The best epsom salt fertilisers, compared.
Top pick: 2 × Vitax 1.25 kg Epsom salts Best value: Westland Epsom salts 1.5 kg – Highest score per pound among listings with at least 50 ratings, once the top score and the shared 2.5 kg review file are set aside, at about £7.50. Updated October 2026.
Epsom salt fertiliser is magnesium sulphate, sold in the UK as crystals or granules that you scatter on the soil or dissolve in water. You buy it when older leaves turn yellow between the veins, especially on tomatoes, often on light, free-draining soil or after a high-potassium feed. It is not a complete fertiliser. The usual analysis is an NPK of 0–0–0 plus magnesium, so it does not replace a balanced plant food. A pack that fits is one whose title and unit count agree on the kilograms, whose listing is written for plants rather than only as a bath salt, and whose dose you can weigh in grams. UK fertiliser marking states magnesium as magnesium oxide. The checks on plants, pack size and that magnesium line are in the [epsom salt fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/epsom-salt-fertiliser/sub/epsom-salt-fertiliser-buying-guide). Do not buy it for even pale growth, for yellow young leaves on acid-loving plants, or for blossom end rot. Those point to other causes. Do not spray the leaves in full sun, and do not use this salt as the only feed.
Epsom salt fertiliser is magnesium sulphate, sold in the UK as crystals or granules that you scatter on the soil or dissolve in water.
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Personal buying guide
Question 1 of 2
Which listing do you want?
This Vitax title says 2 × 1.25 kg at £14.95, the unit count is 2,500.0 gram and the number-of-packs field is 2, while item weight is 1.25 kg. The item-form field says Liquid and the application method says liquid feed, against a salts-carton title, and that clash is left as printed. The bullets still say a rapid cure for magnesium deficiency on tomatoes and house plants, but this listing prints no grams per litre. The star line is 5.0 from 5, and the only saved UK text says excellent, with no plant detail. Garden rank is 333,846, far below the single 1.25 kg carton. Five stars here are not the same evidence as 675 reviews on the single carton. Country of origin is United Kingdom, which does not settle the weight.
Pros
Cons
Best for: You have already checked that the parcel is two cartons, and you want the tomato and house-plant wording without paying the six-pack price.
Less suitable: You want the 675-review single carton, or a listing whose form and weight agree.
Specifications
Common questions
Does the item-form field match the title?
The item-form field says Liquid and the application method says liquid feed. The title is 2 × 1.25 kg Epsom salts fertiliser cartons. The conflict is not resolved.
Do the weight fields agree?
The title and unit count say 2 × 1.25 kg (2500.0 gram). Item weight is 1.25 kg.
How many review texts are saved?
The star line is 5.0 from 5. One United Kingdom text is saved. It says excellent and gives no garden detail.
The Levington title and the 1.5 kg item weight describe one carton at £8.95, while the included-components line says LEV MAGNESIUM SALTS 5X1.5KG and the package quantity is 1. The star line is 5.0 from 3, and the only saved UK text says it is great for veg plants, with no dose and no timing. Item form, application method and mixing ratio are all absent, so you cannot see how to apply it from the listing. The usage field says fruit and vegetable plants. The brand field is empty and the manufacturer field says Decco, while the title says Levington. The organic and bath questions on the listing are unanswered. A 10 × 10 × 10 cm dimension sits beside 1.5 kg, which is a small box if five cartons were what the included line meant.
Pros
Cons
Best for: You can see on the live page whether one 1.5 kg carton or five will be sent, and you only need a fruit-and-vegetable wording.
Less suitable: You need a printed rate, a large review sample, or a brand field that matches the title.
Specifications
Common questions
What pack does the listing print?
The title and item weight say 1.5 kg. The included-components line says LEV MAGNESIUM SALTS 5X1.5KG. Package quantity is 1. The conflict is not resolved.
Which plants and method are printed?
The usage field says fruit and vegetable plants. Item form, application method and mixing ratio are not stated. The organic and bath questions are unanswered.
Who is named as brand and manufacturer?
The brand field is not stated. The manufacturer field says Decco. The title says Levington.
The Pure Value 1 kg bag is £6.95, with item form granule and a Beauty rank of 423,563, which is not a garden rank. The star line is 5.0 from 2, and the only saved UK text says food grade, not a plant result. The title and the unit count agree on 1,000.0 gram, and item weight is absent, so you do not have a third weight line to clash with. The bullets copy the bath range of 250 g–1 kg and the garden line of 1–2 tablespoons in around 4.5 litres, naming tomatoes, apples, vines, raspberries, roses and rhododendrons. No magnesium oxide percentage is printed, and FCC wording tells you to check guidance before food use. Two reviews cannot tell you whether a tomato leaf greened up. At £6.95 per kilogram it sits near a garden carton, without the garden review sample.
Pros
Cons
Best for: You want a 1 kg food-grade bag to try a tablespoon mix, and you do not need plant reviews.
Less suitable: You want evidence from hundreds of garden reviews, or a declared analysis on the listing.
Specifications
Common questions
Is this a garden carton or a Beauty listing?
The best-sellers rank is in Beauty, Bath Salts. The title says food-grade magnesium sulphate. A garden bullet is also on the listing.
What pack size is printed?
The title and the unit count say 1 kg (1000.0 gram). Item weight is not stated.
Does the listing print a magnesium oxide percentage?
No. The magnesium oxide field and the mixing-ratio field are both not stated. The garden bullet says 1–2 tablespoons in around 4.5 litres.
The title says 4 × 1.25 kg at £25.95 and the unit count is 5,000.0 gram, while the item weight stays 1.25 kg. Item form says Liquid on a carton title, and there is no mixing field to show how that liquid would be made. The star line is 5.0 from 2, with no saved review text, so the five stars have no garden detail behind them. Roses and indoor plants are unanswered listing questions. Country of origin says United Kingdom, which is one concrete line on a thin page. Four cartons only make sense if the parcel matches the title, and the weight field does not confirm that. The specific-uses line mentions magnesium deficiency without naming a species.
Pros
Cons
Best for: You have confirmed a four-carton parcel with the seller and you do not need reviews to decide.
Less suitable: You want plant texts, a gram rate, or a form field that says crystals or granules.
Specifications
Common questions
Does the item-form field match the title?
The item-form field says Liquid. The title is 4 × 1.25 kg Epsom salts fertiliser cartons. The conflict is not resolved.
Do the weight fields agree?
The title and unit count say 4 × 1.25 kg (5000.0 gram). Item weight is 1.25 kg. Roses and indoor plants are unanswered listing questions.
Is there a saved review?
The star line is 5.0 from 2. No review text is saved.
The title says 5 × 1.25 kg at £34.78, item form is granules, and the mixing field prints 20g/1ltr, the same strength wording as the single carton. Item weight is 1.25 kg and there is no unit-count field, so five cartons are not confirmed by the weight. The star line is 5.0 from 1, and no review text is saved. “All plants” and organic are unanswered questions, and species stays not stated. One rating cannot carry a £34.78 multipack when the single carton has 675 reviews at £8.50. There is no best-sellers rank and no magnesium oxide percentage. The 20g/1ltr field is the useful line, and it does not prove the parcel contains five boxes.
Pros
Cons
Best for: You already buy this five-carton title and you only needed the 20g/1ltr field confirmed.
Less suitable: You are choosing a first pack and could buy the single carton with the large review sample.
Specifications
Common questions
Do the pack fields agree?
The title says 5 × 1.25 kg. Item weight is 1.25 kg. There is no unit-count field.
What rate is printed?
The mixing field is 20g/1ltr. There is no soil rate and no magnesium oxide percentage. “All plants” is an unanswered question.
Is there a saved review?
The star line is 5.0 from 1. No review text is saved.
The Westland granules are the largest garden sample here: 4.6 from 1,463 amazon.co.uk reviews at £7.50. Reviewers describe greener leaves after yellow tips, and they name tomatoes, cucumbers, geraniums, chilli, hydrangeas, roses, box, olive and bay. You can scatter the granules or dissolve them, and the target-species field names tomatoes, broccoli, cauliflower and cabbage. The mixing field is 1:0:0, which is not a grams-per-litre rate, so the page still does not tell you how much to weigh. Item weight is 1.44 kg against a 1.5 kg title and unit count, and liquid volume says 1,500 millilitres on a dry granule. Address labels stuck over the instructions, and salt leaked from the cardboard into the parcel. One review used a ring against slugs, which the bullets do not claim.
Pros
Cons
Best for: You want the biggest set of UK plant reviews on a garden carton at £7.50, and you can weigh a dose from the carton or from a published rate.
Less suitable: You need grams per litre printed on the amazon row, or a sealed plastic bucket.
Specifications
Common questions
What form and pack does the listing print?
Item form is granules. The title and unit count say 1.5 kg (1500.0 gram). Item weight is 1.44 kg and liquid volume is 1500 millilitres.
Which plants does the listing name?
The target-species field names tomatoes, broccoli, cauliflower and cabbage. Bullets also name trees, shrubs and flowers. Indoor and fruit-tree questions are unanswered.
Is a magnesium oxide percentage printed?
No. NPK is not stated. The mixing field is 1:0:0, which is not a magnesium oxide percentage and not a grams-per-litre rate.
Across 675 amazon.co.uk reviews, these Vitax crystals are the garden carton people water on when older leaves yellow, and several tomato notes describe a change within 4–7 days. The listing names tomatoes and houseplants, and the mixing field prints 20g/l, which is a grams line rather than a slogan. Reviewers also name bell peppers, gardenia, chilli, a laurel hedge after three applications, and lawn colour. The cardboard is the recurring complaint: a loose bottom flap, salt in the parcel, and sometimes no inner bag. The title, unit count and included line say 1.25 kg, while item weight is 500 g and liquid volume says 1 litre, so the pack is not settled by the page. One chilli review mentions a white dusty residue after a spray. No magnesium oxide percentage is printed, and the rose and indoor-plant questions are unanswered.
Pros
Cons
Best for: You want a garden carton that names tomatoes and houseplants and prints 20g/l, and you can check the carton weight when it arrives.
Less suitable: You need an MgO percentage on the amazon page, or a plastic tub that will not split in a wet shed.
Specifications
Common questions
What form and pack does the listing print?
Item form is crystals. The title, unit count and included line say 1.25 kg (1250.0 gram). Item weight is 500 g and liquid volume is 1 litre.
Which plants and rate are printed?
Bullets and the target-species field name tomatoes and houseplants. The mixing field is 20g/l. There is no soil rate in grams per square metre. Roses and indoor-plant questions are unanswered.
Is a magnesium oxide percentage printed?
No. NPK and the magnesium oxide field are not stated. The mixing field 20g/l is not an MgO percentage.
The 5 kg Hexeal bucket is £11.40, and the title, the 5,000.0 gram unit count and the item weight all say 5 kg, which is the cleanest pack line in this set. The star line is 4.5 from 547, but the 50 saved UK texts are the same file as the 2.5 kg listing, so this is not a separate test. Most of those texts describe baths, muscle soaks or feet, and only a minority mention gardening or pots. The garden bullet says 1–2 tablespoons in around 4.5 litres and names tomatoes, apples, grape vines, raspberries, roses and rhododendrons. Rank is Beauty, Bath Salts, item form is powder, and country of origin is China. Cracked buckets, lids off, and one delivery that arrived as a bag are the practical complaints. There is no magnesium oxide percentage, and the FCC line tells you to check guidance before any food use.
Pros
Cons
Best for: You want a 5 kg food-grade bucket whose weight fields agree, and you accept that the reviews are mostly baths.
Less suitable: You want a Garden-rank carton judged by plant reviews, or a dose in grams rather than tablespoons.
Specifications
Common questions
Do the pack fields agree?
Title, unit count (5000.0 gram) and item weight (5 kg) agree. Item form is powder. The 2.5 kg sibling field is granule.
What do the saved reviews mostly describe?
Fifty UK texts, the same set as the 2.5 kg file. Most describe baths, muscle soaks or foot soaks. A minority mention gardening or potted plants.
Is an MgO percentage printed?
No. The mixing-ratio field is not stated. The garden bullet gives 1–2 tablespoons in around 4.5 litres, and the bath bullet gives 250 g–1 kg.
This 2.5 kg Hexeal listing is £9.75, and the title, the 2,500.0 gram unit count and the item weight all say 2.5 kg. It shows the same 4.5 from 547 and the same 50 UK texts as the 5 kg file, including reviews that still name the 5 kg bucket, so it is not a second garden test. Those texts are mostly baths, muscle soaks and feet, with the same minority of pot and garden mentions. Item form is granule, while the 5 kg sibling field says powder. The garden bullet is the same 1–2 tablespoons in around 4.5 litres, with the same plant list. Rank is Beauty, 18 in Bath Salts, and country of origin is China. Split lids and courier drops sit in that shared sample. No magnesium oxide percentage is printed.
Pros
Cons
Best for: You want a smaller Hexeal bucket than 5 kg and you already know the star line is borrowed from the same texts.
Less suitable: You want reviews written about this 2.5 kg pack as a plant feed, or a Garden-rank carton.
Specifications
Common questions
Is this the same review line as the 5 kg bucket?
The star line is 4.5 from 547. The 50 saved UK texts are the same titles and bodies, in the same order, as the 5 kg listing. Several texts still name the 5 kg bucket.
What garden rate is in the bullets?
The garden bullet says 1–2 tablespoons in around 4.5 litres, and names tomatoes, apples, grape vines, raspberries, roses and rhododendrons. There is no magnesium oxide percentage.
What does the pack line agree on?
Title, unit count (2500.0 gram) and item weight (2.5 kg) agree. Country of origin is China. Rank is Beauty, Bath Salts.
This second two-carton Vitax title is £16.99 and says 2 × 1.25 kg, while the unit count is 1,250.0 gram and the item weight is 1.25 kg. There are no bullets in the listing, so plants, form and method are all not stated. The star line is 4.2 from 3, and no review text is saved, so you cannot see what the three people grew. Coverage says Medium and little else is filled in. It costs more than the other two-pack at £14.95 and tells you less. It does not inherit the 675-review sample from the single 1.25 kg carton. You would be paying for a title whose unit count still reads as one carton.
Pros
Cons
Best for: You only consider it after the live page shows two cartons and you accept a sample of three ratings.
Less suitable: You want named plants, a printed rate, or the review depth of the single Vitax carton.
Specifications
Common questions
Do the pack fields agree?
The title says 2 × 1.25 kg. The unit count is 1250.0 gram and the item weight is 1.25 kg.
What plants and method are printed?
There are no bullets in the listing. Species, application method, mixing ratio and item form are not stated.
Is there a saved review?
The star line is 4.2 from 3. No review text is saved.
There is no Customer Reviews line on this 3 × 1.25 kg Vitax title, so the score stays at 0 rather than a guessed star rating. The shelf price is £25.95. The unit count is 1,250.0 gram and the item weight is 1.25 kg, against a three-carton title, and that clash is not resolved. Form, plants and mixing ratio are not stated. “All plants” and organic are unanswered questions. You are reading a title and a coverage word of Medium, not a tested pack. The single 1.25 kg listing is the Vitax row with 675 reviews. Nothing here shows a garden result you can quote.
Pros
Cons
Best for: You already know this exact multipack from a shop and you are only checking that Amazon has no star line.
Less suitable: You want reviews, a printed analysis, or a pack size the fields agree on.
Specifications
Common questions
Is there a star line?
No. The listing has no Customer Reviews line and no review texts.
Do the pack fields agree?
The title says 3 × 1.25 kg. The unit count is 1250.0 gram and the item weight is 1.25 kg.
Which plants are named?
“All plants” is an unanswered listing question. Species, item form and mixing ratio are not stated. The organic question is unanswered.
This six-carton Vitax title is £40.44 and has no star line, so the score stays at 0. The unit count says 7,500.0 gram, which matches 6 × 1.25 kg, while the item weight is 1.25 kg, so the weight field still reads as one carton. Item form lists both Granules and Liquid, and that conflict is not resolved. Species and mixing ratio are not stated, and “all plants” is an unanswered question. Nothing on the listing shows a leaf, a dose or a delivery. It is the dearest row and the least documented. The single carton at £8.50 is the Vitax listing with a review sample you can read.
Pros
Cons
Best for: You are restocking a six-carton order you have already checked by hand.
Less suitable: You are comparing fertilisers on reviews, a gram rate, or a single agreed pack size.
Specifications
Common questions
What does the item-form field say?
The field lists Granules and Liquid. The title is 6 × 1.25 kg Epsom salts fertiliser cartons. The conflict is not resolved.
Do the weight fields agree?
The title and unit count say 6 × 1.25 kg (7500.0 gram). Item weight is 1.25 kg. There is no star line and no review text.
Which plants are named?
“All plants” is an unanswered listing question. Species and mixing ratio are not stated.
Twelve amazon.co.uk listings were scored from the stored pages and the UK review notes already on file. Shelf prices are from 19 October 2026. There is no pot trial and no RHS test of these packs. No listing in this set prints a magnesium oxide percentage, so a figure from a brand page is not a score input. Stars, review volume, a Garden rank, named plants and a printed gram rate add points. A pack clash, a liquid form on a dry-salt title, a shared review file and a thin sample are deductions. If the listing has no star line, the score is 0 and the other blocks are not applied. Price is not inside the score. The highest score is the top pick. The best value is the highest score per pound among rows with at least 50 ratings, excluding the top score and excluding the 2.5 kg row that repeats the shared review file. The weights below follow those positive blocks and sum to 100.
Star rating
56%Star rating on amazon.co.uk, taken as round(stars / 5 × 50) before this weight. A missing star line scores 0 and the other blocks are not applied.
Review volume
22%Size of that listing's review file, up to 20 points before this weight: min(20, round(log10(count) × 8)). A count under 10 also takes a thin-sample deduction.
Garden or Beauty rank
9%A Garden best-sellers rank adds the full block. A Beauty rank adds a smaller amount only when a garden bullet is also printed. No rank adds nothing.
Named plants
4%Added when the listing names species. An empty species field adds nothing.
Printed rate
9%Added when the mixing field is 20 g/l or 20 g per litre. A tablespoon line in about 4.5 litres scores lower. A 1:0:0 field or an empty field scores nothing. A mixing field is not an MgO percentage.
Match the leaf symptom, the listing type and a dose you can weigh before you match the star line. Prices below are amazon.co.uk shelf prices on 19 October 2026. This is not a laboratory test.
Epsom salt fertiliser is magnesium sulphate. In the UK you buy crystals or granules when older leaves yellow between the veins, especially on tomatoes. The Royal Horticultural Society treats that pattern as magnesium deficiency, often on light, free-draining soil or after too much potassium feed. It lists this salt as an inorganic product with an NPK of 0–0–0 plus magnesium. It is not a complete fertiliser, and it does not replace a balanced feed. Buy for the symptom first.
The pattern that matches this salt is yellowing between the veins on older leaves. Even pale growth, yellow young leaves on acid-loving plants, and blossom end rot are different problems.
A food-grade title can name magnesium sulphate and still sit in Beauty. The 2.5 kg and 5 kg Hexeal rows share one review file, and those texts are mostly baths.
A bullet of 1–2 tablespoons in about 4.5 litres is not the 20 g per litre foliar rate, and it is not 30 g per square metre on the soil. Weigh the dose.
Buy for interveinal yellowing on older leaves. Do not buy for even pale growth, yellow young leaves on acid-loving plants, or blossom end rot. A garden carton such as Westland or Vitax names plants and sits in Garden. Hexeal sits in Beauty and also prints a garden bullet, so the chemical name can match while the label does not. Prefer a title and a unit count that agree. The Vitax multipacks often put a two-carton, three-carton or larger title beside a 1.25 kg item weight.
None of these listings prints a magnesium oxide percentage. A proper UK fertiliser marking uses MgO where that regime applies. Vitax prints 20 g/l on the single carton. The five-carton title prints 20 g per litre and still shows an item weight of 1.25 kg. Westland's mixing field is 1:0:0, which is not a dose. Hexeal's garden bullet is 1–2 tablespoons in about 4.5 litres.
Three typical situations, each with a recommendation from this comparison.
You already use a high-potash feed, and older tomato leaves are yellow between the veins. Vitax Epsom salts 1.25 kg is the top pick at about £8.50, with 4.5 from 675 reviews and a mixing field of 20 g/l. The title says 1.25 kg and the item weight says 500 g, so check the carton. No magnesium oxide percentage is printed.
You are comparing a garden carton with a 5 kg food-grade bucket. Westland Epsom salts 1.5 kg is the best value at about £7.50, with 4.6 from 1,463 plant reviews. Hexeal 5 kg is about £11.40, and the title, unit count and weight agree on 5 kg, which is about £2.28 per kilogram. Those 547 reviews are shared with the 2.5 kg listing and are mostly baths.
A bloom tip is not a reason to dose. Buy only if older leaves are yellow between the veins. Westland's saved reviews name roses, and the bullets also name trees, shrubs and flowers. The mixing field is 1:0:0, which is not a gram rate, and no magnesium oxide percentage is printed. Hexeal bullets name roses too, but that review file is mostly baths.
The top pick is Vitax Epsom salts 1.25 kg at about £8.50. The listing names tomatoes and houseplants, the mixing field prints 20 g/l, and amazon.co.uk shows 4.5 from 675 reviews about plants. The title says 1.25 kg while the item weight says 500 g. The best value is Westland Epsom salts 1.5 kg at about £7.50, with 4.6 from 1,463 plant reviews. Its mixing field is 1:0:0, so you still weigh the dose yourself. Hexeal 5 kg is about £2.28 per kilogram where the weight fields agree, and those reviews are mostly baths. None of these scores is a laboratory test, and none of the listings prints a magnesium oxide percentage.
Westland Epsom salts 1.5 kg
Highest score per pound among listings with at least 50 ratings, once the top score and the shared 2.5 kg review file are set aside, at about £7.50.
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 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.
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.
