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Mediterranean plant fertiliser: checks before you buy

Updated: October 2026

You have a lemon in a pot and an olive beside it, and the results all say Mediterranean. A Mediterranean plant fertiliser has to name the plants you grow, come in a form you can apply, and match the number of pots. An all-purpose liquid is a different product. A 20 kg sack is a different purchase from a 500 ml bottle. This guide stays on those rules. The [Mediterranean plant food comparison](/hub/fertiliser-soil-and-bark-mulch/mediterranean-plant-food) holds the four amazon.co.uk listings we kept, with prices in GBP. Those listings were read on 21 October 2026. There was no lab test. A qualifying purchase through our links can earn us a commission at no extra cost to you.

You have a lemon in a pot and an olive beside it, and the results all say Mediterranean. A Mediterranean plant fertiliser has to name the plants you grow, come in a form you can apply, and match the number of pots.

Our top picks

Cultivers Cultivers organic olive and Mediterranean granules, 20 kg

Best overall

Cultivers Cultivers organic olive and Mediterranean granules, 20 kg
4.1/10about £56.28
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Algoflash Algoflash Alimed Mediterranean plant fertiliser, 750 ml

Best value

Algoflash Algoflash Alimed Mediterranean plant fertiliser, 750 ml
3.3/10about £17.79
View offer
Substral Substral Naturen long-term citrus and Mediterranean, 1.2 kg

Rank 3

Substral Substral Naturen long-term citrus and Mediterranean, 1.2 kg
4.9/10about £19.19
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On this page
  1. 1.What the label has to name
  2. 2.Liquid, long-term, or a large sack
  3. 3.Citrus calendar versus olive calendar
  4. 4.What the prices in this set can tell you
  5. 5.Questions before you order

What the label has to name

A title that says citrus and Mediterranean plants groups lemons with a wider set. A title that says olive and Mediterranean plants starts with olives. A title that says Mediterranean plant fertiliser, while the target-species field only says Plants, has not given you a citrus list. If your patio includes oleander, you want that name, and the plant stays poisonous if eaten. All-purpose concentrates were left out. The best Mediterranean plant food page says who each kept pack is for.

Liquid, long-term, or a large sack

Substral Naturen liquid is 500 ml at £15.88. Algoflash Alimed is 750 ml at £17.79. Substral Naturen long-term is 1.2 kg at £19.19, claims up to three months, and the item-form field says Paste. Cultivers is 20 kg at £56.28, and specific uses say agricultural crops. A liquid suits a watering can. A 20 kg sack suits a crop row. Substral prints the mixing ratio as 1:0. Algoflash prints no ratio. The 1.2 kg listing and the sack give no gram rate for one pot.
Cultivers Cultivers organic olive and Mediterranean granules, 20 kg

Testsieger

Cultivers Cultivers organic olive and Mediterranean granules, 20 kg
4.1/10about £56.28
View offer

Citrus calendar versus olive calendar

The RHS feeds citrus all year: a high-nitrogen summer feed from late March to October, then a more balanced winter feed from November to mid-March. Olives get a balanced liquid about monthly in the growing season, and should not be fertilised after September. None of the four listings names both a summer feed and a winter feed. BBC Gardeners' World describes a more frequent olive feed. Do not average the two calendars. The method is on how to feed Mediterranean plants. Winter indoors is on citrus fertiliser for UK pots.

What the prices in this set can tell you

Household prices here run from £15.88 to £19.19. The 750 ml liquid is about £2.37 per 100 ml, and the 500 ml is about £3.18 per 100 ml. Those figures compare concentrates, not grams of paste. The 20 kg sack at £56.28 is about £0.28 per 100 g, which looks cheap only with many trees and dry storage. Citrus Focus at 1 litre was £8.95 on 21 October 2026, with 10 ml per litre weekly. That dose stays on its label. It is not one of the four listings.

Questions before you order

If the page prints 1:0, or prints nothing, leave the blank. A non-UK shop has quoted 14 ml per litre for a Substral part, and that shop does not deliver to Great Britain. Use the pack in your hand. Organic, suitable for organic farming, and 100% organic and vegan are different sentences, and no certifier is named. Extra nitrogen makes soft growth. Saved texts behind the large star counts are marked Reviewed in Germany or Reviewed in France.

Common questions

Is an all-purpose liquid the same as Mediterranean plant food?
An all-purpose liquid is sold for a wide range of plants. In this category the title or bullets name Mediterranean plants, citrus and Mediterranean plants, or olives together with Mediterranean plants. Multi-purpose concentrates were removed for that reason. A clearer dilution on an all-purpose bottle does not make it a citrus and olive feed. For a mixed patio, the plant names on the label are the first check.
Do I need a different bottle for a lemon and an olive?
You need a label that names both, or two products that name each plant. Citrus stay on feed through winter, changing from a high-nitrogen summer feed to a more balanced winter feed. Olives are fed in the growing season and then stopped. One Mediterranean bottle can serve both only when you follow each plant's season. It is not automatically a summer formula and a winter formula.
Is a liquid better than something I apply once?
A liquid fits a regular watering can. A long-term pack fits one application with a claimed duration. Here the liquids omit a usable dilution, and the 1.2 kg pack claims up to three months with no gram rate on the listing. Better means the instruction you can follow for the pots you have. A weekly liquid is the wrong tool if you wanted three quiet months.
When is 20 kg too much?
Twenty kilograms is too much for one lemon or one patio olive, and for anyone with nowhere dry to store the rest. Cultivers weighs 20 kg, costs £56.28, and sets specific uses to agricultural crops. A household pack around £16 to £19 matches a small collection more closely. The low price per 100 g helps only if you will use the sack.
Can I rely on the star rating if the reviews are not from the UK?
Quote the star line as the amazon.co.uk figure, with its count. The saved texts for the two large counts are marked Reviewed in Germany or Reviewed in France. The 5.0 from two reviews has no text. Keep the buying decision on the label, the form and the pack size.
What if the listing has no dilution?
Leave the rate blank until you can read it on the pack. Do not copy 10 ml per litre from Citrus Focus, a Vitax teaspoon rate, or 14 ml from a shop that does not deliver to Great Britain. A field that prints 1:0 is not a mixture you can make.

Related pages

Yellow leaves on a lemon tree

Mediterranean plant food

Best Mediterranean plant food for a small UK patio

Citrus fertiliser UK: feed a potted lemon all year

How to feed Mediterranean plants across the UK year

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 21 October 2026. A star line is not a count of UK reviews. Organic wording is quoted from the listing, and no UK organic body is named. Oleander toxicity is the Royal Horticultural Society plant note, not a result of feeding.

  1. RHS, How to grow citrus (retrieved 21 October 2026)
  2. RHS, How to grow olives (retrieved 21 October 2026)
  3. RHS, Citrus problems (retrieved 21 October 2026)
  4. RHS, Nutrient deficiencies (retrieved 21 October 2026)
  5. RHS, How to feed plants (retrieved 21 October 2026)
  6. GOV.UK, Manufacturing and marketing fertilisers (retrieved 21 October 2026)
  7. Fertilising Products Regulations 2020 (retrieved 21 October 2026)
  8. RHS, Oleander (Nerium oleander) (retrieved 21 October 2026)