The best olive tree fertilisers, compared.
Top pick: Devonia olive tree fertiliser sticks Best value: Devonia olive tree fertiliser sticks – Lowest shelf price in this set, about £7.99, for pre-measured sticks. The title says 18 sticks and the file says 9 items. Updated October 2026.
Olive tree fertiliser is what you buy in the UK for a pot-grown olive, usually on a patio, in a conservatory or in a greenhouse. The usual forms are a liquid you dilute and sticks you push into the compost. A suitable pack names the olive, prints a dose you can follow, and shows the same size in the title, the item count and the volume field. The Royal Horticultural Society advises gritty, loam-based compost, controlled-release granules at planting, and a balanced liquid every month in the growing season if you want fruit. A nitrogen-rich feed late in the season encourages soft growth that frost can damage. Wet winter compost, and a tree you have just repotted, often need no extra feed. Drainage and a frost-free winter still do more for the tree than another bottle. Pale leaves while the pot stands in water are a root problem before they are a hunger problem. When to start a monthly liquid, and when to stop, is set out in [how to feed an olive tree](/hub/fertiliser-soil-and-bark-mulch/olive-tree-fertiliser/sub/olive-tree-fertiliser-how-to-feed).
Olive tree fertiliser is what you buy in the UK for a pot-grown olive, usually on a patio, in a conservatory or in a greenhouse. The usual forms are a liquid you dilute and sticks you push into the compost.
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Personal buying guide
Question 1 of 2
Will you measure a diluted liquid?
These pre-measured sticks avoid mixing a liquid feed and are listed for olive trees in both pots and borders. The listing says to push them below the soil line and replace them up to every 12 weeks, so the routine is simple once you know how many sticks the pot requires. At about £7.99 they are the lowest price in this set and the best value. The pack is unresolved: the title says 18 sticks, while the file records 9 items and a 9 g unit count. The 4.7-star average is based on only eight ratings, and there is no saved UK review text to show how the sticks performed over a growing season.
Pros
Cons
Best for: One or two potted olives when you prefer a low-effort, pre-measured feed and you can check the stick count.
Less suitable: Buyers who need a verified stick count, a printed NPK or UK review text about olives.
Specifications
Common questions
How do you use these Devonia sticks?
The bullets say push them below the soil line, water as normal, and replace them up to every 12 weeks. They claim a slow release of up to 12 weeks.
Does the pack contain 18 sticks?
The title says 18 sticks. Number of items is 9 and the unit count is 9.0 gram. Item weight is 150 g. The file does not reconcile those figures.
What do the reviews say?
The star line is 4.7 from 8 reviews. The saved listing has no review text, so there is no praise or complaint to quote.
This listing offers a three-by-one-litre liquid pack and prints a 1:249 mixing ratio, which is more information than a bottle with no dilution figure at all. The three saved UK reviews are short and positive: two describe happier or more vigorous potted olives, and one praises secure, spill-free packing. That is still a small sample, at 4.6 from seven ratings. The title says Vitax, while the brand and manufacturer fields say Janit-X, and the volume field records 1 litre against the three-pack title. At about £25.19 it is a multi-bottle option only if you can confirm the pack and you can measure 1:249. That ratio is not a cap measure and it is not an NPK.
Pros
Cons
Best for: Owners of several olives who can verify the three-bottle pack and measure a 1:249 dilution.
Less suitable: Someone who wants one unambiguous bottle or a simple millilitres-per-litre dose.
Specifications
Common questions
Who is the manufacturer on this listing?
The title says Vitax. The brand and manufacturer fields say Janit-X. Model VTT800X2 and part number VTT6Lx3 are both printed and do not match each other.
Does the file include a measuring cup?
The listing asks whether a measuring cup is included and does not answer. The mixing ratio is printed as 1:249. Liquid volume says 1 litre against a 3 x 1 litre title.
What do the three UK reviews say?
One says two potted olives previously on a general fertiliser had more zest after several months. One says the trees seem happy. One praises packing and no spillage. None of the three describes a fault.
Olive Focus is the most usable liquid in this set because the listing gives a dose of 10 ml per litre and says to alternate it with plain water. Its 4.5-star average from 506 ratings, with 50 saved UK review texts, is a broader evidence base than the other listings. Reviewers commonly report greener growth on potted olives, although some say it is too early to judge and one remained disappointed after about six weeks. It is the top pick for a patio olive if you will measure each feed. The pack conflicts: the title says 300 ml, while the file records two items and 600 ml, so confirm what the offer contains rather than calculate a price per bottle. It is about £12.48.
Pros
Cons
Best for: Potted olives on a patio, in a conservatory or in a greenhouse when you will measure 10 ml per litre.
Less suitable: Buyers who need a fully reconciled pack size or who do not want to measure a liquid concentrate.
Specifications
Common questions
How does the listing say to mix Olive Focus?
The bullets say mix 10 ml in 1 litre of clean water and alternate that solution with plain water. The file does not print a cap volume.
Is this a 300 ml bottle or a larger pack?
The title says 300 ml. Number of items is 2, and the unit count and liquid volume say 600. A bullet says the details apply to each unit in the pack.
What do the saved UK reviews talk about?
The star line is 4.5 from 506. The file holds 50 UK texts. Most describe greener growth on pot olives. Some say it is too soon to tell, one was disappointed after about six weeks, and one text is about dried flowers rather than an olive.
Cultivers is presented in the title as a five-litre organic liquid for olives, and the unit-count field also points to 5,000 ml. The liquid-volume field says 1 litre, the bullets describe a bonsai fertiliser, and the saved reviews are all marked as written in Spain. Several of those reviews mention greener olive trees, but others refer to weed control or plant stakes, so they are not UK evidence for this offer. The title's 100% organic wording has no named certifier in the file, and this page does not treat it as a Soil Association certificate. The printed 4:1:7 value is not labelled as a dilution or as an NPK. At about £35.29, confirm the container, the label and the crop before you buy.
Pros
Cons
Best for: A repeat buyer who can inspect the current label and confirm that the offer is a five-litre olive feed.
Less suitable: UK buyers who need an agreed pack size, UK review text or a dose in millilitres.
Specifications
Common questions
Is this listing a bonsai feed or an olive feed?
The title and the target species say olive, and the title says 5 L and 100% organic. The bullets say a special liquid ecological fertiliser for bonsai. The rank is 171 in Bonsai Fertilisers.
What volume does the file state?
The title says 5 L and the unit count says 5000 millilitre. The liquid volume field says 1 litre. One Spain review mentions a 5 litre can. No certifier is named for the organic claim.
Are the saved reviews from the UK?
No. All 15 texts are headed Reviewed in Spain. Several describe greener olives. One expected weed control. One describes plant stakes rather than a liquid.
This 500 ml UK GROW bottle is a small liquid pack for an olive tree, without a five- or ten-litre can. The listing describes a water-soluble nutrient applied to the soil, but it does not state how many millilitres to use per litre or how often to feed. Its 4.2-star line comes from nine ratings and appears unchanged on the larger UK GROW sizes, so it is not size-specific evidence. The bullets also name ornamentals, vegetables and orchids as well as olives. At about £9.99 it is a small pack to try, and you still need the bottle label before you use it. The file has no review text.
Pros
Cons
Best for: A buyer who wants a small liquid pack and can read the bottle label for the dose before feeding.
Less suitable: Anyone who needs a clear dilution rate on the listing, or olive-specific UK review comments.
Specifications
Common questions
How do you apply this 500 ml UK GROW bottle?
The application field says a water-soluble liquid applied to the soil. The file does not give millilitres per litre or a weekly interval.
Which plants does the listing name?
Target species is olive trees, and the bullets name Arbequina and Picual. The same bullets also mention ornamental gardens, vegetables, and orchids.
Are there UK review comments in the file?
The star line is 4.2 from 9, the same line as the 5 litre and 10 litre UK GROW files. This file has no review text.
The five-litre UK GROW can is more liquid than most owners of one patio olive will use. Its bullets name nitrogen, potassium, calcium and micronutrients, and they give neither percentages nor a dilution rate. The 4.2-star average from nine ratings is the same as on the 500 ml and ten-litre listings, and there is no saved review text for this size. At about £19.99 it makes sense only after you have checked the label for a dose and you know that several trees will use the can. This page does not quote a price per litre for it.
Pros
Cons
Best for: Several olive trees where you can verify the label dose and store a five-litre can.
Less suitable: A single small pot, or anyone comparing feeds by a dose printed on the listing.
Specifications
Common questions
What nutrients does the 5 litre listing name?
The bullets name nitrogen, potassium, calcium, and micronutrients. They do not print percentages or an NPK triple.
Is a dose printed?
No. The bullets say the liquid is water-soluble and that you apply it to the soil. They do not say how much or how often.
Does this size have its own reviews?
The file shows 4.2 from 9 and the same Garden rank as the 500 ml and 10 litre ASINs. There is no review text in this file.
The ten-litre UK GROW can is a bulk option, not a natural match for one container-grown olive. Its title targets olive trees, but the bullets also list lawns, orchids, roses, citrus and other plants. The file gives no dilution rate, no feeding interval and no UK review text, so you cannot tell from the listing how many feeds the can provides. Its 4.2-star average from nine ratings is shared with the smaller UK GROW listings. At about £39.99, consider it only for a sizeable collection after you have read the physical label and you know you can store it. This page does not quote a price per litre.
Pros
Cons
Best for: A large plant collection where you can verify the dose and use ten litres within the storage life.
Less suitable: One patio olive, limited storage, or buyers who need a printed dose and olive-specific UK reviews.
Specifications
Common questions
Is the 10 litre listing only for olives?
The title, model, and target species say olive trees. The first bullet lists multipurpose feed, vegetables, orchids, bonsai, tomatoes, lawns, hedges, succulents, chillies, citrus, and roses.
What dose does the file give?
None. The bullets say to follow the instructions and do not print a ratio. Indoor use, fruit trees, and herbs are questions with no answer.
How many reviews are saved as text?
The star line is 4.2 from 9. The saved listing has no review text.
Seven amazon.co.uk listings were scored from the stored pages and the UK review notes already on file. Shelf date 21 October 2026. There is no laboratory test. A dose or a pack line is what the listing prints. Where the title and the volume field disagree, both stay and the clash is a deduction. A 4.7-star row with no review text does not outrank a large UK review file. The highest score is the top pick. The best value is the lowest shelf price, and it does not also take the top score. The weights below follow the buying criteria in the digest and sum to 100. They say what the score was for. They are not a second ranking.
Olive on the label
20%The title or the target species should say olive. Bullets that also list lawns, orchids, roses or bonsai are a deduction. All-purpose seaweed and sequestered iron for acid-loving plants were not kept.
A dose you can follow
30%Olive Focus prints 10 ml in 1 litre, alternating with plain water. A field that only says 1:249 or 4:1:7 is not a cap measure and is not scored as an NPK. A missing ratio is a deduction.
Pack size that agrees
20%Title, item count and volume should describe the same pack. Olive Focus, the Vitax-titled triple, Cultivers and Devonia fail that check in the saved files. No price per litre is scored until they agree.
UK review evidence
20%Fifty UK texts on Olive Focus outweigh 4.7 from eight ratings with no text, a 4.2 from nine ratings copied across three UK GROW sizes, and fifteen Cultivers texts marked Reviewed in Spain.
Season and situation
10%A pot in growth can take a monthly liquid. Wet winter compost and a freshly repotted tree often should not. An all-year claim, and a nitrogen-rich feed late in the season, are deductions.
Buy the olive name and the dose before you buy the star line. A liquid, a stick and a can with no ratio are not one ladder. Prices below are amazon.co.uk shelf prices on 21 October 2026. This is not a laboratory test.
Olive tree fertiliser on amazon.co.uk is a liquid you dilute or a stick you push into the compost, almost always for a pot-grown olive. You are matching a feed to a tree in a container. You are not buying a cure for a wet root. A useful listing names the olive, prints a dose you can follow, keeps the title, the item count and the volume in agreement, and has UK review text about olives.
The three UK GROW listings show 4.2 from 9 and the files have no review text. That is one shared line, not three UK trials.
Those figures are printed as a mixing ratio. They are not a nutrient analysis, and they are not a cap measure you can follow.
Yellow leaves after a wet winter are often drainage, frost or leaf disease. Fix the saucer before you buy a larger can.
The product should say olive. A usable dose is millilitres you can measure. Olive Focus prints 10 ml in 1 litre of clean water, alternating with plain water. The maker's page uses that amount at every watering in the growing season and is not what the amazon bullets say, so the bottle label wins. A ratio of 1:249 or 4:1:7 is not that dose and it is not an NPK. The pack has to agree with itself. Olive Focus is titled 300 ml and filed as two items and 600 ml.
Fifty UK texts on Olive Focus describe greener growth on pot olives, with some reviewers saying it is too soon to tell and one disappointed after about six weeks. That file outweighs eight ratings with no text, nine ratings copied across three cans, and fifteen texts marked Reviewed in Spain. A Spanish review is not a UK trial, and a 100% organic line with no certifier is not a Soil Association certificate. Feed a pot that is in growth, monthly, if you want fruit, in gritty loam-based compost.
Three typical situations, each with a recommendation from this comparison.
You want a monthly liquid in the growing season and you will measure it. Olive Focus is the top pick at about £12.48. The listing says 10 ml per litre, alternating with plain water, and amazon.co.uk shows 4.5 from 506 reviews with 50 UK texts. The title says 300 ml and the file says two items and 600 ml.
Sticks suit you only if the stick count is clear. Devonia is the best value at about £7.99. The bullets say push in and replace up to every 12 weeks. The title says 18 sticks and the file says 9 items. The star line is 4.7 from 8, with no review text.
Fix the saucer and the drainage before you buy a larger can. Yellow leaves, peacock spot, frost damage and root rot are not hunger, and a feed will not clear them. If the pot then drains and the tree is in growth, Olive Focus is the measured liquid at about £12.48, not the 10 litre can.
The top pick for a patio, conservatory or greenhouse olive is Growth Technology Olive Focus at about £12.48, if you will measure 10 ml per litre and alternate it with plain water. amazon.co.uk shows 4.5 from 506 reviews, and the file holds 50 UK texts. The title says 300 ml and the file says two items and 600 ml, so do not turn that price into a price per bottle until you see the pack. The best value is the Devonia sticks at about £7.99, the lowest price here, with the same unresolved count: the title says 18 sticks and the file says 9 items, and there is no review text. The Vitax-titled triple prints 1:249 and three short UK texts, and the brand field says Janit-X. The three UK GROW sizes share 4.2 from 9 and do not print a dose. Cultivers is titled as a 5 L organic olive liquid, the volume field says 1 litre, and the saved texts are from Spain. None of these scores is a laboratory test.
Devonia olive tree fertiliser sticks
Lowest shelf price in this set, about £7.99, for pre-measured sticks. The title says 18 sticks and the file says 9 items.
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 maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the seven amazon.co.uk listings captured on 21 October 2026. A 1:249 or 4:1:7 line is not treated as an NPK. Spanish review texts are not UK trials. No laboratory compared these products.
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.
