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Best herb fertiliser if you will measure a drop dose

Updated: October 2026

The best herb fertiliser in this set is not the listing with the lone 5.0, and it is not the one Amazon ranks second in Herb Fertilisers. It is the bottle that tells you how much to put in the watering can, for someone who will measure, with UK reviews you can actually read. This page is from Peter F., the DIY and tools editor, on 20 October 2026. Prices and stars come from the four amazon.co.uk listings on the [herb fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/herb-fertiliser). A qualifying purchase can earn a commission at no extra cost to you. If you are still deciding whether a pot needs any feed, use the [herb fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/herb-fertiliser/sub/herb-fertiliser-buying-guide) first.

The best herb fertiliser in this set is not the listing with the lone 5.0, and it is not the one Amazon ranks second in Herb Fertilisers.

Our top picks

Baby Bio Baby Bio Herb Food, pack of 2

Best overall

Baby Bio Baby Bio Herb Food, pack of 2
3.5/10about £5.98
View offer
Baby Bio Baby Bio Herb Food, 2 x 175 ml

Rank 2

Baby Bio Baby Bio Herb Food, 2 x 175 ml
6.9/10about £10.50
View offer
Substral Substral Naturen herb sticks, 30

Alternative

Substral Substral Naturen herb sticks, 30
6.2/10about £12.40
View offer
On this page
  1. 1.What best means in this set
  2. 2.Baby Bio with a printed dose
  3. 3.Sticks and the organic-input liquid
  4. 4.The about £5.98 pack and the empty 5.0

What best means in this set

The criterion is a printed dose for a pot of hungry herbs, checked against UK review texts on the same listing. Basil, parsley, mint and chives are the usual job. Rosemary, thyme and sage are a reason to feed less, not a reason to buy a stronger bottle. The Royal Horticultural Society's container guidance asks for a balanced leaf feed, not a high-potassium tomato food. On that rule the measuring default is Baby Bio Herb Food, 2 x 175 ml, at about £10.50. The editorial score is 69 out of 100, so it is the top pick in this comparison. That score is not a laboratory mark. It weights a dose you can follow and ten UK texts, and it deducts for a report of dead basil and for two bottles that did not match.

Baby Bio with a printed dose

The about £10.50 pack is for a cook who will count drops. The listing says 5–10 drops to 0.5 litre, or half a capful to 1 litre, poured on. The title is 2 x 175 ml and the unit count says 350 ml, while the liquid-volume field says 175 ml, so notice that clash. There is no feeding interval on this listing. One of the ten UK texts says potted basil died and sage wilted after the directions, while rosemary was unchanged. Skip this listing if you need an organic-farming sentence, a species name in the bullets, or a printed interval before you click. The dilution order is on how to use herb fertiliser.
Baby Bio Baby Bio Herb Food, pack of 2

Testsieger

Baby Bio Baby Bio Herb Food, pack of 2
3.5/10about £5.98
View offer

Sticks and the organic-input liquid

Substral Naturen is for someone who will forget a bottle. Thirty sticks cost about £12.40. The listing says 1–5 sticks by pot size, or two per plant in a balcony box, every two months. It names basil and parsley. The saved texts are Reviewed in Germany. Skip the sticks if you need British reviews, or if the herb is rosemary or thyme. Neudorff biotrissol is the about £7.81 bottle when you want certified in organic farming, 100 percent vegetable raw materials and safe for pets on the listing. The title says culinary herbs and names no species. The listing has no dose, no interval and no star line. Buy it only if you will read the bottle on arrival. Basil-specific naming is on fertiliser for basil.

The about £5.98 pack and the empty 5.0

Baby Bio in the pack of two is about £5.98 for two 175 ml bottles, 350 ml in the volume field. That is about £1.71 per 100 ml, the lowest liquid unit price here, which is why the comparison marks it best value on shelf price. The bullets say every two weeks for herbs indoors and in the garden. The ratio is 1:X. The best-value mark does not mean you should prefer it when you need a drop count from Amazon. If the bottle you receive prints a clear cap dose, the saving is real. If it prints 1:X, you have bought an interval without a strength.

Common questions

Which listing is the sensible default if I will measure?
Baby Bio Herb Food, 2 x 175 ml, at about £10.50. It prints 5–10 drops per 0.5 litre or half a capful per litre, with 4.4 from 62 reviews and ten UK texts. It does not print how often, and one UK text says basil died after directed use. It is not a lab score.
Who should buy sticks instead?
Someone with basil or parsley indoors or in a balcony box, who will not remember a can, and whose pot sits in the 1–5 stick range. Substral says two sticks per balcony-box plant and a repeat every two months, at about £12.40 for 30. Skip them for UK reviews, for a lean woody herb, or for compost that already feeds for months. The German no-growth texts are not British evidence.
Is Neudorff the organic pick, and what is missing?
It is the organic-wording pick, not an organic-food certificate. The bullets say certified in organic farming, vegetable raw materials, and safe for pets, at about £7.81 for 250 ml. The Amazon listing has no dose, no stars and no control-body code. Child safety and indoor use are unanswered. Read the label on arrival, and do not quote an outside NPK as if Amazon had printed it.
Does rank 2 in Herb Fertilisers mean better?
No. On this listing rank 2 belongs to the about £5.98 pack, beside 5.0 from one review and a ratio of 1:X. Rank is Amazon's category list at the time of the capture. It does not record yield or flavour. Use the dose line and the review texts.
Can I call any of these a test winner?
Not as a lab or a taste panel. The top pick is the highest editorial score of these four, on dose and UK reviews, with the damage report left visible. The best-value mark is the lowest liquid price per 100 ml of title volume, on the pack whose ratio is 1:X. Say top pick or best value. Neither badge is a national garden award.

Related pages

Liquid herb feed or fertiliser sticks

Herb fertiliser

Herb fertiliser buying guide for UK pots, beds and boxes

Fertiliser for basil on UK windowsills and in pots

How to use herb fertiliser on pots and balcony boxes

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the four amazon.co.uk listings captured on 20 October 2026. An organic-farming line is not an organic-food certificate. Texts marked Reviewed in Germany are not UK reviews. This is not a laboratory test or a taste test.

  1. RHS, Growing herbs in containers (retrieved 20 October 2026)
  2. RHS, How to feed plants (retrieved 20 October 2026)
  3. RHS, Mediterranean herbs in a pot (retrieved 20 October 2026)
  4. GOV.UK, Manufacturing and marketing fertilisers (retrieved 20 October 2026)
  5. The Fertilisers Regulations 1991 (retrieved 20 October 2026)
  6. GOV.UK, Organic food labelling (retrieved 20 October 2026)
  7. Plantura, Feeding herbs (retrieved 20 October 2026)
  8. BBC Gardeners' World, feeding pots (retrieved 20 October 2026)