Independent comparisons. We may earn from shop links. More info

Best fertiliser sticks for different plant jobs

Updated: October 2026

The best fertiliser sticks are not necessarily the pack with the highest star average. A fern, a tomato plant and a pot of basil have different feeding needs, while several listings on this UK shelf omit an analysis or even disagree about how many sticks you receive. We compared the nine stored amazon.co.uk listings in our [fertiliser sticks comparison](/hub/fertiliser-soil-and-bark-mulch/fertiliser-sticks) by their stated plant job, printed information, dose and review evidence. None was laboratory-tested by us. The useful decision is therefore which listing fits your plant and which shortcomings you can accept.

The best fertiliser sticks are not necessarily the pack with the highest star average.

Our top picks

Substral Substral fertiliser sticks for green plants

Best overall

Substral Substral fertiliser sticks for green plants
5.8/10about £12.24
View offer
Generic Devonia citrus and fruit fertiliser sticks

Best value

Generic Devonia citrus and fruit fertiliser sticks
5.9/10about £7.99
View offer
Jobe's Organics Jobe's fertiliser spikes for fern and palm

Rank 3

Jobe's Organics Jobe's fertiliser spikes for fern and palm
8.1/10about £6.99
View offer
On this page
  1. 1.What best means in this comparison
  2. 2.Stronger matches for foliage plants, ferns and palms
  3. 3.Picks for tomatoes, citrus and herbs
  4. 4.Products to approach with more caution

What best means in this comparison

A top pick here is a match for a named job, not a claim that one stick outperformed every other product in compost. Start with the plant named on the listing. Next, look for a visible nutrient or mixing-ratio field, then check whether the pack gives a usable dose and duration. Finally, consider the origin and size of the review sample. A 4.5-star average from two ratings is much thinner evidence than 4.3 from 4,359, and thousands of ratings do not automatically describe UK use when the stored review texts come from other countries. If you want to apply the checks yourself, the fertiliser sticks buying guide explains the trade-offs before you order.

Stronger matches for foliage plants, ferns and palms

Jobe's fertiliser spikes are the most defensible job match for ferns and palms in this set. The title states 30 spikes, the claimed feeding interval is two months and the mixing-ratio field reads 16:2:6. More importantly, its 4.3-star line is based on 4,359 ratings, while all 50 stored review texts are marked United Kingdom. One stored UK review describes a pot-bound cycad dying after a spike was inserted, so Jobe's should not be forced into a dense root ball. The brand field says Jobe's Organics, yet the listing bullets do not state that the product is organic and the stored data does not provide certification. Substral fertiliser sticks for green plants are the alternative for general foliage. The title, unit count and coverage field all agree on 30 sticks, and the mixing field reads 10:7:9:2. The fourth figure is not explained, so it should not be relabelled as a particular nutrient. The 4.5 average from 3,240 ratings looks substantial, but the 50 stored texts are from Germany, France, Belgium, Spain and Sweden rather than the UK.
Substral Substral fertiliser sticks for green plants

Testsieger

Substral Substral fertiliser sticks for green plants
5.8/10about £12.24
View offer

Picks for tomatoes, citrus and herbs

For tomatoes and vegetables, the Devonia pack is the only product in this set that explicitly names that job. It claims up to 12 weeks of feeding, but it prints no analysis and conflicts over quantity: the title and unit count say 18 sticks while another item field says 30. Its 3.8 average comes from eight ratings and only one stored UK review text. It is not evidence for the high-potassium feeding commonly sought for fruiting tomatoes. Devonia citrus and fruit sticks name 18 sticks, claim up to 12 weeks and print a 1:1:1 mixing field. Its 4.5-star average is based on only two ratings, with no stored review body. Substral Naturen is the clearest option for herbs and balcony pots because it prints a dose: one to five sticks according to pot size, or two per plant in a balcony box, repeated every two months. The count is consistently 30. There is no NPK field, the average is 3.5 from six ratings and the three stored texts are marked Germany.

Products to approach with more caution

Devonia all-purpose sticks cover the broadest list of plants and print a 4-1-5 field, but the title says 20 sticks while the item field says nine. The 4.7 average rests on four ratings. Go Garden costs £15.00 in the recorded snapshot, prints no analysis, and conflicts between a title count of 40 and a unit count of one. Hiemible costs £6.50 and claims 60 days, but its 36-piece title conflicts with pack, item and gram fields. The generic 4-inch sticks cost £5.09, yet give no stick count, no nutrient field and no customer-rating line at all. The fertiliser sticks versus liquid feed guide covers control versus convenience, while the houseplant guide narrows the decision for indoor foliage.

Common questions

Which fertiliser sticks are the top pick for ferns and palms?
Jobe's 30-pack is the strongest match in this set because it specifically names ferns and palms, prints a 16:2:6 mixing field and has 50 stored UK review texts. It is not a laboratory winner. Do not force a spike into a pot-bound root system, and do not treat the Organics brand wording as proof of certification.
Which pack has the clearest instructions for herbs?
Substral Naturen gives the clearest stored dose: one to five sticks depending on pot size, or two per plant in a balcony box, repeated every two months. Its limitations are a missing NPK field, only six ratings and stored review texts from Germany rather than the UK.
Are the Devonia tomato sticks proven to be high in potassium?
No. The stored amazon.co.uk data provides no mixing-ratio or NPK field for the Devonia tomato and vegetable sticks. The product names the right crop and claims up to 12 weeks, but you should not infer a high-potassium formulation from the tomato wording alone.
Is the highest star rating automatically best?
No. Devonia all-purpose shows 4.7 stars, but that average is based on four ratings and the listing conflicts over pack count. Rating volume, review origin, plant fit, dose and transparent analysis all matter. Stars report customer sentiment; they do not replace a controlled growing trial.
Was any fertiliser stick laboratory-tested for this comparison?
No. This comparison uses stored amazon.co.uk listing fields, prices, ratings and review signals, plus public UK gardening guidance. It does not measure nutrient content, release rate or plant growth in a laboratory. "Best" therefore means the clearest match for a stated job with known limitations.

Related pages

How to use fertiliser sticks

Fertiliser sticks

Fertiliser sticks buying guide: five checks to make

Fertiliser sticks for houseplants: season and light

Fertiliser sticks vs liquid feed: which format to pick

Sources

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.

  1. RHS, houseplants growing guide (retrieved 19 October 2026)
  2. RHS, nutrition and feeding plants (retrieved 19 October 2026)
  3. RHS, fertilisers (retrieved 19 October 2026)
  4. RHS, fertiliser labels explained (retrieved 19 October 2026)
  5. RHS, container gardening maintenance (retrieved 19 October 2026)
  6. RHS, citrus (retrieved 19 October 2026)
  7. GOV.UK, manufacturing and marketing fertilisers (retrieved 19 October 2026)
  8. Fertilisers Regulations 1991 (retrieved 19 October 2026)