The best fertiliser sticks, compared.
Top pick: Devonia all-purpose fertiliser sticks Best value: Devonia citrus and fruit fertiliser sticks – Lowest other pack price that prints a mixing field and an agreeing stick count: 1:1:1, 18 sticks, about £7.99. Updated October 2026.
Fertiliser sticks are solid, pre-measured plant food that you push into moist compost so watering releases nutrients near the roots over weeks. UK buyers use them for houseplants, balcony herbs, and pots of tomatoes, citrus, palms or ferns when they do not want to measure liquid feed. A useful pack shows a nitrogen, phosphorus and potassium analysis, a dose that names the pot size, a duration you can diary, and a stick count that matches itself on the listing. The Royal Horticultural Society still treats liquid feed as the routine feed for containers, and it says not to fertilise dry compost. Foliage plants want more nitrogen. Flowers and fruit want more potassium. A title that names every plant is not an analysis. In Great Britain, a product sold as a UK fertiliser needs a UK-established business and, where testing is required, a UK-approved laboratory. Northern Ireland may also sell an EU CE fertiliser. How to judge job, analysis, duration and pack honesty is set out in the [fertiliser sticks buying guide](/hub/fertiliser-soil-and-bark-mulch/fertiliser-sticks/sub/fertiliser-sticks-buying-guide).
Fertiliser sticks are solid, pre-measured plant food that you push into moist compost so watering releases nutrients near the roots over weeks.
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Personal buying guide
Question 1 of 2
What are you feeding?
Devonia's all-purpose sticks are intended to feed a broad mix of houseplants, herbs, flowers and edible crops for up to 12 weeks. The £7.99 listing prints a 4-1-5 mixing-ratio field, although this is seller data rather than a tested nutrient analysis. Its 4.7-star line looks strong, but it is based on only four ratings and the stored material contains just one UK review text. The pack information needs particular care: the title says 20 sticks while the item field says nine, so you cannot calculate a reliable cost per stick before ordering. There is also no pot-size dose in the listing bullets. This is a plausible general-purpose option when you are comfortable following the physical pack, but the thin evidence and conflicting count keep it from being a confident default.
Pros
Cons
Best for: Mixed pots where you want one general-purpose stick and will check the dose on the delivered pack
Less suitable: Buyers who need a verified pack count, a large UK review sample or a clearly documented dose
Specifications
Common questions
How many sticks does this listing say you get?
The title says 20 sticks. The number-of-items field says 9. The unit-count field says 9.0 gram. Those figures are not reconciled.
What analysis is printed?
The mixing-ratio field prints 4-1-5. That is not a tested analysis.
Does the listing say the sticks are organic?
The title and bullets say 100% organic. There is no certificate number in the file.
Substral's 30-stick pack is aimed chiefly at green and foliage plants, making its intended job clearer than a universal plant-food title. The listing prints a 10:7:9:2 mixing field, but the fourth figure is unexplained and the figures have not been independently tested here. The title, unit count and coverage field consistently state 30 sticks, which removes the count ambiguity found on several alternatives. A 4.5 rating from 3,240 reviews provides a substantial headline sample, although the 50 stored review texts come from Germany, France, Belgium, Spain and Sweden rather than the UK. Those reviews mention a blister ruler and dosing by pot diameter, but that is not a confirmed UK bullet in the stored listing. It suits foliage-focused shopping better than crop feeding, provided you do not mistake the international review sample for UK evidence.
Pros
Cons
Best for: Green and foliage plants when you want a clearly counted 30-stick pack
Less suitable: Shoppers who require UK review evidence or an unambiguous three-number analysis
Specifications
Common questions
How many sticks are in the pack?
The title, unit count, and coverage field all say 30 sticks.
What does the mixing-ratio field print?
10:7:9:2. The fourth figure is not explained in the file. It is not a tested analysis.
Are the stored reviews from the United Kingdom?
No. The raw sample of 50 is marked Germany, France, Belgium, Spain and Sweden. There is no United Kingdom marker.
Devonia's citrus and fruit sticks are purpose-labelled for indoor and outdoor potted fruiting plants, with a claimed duration of up to 12 weeks. The listing consistently names 18 sticks in the title and item field, although its unit is also shown as 18 grams against a 150 g item weight. A 1:1:1 mixing-ratio field is printed, but it is seller data and not a tested analysis. The 4.5-star line comes from only two ratings, and there is no stored review body to show how the sticks behaved in use. Instructions say to push them below the soil line and water normally, but no pot-size dose is given. This is a clear crop-specific proposition, yet its tiny evidence base and limited dosing detail mean you must rely heavily on the delivered label.
Pros
Cons
Best for: Potted citrus or fruit plants when you want a crop-specific slow-release stick
Less suitable: Buyers who need substantial review evidence or a documented dose before ordering
Specifications
Common questions
Which plants does the listing name?
Indoor and outdoor potted citrus and fruiting plants.
What analysis is printed?
The mixing-ratio field prints 1:1:1. That is not a tested analysis.
How long does the listing say a stick lasts?
The bullets claim slow release up to 12 weeks and say to replace up to every 12 weeks.
Jobe's 30-pack is the most clearly targeted option here for ferns and palms, with a stated two-month feeding period. Its mixing-ratio field prints 16:2:6, which points towards foliage feeding but remains listing data rather than a laboratory result. The 4.3 rating is backed by 4,359 reviews, and all 50 stored texts are marked as UK reviews, giving it the strongest relevant review base in this set. Feedback is not uniformly positive: one stored account describes a pot-bound cycad dying after use, a reason not to force spikes into a dense root ball. The brand field says Jobe's Organics, while the listing bullets do not make an organic claim. For a suitable fern or palm in moist, workable compost it is a well-evidenced job match, but the pack still lacks a pot-size dose in the bullets.
Pros
Cons
Best for: Ferns and palms in moist compost with enough space to insert a spike without damaging roots
Less suitable: Root-bound plants or buyers seeking a certified organic claim and precise dose chart
Specifications
Common questions
Which plants does the listing name?
Ferns and palm plants. The item form is sticks.
What analysis is printed?
The mixing-ratio field prints 16:2:6. That is not a tested analysis. The guaranteed-analysis bullet does not print those numbers.
Does the listing say the spikes are organic?
The brand field says Jobe's Organics. The bullets do not say organic.
Hiemible's spikes are presented as an all-purpose, direct-to-compost feed lasting 60 days. The £6.50 price is low within this shelf, but the quantity data is unusually confused: the title says 36 pieces, while other fields say two packs, one item and 1.0 gram. There is no mixing-ratio field and no dose by pot size, so the stored listing gives little basis for matching the feed to a particular plant. Its 4.0 rating rests on only three ratings and one UK review text, far too little evidence for a broad performance claim. The bullets mention organic fertilisers but provide no certificate number. This is a budget option only for a buyer prepared to inspect the delivered label closely; it is not a strong choice when dependable specifications matter.
Pros
Cons
Best for: Budget-conscious buyers who can verify quantity, analysis and dose on the physical pack
Less suitable: Anyone needing dependable online specifications or meaningful review evidence before ordering
Specifications
Common questions
How many spikes does this listing say you get?
The title says 36 pieces. The number-of-packs field says 2. The number-of-items field says 1. The unit-count field says 1.0 gram. Those figures are not reconciled.
Is an NPK printed?
No. There is no mixing-ratio field in the file.
How long does the listing say a stick lasts?
The bullets claim long-lasting nutrition for 60 days.
These Devonia sticks are specifically presented for tomatoes and vegetables, with a claimed feeding period of up to 12 weeks from spring to autumn. The title and unit count say 18 sticks, but the number-of-items field says 30, so the listing does not support a dependable unit-price calculation. It also provides no mixing-ratio or NPK field, leaving you unable to judge the nutrient emphasis from the stored data. The 3.8-star score comes from only eight ratings, with one UK review text available in the raw sample. Application is described only as inserting a spike near the plant base, without a dose by pot size. This pack may appeal if you want a crop-labelled stick, but a tomato grower seeking a documented high-potassium feed should look for clearer analysis information.
Pros
Cons
Best for: Container crop growers who want a tomato-labelled stick and will verify the pack instructions
Less suitable: Anyone choosing tomato feed by nutrient analysis or needing a clear pot-size dose
Specifications
Common questions
How many sticks does this listing say you get?
The title and unit count say 18 sticks. The number-of-items field says 30. Those figures are not reconciled.
Is an NPK printed?
No. There is no mixing-ratio field in the file.
How long does the listing say a stick lasts?
The bullets claim up to 12 weeks, from spring through autumn or at planting.
Go Garden sells these as multi-purpose sticks for indoor and outdoor plants, flowers, fruit and vegetable plots, with feeding claimed for up to 30 days. The title says 40 sticks, whereas the unit-count field says one, so the quantity information is not internally reliable. No mixing-ratio field is provided, which makes comparison with foliage- or crop-specific feeds difficult. Its 3.6 rating from 585 reviews is less persuasive for a UK buyer because the 50 stored texts are marked as India rather than the United Kingdom. At £15.00 it is the highest-priced listing in this set at the recorded snapshot, yet the conflicting count prevents a sound price-per-stick comparison. The broad plant coverage may be convenient, but the weak documentation gives little reason to prefer it over a more clearly specified pack.
Pros
Cons
Best for: Buyers wanting a short, monthly diary interval for mixed plants and willing to verify the delivered count
Less suitable: UK shoppers who prioritise transparent analysis, consistent pack data or locally relevant reviews
Specifications
Common questions
How many sticks does this listing say you get?
The title and model field say a pack of 40. The unit-count field says 1.0 count.
Is an NPK printed?
No. There is no mixing-ratio field in the file.
Are the stored reviews from the United Kingdom?
No. The raw sample of 50 is marked India. There is no United Kingdom marker.
Substral Naturen is a 30-stick pack for herbs and potted plants, and it provides the clearest dose instructions in this comparison. The listing specifies one to five sticks by pot size, or two per plant in a balcony box, repeated every two months. It calls the product organic-mineral, chloride-free and suitable for organic farming, but the stored data contains no certificate number and no printed NPK figures. The 3.5-star score is based on six ratings, while all three stored review texts are marked as German rather than UK reviews. At £12.40 it costs more upfront than several alternatives, although its consistent count and usable dose information reduce uncertainty. It is a practical herb-focused choice if instructions matter more to you than review depth, but not one to buy on rating strength.
Pros
Cons
Best for: Herbs, potted plants and balcony boxes where a printed dose is the priority
Less suitable: Buyers choosing by nutrient analysis, UK review evidence or certified-organic documentation
Specifications
Common questions
How many sticks does the listing say to use?
1–5 sticks by pot size. A balcony box is 2 per plant. Repeat every 2 months.
Is an NPK printed?
No. There is no mixing-ratio field in the file.
Does the listing say these sticks are for organic growing?
The bullets say organic-mineral, chloride-free, and suitable for organic farming. There is no certificate number in the file.
This generic listing describes 4-inch sticks for indoor flowering foliage and claims feeding for up to two months. It does not state how many sticks are supplied, despite a unit-count field of one, so the £5.09 price cannot be assessed on a per-stick basis. No mixing ratio, pot-size dose or customer-rating line is available in the stored listing. The phrase organic mineral core is a title claim without a certificate number in the data. At 4 inches, the sticks may also be awkward in small or densely rooted pots, although the listing provides no practical review evidence either way. The low headline price is therefore offset by too many unanswered basics, and this is better treated as an unverified listing than a recommended houseplant feed.
Pros
Cons
Best for: Only buyers willing to confirm the full pack specification before purchase
Less suitable: Small or root-bound pots and anyone who wants review-backed, comparable product data
Specifications
Common questions
How many sticks are in the pack?
The listing does not state a stick count. The title names 4-inch sticks.
Is an NPK printed?
No. There is no mixing-ratio field in the file.
Does this listing have a star line?
No. There is no customer-review line and no review text in the file.
Nine 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. A mixing field, an organic line or a duration is the seller's claim. Where two counts on one listing disagree, both stay and the clash is a deduction. A star percentage in the source file is the amazon.co.uk rating, not this score. The highest score on the weights below is the top pick. The best value is the lowest pack price among the other listings that print a mixing field and whose title and item field state the same stick count. It does not also take the top score. The weights below sum to 100.
Job and analysis
30%A named plant job and a mixing field that is actually printed. Jobe's names ferns and palms and prints 16:2:6. Devonia citrus names potted citrus and fruit and prints 1:1:1. Substral green plants print 10:7:9:2, and the fourth figure is not explained. A title that lists every plant, or a missing mixing field, is a deduction. A mixing field is not a tested analysis.
Dose and duration
25%A dose that names pot size, then a duration you can diary. Only Substral Naturen states 1–5 sticks by pot size and 2 per plant in a balcony box. The other bullets only say to insert the stick. Durations are claims: up to 30 days, 60 days, about 2 months, or up to 12 weeks. None was timed in compost. A longer claim is not a higher score by itself.
Pack and price
25%The stick count has to agree across the title and the item fields, and the price is the GBP pack price on 19 October 2026. Devonia all-purpose says 20 in the title and 9 in the item field. Devonia tomato says 18 and 30. The 4-inch listing states no count. Those packs are not priced per stick. A consistent count of 30 or 18 takes this block.
Review evidence
20%United Kingdom review texts, then the size of the file. Jobe's is 4.3 from 4,359, with a stored sample marked United Kingdom. Substral green plants at 4.5 from 3,240, and Go Garden at 3.6 from 585, are not UK samples. A file of two ratings with no review text adds little. One cycad report is a deduction, not a measured cause.
Match the plant job and a printed analysis before you match the star line. A mixing field is listing data, not a laboratory result. Prices below are amazon.co.uk shelf prices on 19 October 2026.
Fertiliser sticks, also called plant-food spikes, are solid pre-measured fertiliser pushed into moist compost so watering releases nutrients near the roots over weeks. UK buyers use them for houseplants, balcony herbs, and pots of tomatoes, citrus, palms or ferns when they do not want to measure liquid feed. The Royal Horticultural Society still treats liquid feed as the routine container feed in the growing season.
The Royal Horticultural Society says not to fertilise dry compost, and to check whether the compost bag already feeds the plant. Winter feeding because leaves look tired is a separate mistake.
Devonia all-purpose says 20 sticks in the title and 9 in the item field. Devonia tomato says 18 and 30. The 4-inch listing states no stick count. Leave the price per stick unset.
Substral green plants at 3,240 and Go Garden at 585 are not United Kingdom samples in the stored texts. Suitable for organic farming, with no certificate number, is a seller line.
Foliage wants nitrogen. Flowers and fruit want more potassium. Herbs are small edible pots. Citrus in Britain is fed all year, higher nitrogen in summer and a more balanced feed in winter, according to the Royal Horticultural Society. A title that lists every plant is not an analysis. Figures present in the files are Devonia all-purpose 4-1-5, Substral green plants 10:7:9:2, Jobe's fern and palm 16:2:6, and Devonia citrus 1:1:1. The fourth figure in 10:7:9:2 is not explained.
Substral Naturen states 1–5 sticks by pot size and 2 per plant in a balcony box, every 2 months. Other bullets only say to insert the stick. If the listing hides the dose, use the card in the box. Go Garden says up to 30 days. Jobe's, Naturen and the unbranded sticks say about 2 months or 60 days. Three Devonia packs say up to 12 weeks. Longer is less work and harder to stop if the plant reacts. None of those periods was timed here.
Three typical situations, each with a recommendation from this comparison.
Jobe's fertiliser spikes for fern and palm are about £6.99 for 30 spikes, with 4.3 from 4,359 reviews and a stored sample marked United Kingdom. The mixing field prints 16:2:6. The brand field says Jobe's Organics, and the bullets do not say organic. There is no pot-size dose. One UK review reported a dead cycad after a spike was forced into a pot-bound root ball.
Substral Naturen fertiliser sticks for herbs are about £12.40 for 30 sticks. The listing says 1–5 sticks by pot size and 2 per plant in a balcony box, every 2 months. No NPK numbers are printed. The organic-farming line has no certificate number. The star line is 3.5 from 6, and the stored texts are marked Germany, not the United Kingdom.
Devonia citrus and fruit fertiliser sticks are about £7.99. The title and the item field both say 18 sticks, the mixing field prints 1:1:1, and the duration claim is up to 12 weeks. That ratio is listing data, not a tested analysis. The star line is 4.5 from 2 ratings, with no review text. The Royal Horticultural Society says citrus in Britain is fed all year. This pack does not print a summer and winter split.
The top pick for ferns and palms is Jobe's fertiliser spikes for fern and palm at about £6.99. The listing names those plants, prints 16:2:6, states 30 spikes and about 2 months, and amazon.co.uk shows 4.3 from 4,359 reviews with a United Kingdom sample. There is no pot-size dose. The best value is Devonia citrus and fruit fertiliser sticks at about £7.99, the lowest other pack that prints a mixing field and a stick count the title and the item field both state. The field is 1:1:1, the count is 18, and the star line is 4.5 from 2 ratings with no review text. Herb sticks are the only pack that states a pot-size dose, and they print no NPK. None of these scores is a laboratory test.
Devonia citrus and fruit fertiliser sticks
Lowest other pack price that prints a mixing field and an agreeing stick count: 1:1:1, 18 sticks, about £7.99.
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 captured on 19 October 2026. A mixing field is not a tested analysis. Organic wording has no certificate number in these files. The Substral 3,240 sample and the Go Garden 585 sample are not United Kingdom reviews.
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.
