NPK, no dose, and no plant list. Organic, indoor use, and which plants benefit are questions on the page, not answers. The star line is 5.0 from 3. One United Kingdom review says it will make fruit taste and smell better, and there is no criticism in that single text. About £10 per kilogramme by division sits between the VitaLink 3.5 kg snapshot and Flower’s 2 kg granules. The score of 100 is the 5.0 star line scaled up from three reviews, not a tested result, which is why the badge is a machine value on the highest score and not a UK award.
Pros
Cons
Best for: A shopper who already knows this brand and only needs the 3 kg bat-guano listing
Less suitable: Anyone who needs a printed analysis, a method, or a review sample larger than three
Specifications
Common questions
Is it powder or granules?
The title says Guanokalong Fertilizer Granular / Bat Guano (3 kg). The item-form line says powder. The saved listing does not resolve that.
Does the listing say it is organic, or name a dose?
Organic, indoor use, and which plants benefit are questions on the listing. There are no bullets, no NPK, and no dose.
What does the saved review say?
One UK review says it will make fruit taste and smell better. The star line is 5.0 from 3. There is no criticism in that single text.
This second VitaLink listing is another 3.5 kg bat-guano powder, at about £30.46, so it is the dearer twin of B01ARR7GVG rather than a second product family. The bullets say indoor and outdoor use in coco, compost, or soil, including seedbeds and lawns, and they describe the product as highly phosphorus. You can apply the powder on soil or mix it with water as a guano tea; no spoon rate is in the saved listing. The title’s 0.7 is not defined. The star line is 5.0 from 2, and the saved listing contains no review text, so praise and complaints are n/a. At about £30.46 you pay more than the about £26.25 tub that already has 517 United Kingdom reviews. The score of 100 is those two stars scaled up, not a reason to prefer this ASIN over the cheaper VitaLink listing.
Pros
Cons
Best for: Someone who specifically wants this ASIN’s indoor-and-outdoor tea wording and will still read the tub
Less suitable: Anyone who can buy the cheaper VitaLink 3.5 kg listing that already has UK review texts
Specifications
Common questions
What does the title’s 0.7 mean?
The title reads VitaLink Bat Guano 0.7 3.5 kg. The saved listing does not define 0.7. The unit count and item weight are both 3.5 kg.
Where can it be used?
The bullets say indoor and outdoor use in coco, compost, or soil, including seedbeds and lawns. Apply as powder or mix with water to make a guano tea. No spoon rate is in the saved listing.
What do reviewers say?
The star line is 5.0 from 2. The saved listing contains no review text, so praise and complaints are n/a
The CULTIVERS 1 kg granules sit at about £13.17 and name orchard and garden on the amazon.co.uk listing, with a bullet that claims a high NPK without printing nitrogen, phosphorus, or potassium figures. Indoor use is not answered. The star line is 4.8 from 8. Three saved texts are from Spain and mention happier plants, easy application, and no smell; there is no repeated defect in those texts. One bullet says the product is harmless for animals and plants, while a separate pet-safety question on the page is not answered as its own line. At one kilogramme the pack is a mid-price bag rather than a plot sack, though you still have no numeric analysis and no United Kingdom review sample. The score of 96 is the 4.8 star line scaled up from eight reviews.
Pros
Cons
Best for: A small orchard or garden bed when 1 kg is enough and you can live without a printed NPK
Less suitable: Pots that need a stick, a vegetable listing that says vegetables, or UK review texts
Specifications
Common questions
Is a number given for the NPK?
No. The bullet says a high concentration of NPK, organic matter, and humic substances. It does not print nitrogen, phosphorus, or potassium figures.
What does the listing say about pets?
One bullet says the product is harmless for animals and plants. The question “is this fertiliser safe for pets?” is on the listing and is not answered as a separate line.
What do the saved reviews say?
Three texts are from Spain. They mention happier plants, easy application, and no smell. There is no repeated defect in those texts. The star line is 4.8 from 8.
VitaLink’s 3.5 kg tub is bat-guano powder at about £26.25, described as a soil builder and compost activator, and it is the only pack in this set with a large United Kingdom review sample. The star line is 4.6 from 517, and fifty saved texts are from the UK. Reviewers repeat faster or healthier growth on tomatoes, chillies, and other plants, stronger roots, and repeat buys. They top-dress or mix a paste; the bullets do not print a spoon rate, and indoor use is not answered there. Smell reports disagree: some find little smell when the powder is dry, one reports ammonia when mixing a paste, and one reports a smell in a grow room after top dressing. Complaints in the sample also include a missing scoop, hard lumps in one tub, price, and one order that did not arrive. The specification table has no NPK; one UK review states 3-10-1, which is a review, not a technical-details line. About £7.50 per kilogramme is arithmetic on the snapshot, not a live unit price.
Pros
Cons
Best for: Someone who wants a measured bat-guano powder and will read UK reviews before they mix it
Less suitable: A palm that only needs a stick, a buyer who will not store 3.5 kg, or anyone who needs a printed NPK
Specifications
Common questions
Does the listing state an NPK?
The specification table does not. One UK reviewer writes that the NPK is 3-10-1. That figure is a review, not a technical-details line.
Can it be used indoors, and does it smell?
Both questions are on the listing and are not answered in the bullets. UK reviews disagree: some report little smell when the powder is dry, one reports ammonia when mixing a paste, and one reports a smell in a grow room after top dressing.
What do UK reviewers repeat?
Faster or healthier growth on tomatoes, chillies, and other plants, stronger roots, and repeat buys. Complaints in the sample are smell while mixing, a missing scoop, hard lumps in one tub, price, and one order that did not arrive. The star line is 4.6 from 517.
COMPO’s 30-stick pack is the only listing in this set that names seabird guano, and the bullets point it at green plants, palms, ferns, and pond plants for up to three months from March to October. You push a stick into a hole 5–6 cm from the stem, use the number on the back of the pack, and cover it; English on that pack is not guaranteed. The star line is 4.5 from 2,853. None of the 50 saved texts is from the United Kingdom, so that count is not UK opinion. Reviewers describe easy insertion and the three-month interval; some report a damaged blister and missing sticks, and one says the pack dose did not match a dose they had seen elsewhere. Country of origin is Germany. The mixing field reads 11:4:8 and is not printed as an NPK analysis in the saved listing. At about £15.78 it is a mid-price insert, not a tub of bat powder.
Pros
Cons
Best for: Palms, ferns, pond plants, or other green plants when you want a three-month seabird stick
Less suitable: A vegetable plot, a buyer who needs UK review texts, or anyone who wanted a tub of bat powder
Specifications
Common questions
How do you insert the sticks?
The bullets say to use the number on the back of the pack, push a stick into a hole 5–6 cm from the stem, and cover it. English on the pack is not guaranteed. Replace every three months from March to October.
Is this pure bat guano?
No. The title is green plant and palm fertiliser sticks with guano. The bullet says natural seabird guano. It is a stick feed, not a tub of bat powder.
What do the saved reviews report?
None of the 50 saved texts is from the United Kingdom. Reviewers describe easy insertion and a three-month interval. Some report a damaged blister and missing sticks, and one says the pack dose did not match a dose they had seen elsewhere. The star line is 4.5 from 2,853.
Flower’s 2 kg granules are about £28.53 on the snapshot and tell you to incorporate the product into the ground, with a bullet that 2 kg equals 40 m². The included-components line reads NPK fertilizer 3 - 1,5 - 1,5, while the mixing-ratio field is 1:0:0 and is not a dose. Stated plants are roses, hydrangeas, phalaenopsis, and acid plants, not a vegetable plot. Bat or seabird is not stated, and indoor use is unanswered. The star line is 4.5 from 106. None of the 25 saved texts is from the United Kingdom; reviewers mention tomatoes, vegetables, colour, and flowers, and one says 2 kg is not much for a vegetable plot. No repeated defect appears in that sample. About £14 per kilogramme by division makes this the dearest granules-per-kilo pack in the set.
Pros
Cons
Best for: An ornamental bed where 40 m² and a 3-1.5-1.5 line are the figures you wanted
Less suitable: A vegetable listing, a named animal, or a cheaper-per-kilo sack
Specifications
Common questions
What NPK does the listing print?
The included-components line reads NPK fertilizer 3 - 1,5 - 1,5. The mixing-ratio field is 1:0:0, which is not a usable dose. Bat or seabird is not stated.
How much ground does 2 kg cover?
The bullet says 2 kg = 40 m² and the application method is to incorporate it into the ground. Indoor use and a use-by date are questions on the listing with no bullet answer.
What do the saved reviews say?
None of the 25 saved texts is from the United Kingdom. Reviewers mention tomatoes, vegetables, colour, and flowers. One says 2 kg is not much for a vegetable plot. No repeated defect appears in the sample. The star line is 4.5 from 106.
The CULTIVERS 25 kg sack is the only listing in this set that names a vegetable garden, at about £50.31, which is about £2 per kilogramme by division of the snapshot. The form is powder. High NPK is claimed with no numbers, and the mixing field reads 1:1:1, which is not an analysis. The animal is not stated, and indoor use is unanswered. The star line is 4.4 from 65. Twenty-one saved texts are from Spain and France, not the United Kingdom. Several mention a strong or sea-like smell; others say the grains barely smell. Reviewers also report repeat buys for fruit trees and vegetable plots, and one says fine grain acts faster than coarser manure, which is a review, not a bullet. You need dry storage and a plot; a few pots will not finish 25 kg.
Pros
Cons
Best for: A vegetable or fruit plot with dry storage when 25 kg is the size you can use
Less suitable: Houseplants, a buyer who needs a named animal or a printed NPK, or anyone without space for a sack
Specifications
Common questions
Is this a fast-acting fertiliser?
The listing asks that and does not answer it. The item form is powder. Reviews describe fine grains. One review says fine grain acts faster than coarser manure. That is a review, not a bullet.
Can it be used indoors?
Indoor use is an unanswered question. The listing names a vegetable garden and garden plants.
What do the saved reviews say about smell?
Texts are from Spain and France, not the United Kingdom. Several mention a strong or sea-like smell. Others say the grains barely smell. Reviewers also report repeat buys for fruit trees and vegetable plots. The star line is 4.4 from 65.
The Flower blister puts 20 guano sticks on the amazon.co.uk listing at about £5.97 and names flowers as the target, without a replacement interval or a stick count per pot in the bullets. The mixing-ratio field reads 1:0:0, which is not a usable rate, and indoor use is an unanswered listing question. The star line is 4.0 from 23. The seven saved texts are from Spain and describe sticks that snap, packs that arrived already broken or short, one pack that did not match the photo, and one pack dated 2022. That sample is not United Kingdom opinion, and the listing never says bat or seabird. At this price it is the cheapest pack in the set with a star line, though you still have no dose until you read the blister itself. The score of 80 is the 4.0 star line scaled up, not a trial of how long a stick lasts in a pot.
Pros
Cons
Best for: A few flower pots when you will accept a cheap stick blister without a printed dose
Less suitable: Anyone who needs a named animal, a UK review sample, or a rate before they buy
Specifications
Common questions
How often do you replace these sticks?
The listing asks how often to apply and does not answer it. There is no dose in the bullets. The mixing-ratio field reads 1:0:0, which is not a usable rate.
Can they be used indoors?
Indoor use is one of the unanswered questions on the listing. The target-species line says flowers.
What do the saved reviews say about the sticks?
Seven texts are from Spain. Reviewers describe sticks that snap, packs that arrived already broken or short, one pack that did not match the photo, and one pack dated 2022. The star line is 4.0 from 23.
Fertiberia’s 1 L bottle is sold as liquid guano at about £8.49, and the bullets claim leaf growth, flowers, and results in one week without naming a plant list or an analysis. The saved listing prints a mixing ratio of 1:3 and does not say whether that is fertiliser to water or which crop it is for. There is no customer-review line and no review text, so the score of 0 records that gap rather than a poor rating. Bat or seabird is not stated, and indoor use is not answered. At this size it is an entry-price liquid in the set, though you still have no verified rate and no UK shopper sample to weigh against the week-one claim. The listing is thinner than the powder tubs and the COMPO sticks on every check that is not volume.
Pros
Cons
Best for: A buyer who already wants a litre of liquid and will read the bottle before mixing
Less suitable: Anyone who needs a star rating, a named animal, or a complete dose
Specifications
Common questions
Does the listing say bat or seabird guano?
It does not. The title is Liquid Fertiliser Guano Fertiberia 1 L. The bullets claim leaf growth, flowers, and results in one week, with no analysis and no plant list.
What is the mixing figure?
The saved listing prints a mixing ratio of 1:3. It does not say whether that is fertiliser to water, and it does not name a crop.
Are there reviews in the saved listing?
No. There is no customer-review line and no review text.
Nine amazon.co.uk listings were scored as the star rating multiplied by 20. A listing with no star line scores 0. There is no laboratory test. Review counts stay beside the stars. No extra deduction was applied. A score of 100 from two or three reviews is that star line scaled up, not a UK trial. The top pick is the highest of those scores: Guanokalong at 5.0 from 3. The best value is the lowest shelf price that still has a star line, the 20-stick blister at about £5.97. The 25 kg sack is cheaper per kilogram only with dry storage and a plot. Prices are the snapshot in the saved files, not a live scrape. The weights below sum to 100 and split the written checks. They did not change the star score.
Form and job
25%Powder or granules if you will mix or make a tea. Sticks if you want an insert. A liquid only when the listing is thin and you will read the bottle. A 25 kg sack only with dry storage and a plot. The number on the card is still the star line times 20.
Animal on the label
20%Bat is stated for VitaLink and Guanokalong. Seabird is stated for the COMPO sticks. Flower, CULTIVERS and Fertiberia say guano without naming the animal in the saved bullets. The source column did not change the star score.
Pack against the job
15%The 2 kg granules claim 2 kg equals 40 m². COMPO is 30 sticks. The bat tubs are about 3 to 3.5 kg. CULTIVERS is 1 kg or 25 kg. A few pots do not finish 25 kg.
Declared analysis
20%Prefer a readable NPK or a plant list over 100% organic with no certifier. Ignore a mixing field of 1:0:0. A results-in-one-week line is a seller claim. VitaLink’s 3-10-1 appears in one UK review, not on the specification table.
Where the reviews were written
20%Prefer texts marked Reviewed in the United Kingdom. COMPO at 4.5 from 2,853 and the Flower 2 kg pack at 4.5 from 106 are large counts whose saved texts are not from the UK. A 5.0 from two or three reviews is the star line scaled up. Counts were not used as a deduction.
Match the form, the animal on the label and the pack size before you match the star line. Prices below are the amazon.co.uk snapshot in the saved files. This is not a laboratory test.
Guano, on GOV.UK, is excrement from bats or wild sea birds. On amazon.co.uk the same word covers bat-guano powder, granules, a liquid, sticks that name seabird guano, and a large sack. You usually want a phosphorus-leaning feed for pots or vegetables, or a stick for a palm or houseplant. Judge a pack by its form, whether the label says bat, seabird or neither, the pack size, and a dose printed on that pack. Most of these listings have no numeric NPK.
The COMPO sticks name seabird guano and a three-month insert for green plants, palms, ferns and pond plants. They are not a tub of bat powder.
UK retailer pages for Guanokalong do not match each other. A figure on Hyjo or GroWorks is not a dose for VitaLink, Flower or CULTIVERS. Use the pack in your hand.
COMPO’s 4.5 from 2,853 and the Flower 2 kg pack’s 4.5 from 106 are large counts. The saved texts for those listings are not from the United Kingdom.
A mixing field of 1:0:0 is not an analysis. A 100% organic line on these listings names no control body and is not a certificate.
Decide the job before the brand. Powder or granules are for mixing or a tea. Sticks are an insert, and only a printed interval tells you when to replace them. The COMPO sticks say up to three months, from March to October, pushed 5–6 cm from the stem. A liquid is worth buying when you can follow the mix on the bottle. Fertiberia prints 1:3 and does not say which part is water or name a crop. A 25 kg sack needs dry storage and a plot. Then read the animal. VitaLink and Guanokalong say bat.
A readable NPK or a plant list beats a slogan. The Flower 2 kg components line prints 3-1.5-1.5 and names roses, hydrangeas, phalaenopsis and acid plants. CULTIVERS claims a high NPK and prints no numbers. VitaLink’s table has no NPK. One UK review states 3-10-1, which stays a review. Ignore 1:0:0. Ignore a results-in-one-week claim as a measured result. Then check where the reviews were written. VitaLink 3.5 kg at about £26.25 has 4.6 from 517 with saved United Kingdom texts.
Three typical situations, each with a recommendation from this comparison.
You have a handful of pots and you want a small blister. Flower guano sticks, 20, are about £5.97, the lowest snapshot price that still has a star line: 4.0 from 23. The saved texts are from Spain and describe broken or short packs. Flowers are the stated target, and the bullets do not print a dose.
You already use organic manures and you can store a sack that a few pots will not finish. CULTIVERS guano, 25 kg, is about £50.31 and names a vegetable garden. High NPK is claimed with no numbers, the animal is not stated, and the saved texts are from Spain and France. About £2 per kilogram is division of that snapshot.
You want the label to say bat, and you want review texts from the United Kingdom before you mix. VitaLink bat guano, 3.5 kg, is about £26.25, with 4.6 from 517 and UK texts in the file. The specification table has no NPK, the bullets have no spoon rate, and smell reports in that sample disagree. The dearer 3.5 kg listing has no review text.
The top pick is Guanokalong bat guano, 3 kg, at about £29.96. amazon.co.uk shows 5.0 from 3 reviews, so the scaled score is 100, the highest in the set. One UK review says fruit will taste and smell better. The title says granular and the item-form line says powder. There are no bullets, no NPK, no dose and no plant list. The same scaled score of 100 sits on the dearer VitaLink 3.5 kg listing, which has 5.0 from 2 and no review text, so that listing takes no badge. The best value is Flower guano sticks, 20, at about £5.97, the lowest snapshot price with a star line, 4.0 from 23. Flowers are named. The saved texts are from Spain and describe broken or short packs, and the bullets print no dose. None of these scores is a laboratory test.
Guanokalong bat guano, 3 kg
Highest scaled score: 5.0 from 3 reviews becomes 100. One UK sentence is in the file. No NPK, dose or plant list on the listing. About £29.96.
Flower guano sticks, 20
Lowest snapshot price that still has a star line, about £5.97, 4.0 from 23. The 25 kg sack is cheaper per kilogram only with dry storage and a plot.
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 sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the nine amazon.co.uk listings in the saved files. A 100% organic line names no certifier. A star count whose saved texts are not from the United Kingdom is not UK opinion. This is not a laboratory test. Do not collect droppings from a bat roost.
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.
