The best cactus fertilisers, compared.
Top pick: COMPO cactus fertiliser, 250 ml Best value: FITO cactus drip feeder, 32 ml – Lowest shelf price in this set, about £3.61, ready to use with a listing claim of up to 15 days and 4.4 from 100 reviews. Updated October 2026.
A cactus fertiliser is plant food for cacti and usually other succulents, sold on amazon.co.uk as a dilute liquid, a ready-to-use drip or spray, slow-release granules, or a compost-and-feed bundle. Most UK buyers have a windowsill and want flowers without soft, stretched growth. The Royal Horticultural Society says to feed indoor cacti once a month from April to September with a high-potassium liquid or a specialist cactus feed, and to rest most desert cacti from about November to early March with no feed. The checks sit in the [cactus fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/cactus-fertiliser/sub/cactus-fertiliser-buying-guide). A concentrate suits a season of monthly watering. Granules suit someone who will not measure, if the tub prints a rate. A foliar mist is a different habit, and cacti are not leafy houseplants. A compost-and-feed bundle is two products in one order.
A cactus fertiliser is plant food for cacti and usually other succulents, sold on amazon.co.uk as a dilute liquid, a ready-to-use drip or spray, slow-release granules, or a compost-and-feed bundle.
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Question 1 of 2
Will you measure a concentrate?
COMPO’s 250 ml cactus fertiliser is £17.32, the highest shelf price in this set, with 4.7 stars from 2,791 reviews on amazon.co.uk. The 50 saved texts are marked Reviewed in Germany, and the file has no Reviewed in the United Kingdom block. Those texts describe healthier cacti and succulents and easy mixing. Repeated complaints are a leak in transit and a dented bottle. The mixing-ratio field is 1:x, which is not a usable dose, and the bullets give no NPK. One reviewer uses half a stated dose, and a dosing scale in the cap appears in a review, not on the UK bullets. Rank 849 in Flower Fertilisers sits a long way from the cactus-category leader. The star count is large, and the UK evidence in this file is not.
Pros
Cons
Best for: A buyer who can read a dose on the bottle and will not treat the German texts as a UK verdict
Less suitable: A UK windowsill buy that needs a stated dilution and UK review texts
Specifications
Common questions
What dose does the COMPO listing give?
The mixing-ratio field is 1:x. That is not a usable dose. The bullets say strength, healthy growth and flowers, with no further detail and no NPK. Indoor use and safety for all cactus types are unanswered questions.
Are the 2,791 reviews from the UK?
The star line is on the amazon.co.uk listing. The 50 review texts in the saved listing are marked Reviewed in Germany. There is no Reviewed in the United Kingdom block.
What problems show up in those texts?
Reviewers describe healthier cacti and succulents and easy mixing. Repeated complaints are a leak in transit and a dented bottle. One reviewer uses half the stated dose. A dosing scale in the cap is mentioned in a review, not on the UK bullets.
Baby Bio’s 175 ml cactus food is a liquid concentrate with a listing ratio of 1:100, and the item highlight says that bottle makes up to 70 litres for indoor and outdoor cacti and succulents. At £3.99 it is rank 1 in Cacti & Succulent Fertilisers, with 4.7 stars from 689 reviews and UK review texts in the saved listing. In the first 50 of those UK reviews, people mention perkier plants, flowering and a bottle that lasts, and some describe half a cap in 1 litre once a month. There is no repeated product defect in that sample. One unclear line says the plants were fried, and a few buyers had not seen growth yet. The listing names Mammillaria, aloe and Christmas cacti, and it does not state an NPK or a pet-safety line. A retailer figure of 5-5-5 is not printed on these amazon bullets, so this take does not treat it as the listing analysis.
Pros
Cons
Best for: A windowsill or outdoor pot where you will measure a dilute liquid
Less suitable: Someone who will not measure, or who needs a printed NPK on the listing
Specifications
Common questions
How does the listing say to mix Baby Bio cactus food?
The mixing-ratio field is 1:100. The item highlight says the 175 ml bottle makes up to 70 litres. UK reviews in the saved listing also describe half a cap in 1 litre once a month.
Which plants does the listing name?
Cacti and succulents, including Mammillaria, aloe and Christmas cacti. The bullets say indoor and outdoor use. There is no pet-safety line.
What comes up in the UK reviews?
In the first 50 UK reviews, people praise perkier plants, flowering and a bottle that lasts. There is no repeated product defect. One unclear line says the plants were fried, and a few buyers had not seen growth yet.
CULTIVERS is 250 g of slow-release granules for cacti, succulents and fleshy plants in pots and planters, at £11.66. The bullets name NPK, organic matter, humic acids and microelements, and they give neither NPK numbers nor a gram rate. One bullet says the product is 100% natural and harmless to animals. Indoor use is asked and not answered. The star line is 4.6 from 15 reviews, and the only saved text is an Italian review of an outdoor zen garden that stayed healthy and grew fairly quickly. A slow-release tub with no gram rate on the listing is a feed you cannot measure from the page, and you also cannot simply stop mixing it when a desert cactus rests.
Pros
Cons
Best for: Pots and planters, if the tub in your hand prints a gram rate the listing omitted
Less suitable: A windowsill where you want to stop in autumn by not mixing a liquid
Specifications
Common questions
What nutrients does the CULTIVERS listing state?
The bullets name NPK, organic matter, humic acids, essential nutrients and microelements. They do not give NPK numbers or a gram rate.
Does the listing say it is safe for pets?
Yes. One bullet says it is 100% natural and harmless to animals. Indoor use is asked and not answered. The bullets say pots and planters.
What is in the saved review?
One Italian review describes an outdoor zen garden of succulents that stayed healthy and grew fairly quickly. The star line is 4.6 from 15. There is no UK review text in the file.
The Topline bundle is 10 litres of peat-free compost plus 175 ml of cactus feed, at £13.99, with 4.5 stars from 62 UK reviews and rank 6 in Cacti & Succulent Fertilisers. The feed bullets name Mammillaria, Sempervivum, aloe and Christmas cacti, and there is no feeding guide in the bullets. The mixing field 10000:175 restates the pack, and it is not a dose. One bullet says excellent drainage and that it prevents waterlogging, and a later bullet says excellent water retention. In the seven UK reviews, the repeated complaint is the compost: one says it stays wet, turns to soft sludge and compacts, and that perlite did not fix it. Other reviews say the plants were happy after potting and that the bag size was good value. The bottle of feed is not what those reviews criticise, so you are judging two products in one order.
Pros
Cons
Best for: Repotting a few indoor cacti if you can check how the compost holds water
Less suitable: A buyer who only wanted a measured liquid, or a cactus that needs a fast-draining mix
Specifications
Common questions
What is in the Topline bundle?
The listing is 10 litres of peat-free compost for cacti, succulents and bonsai, plus 175 ml of cactus feed. The feed bullets name Mammillaria, Sempervivum, aloe and Christmas cacti. There is no feeding guide in the bullets.
Does the listing claim the compost drains?
One bullet says excellent drainage and that it prevents waterlogging. A later bullet says excellent water retention. One UK review says the compost stays wet, turns to soft sludge and compacts, and that perlite did not fix it.
Is the 175 ml feed criticised in the reviews?
In the seven UK reviews, the repeated complaint is the compost, not the bottle of feed. Other reviews say the plants were happy after potting and that the bag size was good value. The star line is 4.5 from 62.
The FITO 32 ml drip is ready to use: you snip the top and push the nozzle into the compost, and the listing says that feeds a plant for up to 15 days without measuring. At £3.61 it is the cheapest pack in this set, with 4.4 stars from 100 amazon.co.uk reviews. The saved listing holds one UK review that says it does the job, and one Italian review that calls it a good feed for succulents, with no repeated defect in those two texts. The title says cactus, while the target-species line says houseplant, and the listing does not answer whether it suits every cactus indoors. There is no stated NPK and no place-of-use line. A single 15-day drip covers one plant for a fortnight, which is a different job from a bottle you dilute across a summer.
Pros
Cons
Best for: One windowsill cactus when you will not measure a concentrate
Less suitable: A row of pots you want to feed through the summer by diluting a concentrate
Specifications
Common questions
How do you use the FITO drip?
The listing says it is ready to use. Snip the top and insert the nozzle into the soil. It claims no mess and no measuring, and that it feeds a plant for up to 15 days.
Does the listing say it suits every cactus, indoors?
Those questions are on the listing and are not answered in the bullets. The title says cactus. The target-species line says houseplant, plant.
What do the saved reviews say?
The saved listing has one UK review that says it does the job, and one Italian review that calls it a good feed for succulents. There is no repeated defect in those two texts. The star line is 4.4 from 100.
Neudorff Organic Trissol is a 250 ml liquid for cacti at £9.58, and one bullet says it is safe for humans and animals. The amazon.co.uk star line is 4.3 from 22 reviews, but the eight saved texts are from Germany, Spain and Italy, and none is marked Reviewed in the United Kingdom. Those texts mention healthier cacti, a smell some people work around, and one delayed delivery. The mixing-ratio field is 1:0:0, which is not a usable dose. One German review describes mixing it in a small watering can once a month, and that rate is not on the bullets. Another bullet mentions high potassium and trace elements, with no NPK numbers, and indoor use is asked and not answered. You would be choosing a pet line and a star count, not a dilution you can copy from the page.
Pros
Cons
Best for: A buyer who can read a dose on the physical label and wants the pet line on the listing
Less suitable: Someone choosing from the amazon mixing field and from UK review texts
Specifications
Common questions
Does the listing give a mixing rate?
The mixing-ratio field is 1:0:0. That is not a usable dose. One German review mixes it in a small watering can and feeds a cactus once a month. That rate is not on the bullets.
What does it say about pets and nutrients?
One bullet says safe for humans and animals. Another mentions a high potassium content and trace elements, with German words left in the scrape, and no NPK numbers. Indoor use is asked and not answered.
Are the 22 reviews a UK sample?
The star line is on amazon.co.uk. The eight saved texts are from Germany, Spain and Italy. They mention healthier cacti, a smell some people work around, and one delayed delivery. None is marked Reviewed in the United Kingdom.
The UK GROW bottle is a 1 litre ready-to-use foliar spray at £14.99, and the unit count of 1,000 ml matches the title. The target species is cactus and succulent, while other bullets describe bonsai, orchid and tomato sprays in the same range, and the Best Sellers Rank is 21 in Bonsai Fertilisers. The star line is 3.0 from 10 UK reviews. One buyer said a sickly Sempervivum grew and made offsets, and one bought it again. One said it was not doing its job. One said the cap broke after the second use and that two cacti died. There is no NPK, and organic status is asked and not answered. A ready spray removes measuring, and this small UK sample is too split to treat the bottle as a settled feed.
Pros
Cons
Best for: A trial on one succulent if you can accept a small, mixed UK review sample
Less suitable: A collection you will not risk, or a buyer who wanted a concentrate with a ratio
Specifications
Common questions
Is this a concentrate or a spray you use as it is?
The mixing-ratio field says ready to use, and the application method is spray. The unit count is 1,000 ml, which matches the 1 litre title. There is no NPK. Organic status is asked and not answered.
Why do the bullets mention bonsai, orchids and tomato plants?
Those lines describe other sprays in the LeafLuxury range. The target species on this listing is cactus and succulent. The Best Sellers Rank is 21 in Bonsai Fertilisers.
What do the UK reviews report?
One buyer said a sickly Sempervivum grew and made offsets. One bought it again. One said it was not doing its job. One said the cap broke after the second use, and that two cacti died. The star line is 3.0 from 10.
Black Gold is a ready-to-use foliar mist for cacti, succulents and desert houseplants, at £14.95, and the bullets say to use it straight from the bottle between waterings on plants in a gritty mix. The title says 1 litre, while the unit count and liquid volume say 500 ml and the item weight says 500 g. Those fields do not match, and there is no NPK and no customer-review line. The specific uses name warm indoor conditions and pots with drainage holes. At this price you are paying for a no-mix mist whose fill size is inconsistent on the listing. A spray on the plant is a different job from watering a dilute feed into the compost.
Pros
Cons
Best for: A warm indoor pot, if the bottle you receive matches the volume you expected
Less suitable: A desert cactus you do not want to mist, or a buyer who needs a dilution into the compost
Specifications
Common questions
How much liquid does the listing actually state?
The title says 1 litre. The unit count is 500 ml, the liquid volume is 500 millilitres, and the item weight is 500 g. Those fields do not match the title.
How is it meant to be used?
The bullets say use it straight from the bottle, as a fine mist, between waterings, on cacti and succulents in gritty mix. Specific uses name warm indoor conditions and pots with drainage holes. There is no NPK.
Are there reviews?
No customer-review line and no review text in the saved listing.
Growth Technology Cactus Focus in this set is two 300 ml bottles, 600 ml on the unit count, at £13.96. The mixing-ratio field is 5:1000, and the listing says to mix with water and apply by watering to cacti and succulents. It claims macro- and micronutrients plus humic and fulvic acids, and it does not state an NPK. There is no customer-review line and no review text in the saved listing. Indoor use is asked and not answered. Rank 20 in Cacti & Succulent Fertilisers is a sales position, not a trial, and the twin pack costs more than three times the £3.99 bottle in this set that also prints a ratio.
Pros
Cons
Best for: Someone who will follow a 5:1000 mix and wants a spare bottle
Less suitable: A first windowsill buy that needs UK review texts before you pay
Specifications
Common questions
How does the listing say to mix Cactus Focus?
Mix with water and apply by watering. The mixing-ratio field is 5:1000. The listing does not state an NPK. Indoor use is asked and not answered.
What is in the pack?
The title says 300 ml, pack of 2. The unit count is 600 ml. The listing says the information applies to each unit. It claims macro- and micronutrients plus humic and fulvic acids.
Are there reviews?
No customer-review line and no review text in the saved listing.
Neudorff Biotrissol is a 250 ml liquid at £7.23 whose title says cactus fertiliser, and the listing has no customer-review line, no mixing ratio and no Best Sellers Rank. The model-number field reads NPK 3 1 5, with no nutrient table to confirm it, so that analysis stays unverified. Questions on the page about organic status and use on succulents are unanswered in the saved listing, and there is no use-by date in the file. You cannot follow a dose from the listing you are buying. That price is higher than the £3.99 bottle in this set that does state 1:100. Without a UK review text, the page gives you a brand name and a volume, not a result.
Pros
Cons
Best for: Only if the bottle in your hand prints a dose the listing left off
Less suitable: A first buy made from the amazon listing alone
Specifications
Common questions
Is Biotrissol stated as organic, and can it be used on succulents?
Both questions are on the listing. The saved listing does not answer them. The title says cactus fertiliser. There is no use-by date in the file.
What NPK does the listing state?
The model-number field reads NPK 3 1 5. There is no nutrient table and no mixing ratio. Treat that field as unverified.
Are there reviews in the saved listing?
No. There is no customer-review line and no review text.
Ten amazon.co.uk listings were scored from the stored pages and the review notes already on file. Shelf date 19 October 2026. There is no laboratory test. A ratio, an NPK string or a pet-safety line is the seller's claim. A mixing field that is not a dose, and a review file that is not from the UK, count against the listing. The highest stored score is the top pick. The best value is the lowest shelf price among packs you can use without measuring, where the listing also has a star line. It does not also take the top score. The weights below sum to 100.
Dose you can follow
30%A stated ratio or a ready-to-use instruction scores here. Baby Bio is 1:100 and Growth Technology is 5:1000. COMPO's 1:x, Organic Trissol's 1:0:0, Biotrissol's blank ratio and Topline's 10000:175 are not doses.
Form and job
25%A concentrate suits monthly watering through the season. A 15-day drip suits one pot. Granules suit someone who will not measure, if a rate is printed. A foliar mist is a different habit from a feed watered into the compost.
Listing evidence
25%UK review texts and a rank in Cacti & Succulent Fertilisers score higher than a star line whose saved texts are marked Reviewed in Germany, Spain or Italy. No customer-review line is a deduction. This is not a laboratory test.
Shelf price for the job
20%Prices are the amazon.co.uk shelf prices on 19 October 2026, from about £3.61 to £17.32. The lowest price is not the top score. A ready-to-use litre is mostly water if a windowsill only needs capfuls of concentrate.
Buy the form and a dose you can follow before you buy the star line. Prices below are amazon.co.uk shelf prices on 19 October 2026. This is not a laboratory test.
Cactus fertiliser is plant food for cacti and, on most of these listings, other succulents. The form has to match the job. A concentrate suits a season of monthly watering. A 15-day drip suits one pot. Granules suit someone who will not measure, if the tub prints a rate. A foliar mist is a different habit, and cacti are not leafy houseplants. A compost-and-feed bundle is two products in one order.
Most desert cacti take no feed from about November to early March. Christmas cactus is rested after September as well, on its own calendar. A winter dose is a common way to push soft growth.
COMPO's 4.7 from 2,791 is on amazon.co.uk, and the 50 saved texts are marked Reviewed in Germany. Organic Trissol's saved texts are from Germany, Spain and Italy. That is not a UK verdict.
The Topline order is 10 litres of compost plus 175 ml of feed. One UK review says the compost stays wet and turns to sludge. The bottle of feed is not what that review criticises. Judge them separately.
Match the form to the job before you match the star line. A concentrate suits a season of monthly watering when the listing prints a ratio. Baby Bio states 1:100 and says the 175 ml bottle makes up to 70 litres. Growth Technology Cactus Focus states 5:1000 on two 300 ml bottles. COMPO's mixing field is 1:x, and Neudorff Organic Trissol's field is 1:0:0. Neither is a dose. Biotrissol states no ratio at all. The FITO drip is ready to use and claims up to 15 days for one plant.
The Royal Horticultural Society points to a high-potassium liquid or a specialist cactus feed, monthly from April to September, then no feed for most desert cacti from about November to early March. Christmas cactus is fed from April to the end of September. A lawn feed is not a stand-in. An ASDA page, not the amazon listing, declares NPK 5-5-5 for Baby Bio 175 ml. This comparison does not treat that as the listing analysis.
Three typical situations, each with a recommendation from this comparison.
You want a dilute liquid from April to September and a stop in autumn. Baby Bio cactus food, 175 ml, is the top pick at about £3.99. The listing states 1:100 and up to 70 litres, for indoor and outdoor cacti and succulents, with 4.7 from 689 reviews. The amazon bullets do not print an NPK.
A single windowsill cactus does not need a bottle you dilute all summer. The FITO 32 ml drip is the best value at about £3.61. You snip the top and push the nozzle into the compost. The listing says up to 15 days, with 4.4 from 100 reviews. The species line says houseplant, and the title says cactus.
The Topline bundle is 10 litres of peat-free compost plus 175 ml of cactus feed, at about £13.99, with 4.5 from 62 UK reviews. There is no feeding guide in the bullets. One UK review says the compost stays wet and turns to sludge. Judge the compost and the feed separately, and check how the mix holds water.
The top pick is Baby Bio cactus food, 175 ml, at about £3.99. It has the highest stored score: a stated 1:100 ratio, up to 70 litres on the listing, indoor and outdoor cacti and succulents, 4.7 from 689 reviews, and rank 1 in Cacti & Succulent Fertilisers. The amazon bullets do not print an NPK. The best value is the FITO 32 ml drip at about £3.61, ready to use for up to 15 days on the listing, with 4.4 from 100 reviews. One drip is a fortnight for one plant. COMPO's 2,791 ratings are not treated as UK reviews. None of these scores is a laboratory test.
FITO cactus drip feeder, 32 ml
Lowest shelf price in this set, about £3.61, ready to use with a listing claim of up to 15 days and 4.4 from 100 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 sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the ten amazon.co.uk listings captured on 19 October 2026. An NPK on a retailer page is not the amazon listing analysis. A pet-safety bullet is a listing claim. There is no laboratory test in this comparison.
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.
