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Best Epsom salt fertiliser

Updated: October 2026

You already want magnesium sulphate, and you need a pack for a few tomatoes, a houseplant, or a bulk bucket, not a five-star title that may be one carton. The best Epsom salt fertiliser here is a match to a job you can read on the listing, with a skip when the stars are not about plants or the kilograms do not agree. Prices are the amazon.co.uk product data from 19 October 2026. The [Epsom salt fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/epsom-salt-fertiliser) is the full grid. Products Compared did not run a laboratory trial. A qualifying purchase can earn us a commission at no extra cost to you.

You already want magnesium sulphate, and you need a pack for a few tomatoes, a houseplant, or a bulk bucket, not a five-star title that may be one carton.

Our top picks

Westland Westland Epsom salts 1.5 kg

Best overall

Westland Westland Epsom salts 1.5 kg
8.2/10about £7.50
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Vitax Vitax Epsom salts 1.25 kg

Rank 2

Vitax Vitax Epsom salts 1.25 kg
8.9/10about £8.50
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Hexeal Hexeal Epsom salt 5 kg

Alternative

Hexeal Hexeal Epsom salt 5 kg
7.7/10about £11.40
View offer
On this page
  1. 1.A garden carton with plant reviews
  2. 2.Thin cartons and multipacks
  3. 3.A Beauty bucket only if you accept the review mix
  4. 4.Who should leave it

A garden carton with plant reviews

Westland B001P3SMQ0 is the garden carton with the large plant sample: £7.50, granules, 4.6 from 1,463 UK reviews. In the Amazon reviews the saved texts talk about greener leaves, tomatoes and roses. The mixing field is 1:0:0, which is not a grams-per-litre rate, and item weight is 1.44 kg against a 1.5 kg title. Vitax B003MPGFIG is £8.50, crystals, 4.5 from 675, and the mixing field prints 20g/l. The title says 1.25 kg and item weight is 500 g. It is the top pick by the score on this comparison because of the garden rank, the named plants, the 20g/l field and the review volume, after a deduction for the pack clash. If you only need the cheaper large sample, Westland is the best value at £7.50.

Thin cartons and multipacks

Levington B0BWFG6GQJ is £8.95, 5.0 from 3. The title and item weight say 1.5 kg. The included line says LEV MAGNESIUM SALTS 5X1.5KG and the package quantity is 1. Five stars from three people do not outrank 1,463. The Vitax multipacks are more cartons in the title, not a better salt. B0727YDXP2 says 2 × 1.25 kg at £14.95 while item weight is 1.25 kg. B074CD8PBK is another 2 × title whose unit count is 1,250.0 gram. B074CHK28W and B072BJMNTS have no star line. None of these inherit the 675 reviews on the single carton.
Westland Westland Epsom salts 1.5 kg

Testsieger

Westland Westland Epsom salts 1.5 kg
8.2/10about £7.50
View offer

A Beauty bucket only if you accept the review mix

Hexeal’s 5 kg bucket, B08MV2Q7TL, is £11.40. Title, unit count and item weight all say 5 kg, about £2.28 per kilogram. Rank is Beauty, Bath Salts. The 4.5 from 547 is the same line, and the same 50 UK texts, as the 2.5 kg bucket. Most are baths. That is one review file, not two fertiliser tests. Take the 5 kg bucket when the three weight fields agree and you accept a Beauty listing whose reviews are mostly soaks. Skip it when you want plant reviews.

Who should leave it

Leave Epsom salt when the whole plant is evenly pale, when the youngest leaves yellow first, or when the fruit has a black sunken end. The RHS lists Epsom salts as NPK 0–0–0 plus magnesium, so you still need a normal fertiliser. Rates, including why a tablespoon is not 20 g, sit on how to use Epsom salt fertiliser. Do not expect sweeter tomatoes. That claim is not in these listings.

Common questions

Which pack if I want plant reviews rather than bath reviews?
Westland at £7.50, 4.6 from 1,463, and the single Vitax carton at £8.50, 4.5 from 675, are the rows whose saved UK texts are about plants. Hexeal’s 547 is one shared file and mostly baths. A 5.0 on a multipack with one to five reviews is a thinner sample than either garden carton.
Is the cheapest price per kilogram the one for tomatoes?
Only after the weight fields agree, and only if you accept the department. The 5 kg Hexeal bucket is about £2.28 per kilogram because title, unit count and item weight all say 5 kg. The reviews are not a tomato trial. Westland and Vitax name tomatoes on garden listings and cost more per kilogram, with pack clashes you still have to read.
Does a 2× or 6× title mean that many cartons arrive?
Not from these fields alone. Several titles say two to six cartons of 1.25 kg while item weight stays 1.25 kg, and two of the two-carton and three-carton rows still show a unit count of 1,250.0 gram. The single carton is the Vitax row with 675 reviews. Confirm the parcel on the live page before you pay a multipack price.
Is the Levington row one carton or five?
The title and item weight say 1.5 kg. The included-components line says 5 × 1.5 kg and the package quantity is 1. The conflict is not resolved in the product data. Treat it as unknown until the live page is clear, and do not use the brand page’s 25% MgO as if this amazon row had printed it.
When is the 5 kg Hexeal bucket the wrong save?
When you need Garden rank, plant reviews, or a gram rate. It is also the wrong save if you wanted to bathe in a Westland carton, which is a different product, or if you planned to eat a food-grade pack. The bucket’s own FCC line says to check guidance before food use. This page does not give an eating dose.
Do I still need a normal fertiliser?
Yes, if the plant also needs nitrogen, phosphorus or potassium. Epsom salts are magnesium sulphate. The RHS states them as 0–0–0 plus magnesium. They do not replace a tomato feed used at the pack rate. If that feed is already high in potash, adding still more of it can widen a magnesium gap rather than close it.
Who should skip Epsom salt entirely?
Skip it for blossom end rot, for yellow young leaves, and for growth that is pale all over. Skip it if you have not checked the older leaves. Skip a multipack with no star line if you wanted evidence. A soil that already receives enough magnesium, and a plant whose older leaves are only slightly mottled, may need nothing from this basket.

Related pages

Epsom salt fertiliser buying guide

Epsom salt fertiliser for tomatoes

Garden or food-grade Epsom salt

Epsom salt fertiliser

How to use Epsom salt fertiliser on soil or leaves

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the twelve amazon.co.uk listings captured on 19 October 2026. No listing here prints a magnesium oxide percentage. A shared review file is not two garden tests. This is not a laboratory test and not an RHS trial of these packs.

  1. RHS, Nutrient deficiencies (retrieved 19 October 2026)
  2. RHS, Fertilisers (retrieved 19 October 2026)
  3. RHS, Blossom end rot (retrieved 19 October 2026)
  4. GOV.UK, Manufacturing and marketing fertilisers (retrieved 19 October 2026)
  5. Regulation (EC) No 2003/2003 article 9 (retrieved 19 October 2026)
  6. Regulation (EC) No 889/2008 Annex I (retrieved 19 October 2026)
  7. Fertilisers Regulations 1991, Schedule 2 (retrieved 19 October 2026)
  8. Soil Association, organic salt clarification, 10 September 2024 (retrieved 19 October 2026)