The best rhododendron composts, compared.
Top pick: SIC Ericaceous 50 L Best value: Not awarded – The display badges and the digest name a top pick and do not name a best value. A low price per title litre is not a badge when the litre fields disagree. Updated October 2026.
Rhododendron compost is an ericaceous potting mix for acid-loving shrubs in a UK garden. You buy it for rhododendrons, azaleas, camellias, heathers and often blueberries, in a pot, a raised bed or a border that is already acid. The Royal Horticultural Society puts a suitable root zone at about pH 5.0 to 6.0, moist and well drained. One bag does not turn chalk or other alkaline ground into that soil. Near pH 7 you need a container, or a bed isolated by about 30 cm, and rainwater. A suitable bag names those plants. Call it peat-free only when the listing says so. The title litres should match the volume field. A printed pH is a number, not the words low pH. Nutrients last only for the stated window, then the plant needs an ericaceous feed. Open the bag outdoors and do not store it in a greenhouse. How to read the listing is set out in the [rhododendron compost buying guide](/hub/fertiliser-soil-and-bark-mulch/rhododendron-compost/sub/rhododendron-compost-buying-guide).
Rhododendron compost is an ericaceous potting mix for acid-loving shrubs in a UK garden.
34 products checked · 58 hrs invested · +21,400 readers
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Personal buying guide
Question 1 of 2
Where will the shrub grow?
SIC Ericaceous 50 L is the amazon.co.uk listing B0BHWBVK99 at about £12.49, with 4.7 from 445 reviews. The title says 50 L and the volume field says 60 L. The listing states peat-free and prints pH 4.0. A loam base is claimed. No feed window is stated. The item weight is 10 kg, and the country of origin is the United Kingdom. Saved reviews mention repeat use for azaleas, blueberries and a magnolia, and a texture without clumps. Buyers call the 50 L bags heavy. The display score is 92. The litre clash keeps the badge off, even with a stated pH and a peat-free line. A home pH comment in a review is not a laboratory test.
Pros
Cons
Best for: A buyer who wants a stated peat-free line and a printed pH 4.0, and who accepts a 50 L title against a 60 L volume field.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
Yes. The saved listing states peat-free. That is a line on this page, not a certificate, and it does not make the 50 L title match the 60 L volume field. The listing also prints pH 4.0.
Do the litre figures on this listing agree?
The title size is 50 L and the volume field is 60 L. The item weight is 10 kg. The pack fields do not agree. About £0.25 per title litre uses the 50 L title. One buyer said the volume looked fairly accurate. That is a review, not a measured fill.
What do the saved UK reviews repeat?
Across 50 saved UK review bodies, and a star line of 4.7 from 445 reviews, buyers report using it again for azaleas, blueberries and a magnolia. The texture is described as free of clumps. The 50 L bags are called heavy, and at least one review says the compost arrived very dry. Several reviews were written before use.
Green Haven Ericaceous 50 L is the amazon.co.uk listing B09ZFFPXZQ at about £12.49, with 4.6 from 1,053 reviews. The title says 50 L and the volume field says 60 L, so the pack fields do not agree. The brand field is not stated. The manufacturer is Green Haven. Peat wording and pH are not stated. A slow-release iron feed is claimed. Saved reviews describe greenhouse blueberries flourishing, with an even, clean texture, and one repot of Japanese maples and a thuja with no insects, mould or debris. A one-word review calls it heavy. The display score is 94, the highest star-and-review sum here. It has no badge because the litre fields disagree. A badge needs a match and at least 50 reviews. It is not a grow trial.
Pros
Cons
Best for: Acid-loving plants named on this listing, in a pot or a bed, if the 50 L title against a 60 L volume field is acceptable to you.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. A slow-release iron claim is not a peat claim and not a printed pH.
Do the litre figures on this listing agree?
The title size is 50 L and the volume field is 60 L. The item line also gives 60 x 50 x 15 cm and 11.6 kg. The pack fields do not agree. About £0.25 per title litre uses the 50 L title, not the 60 L field.
What do the saved UK reviews repeat?
Across 50 saved UK review bodies, and a star line of 4.6 from 1,053 reviews, greenhouse blueberries are described as flourishing, with an even, clean texture. One repot of Japanese maples and a thuja reported no insects, mould or debris. A one-word review calls it heavy. Some buyers had not used the bag yet.
Laeto Ericaceous 50 L is the amazon.co.uk listing B0BX4G5MK1 at about £13.79, with 4.6 from 656 reviews. The title says 50 L and the volume field says 20 L. Peat wording, pH and a feed window are not stated. The item weight is 6 kg. Saved reviews repeat quality and fast delivery. A repeat buyer used it for hydrangeas and called the bags manageable. One review calls it slightly more expensive than other brands. The saved review text overlaps the 20 L Laeto listing, so do not treat the two ASINs as independent samples. The display score is 92, from stars and review count only. The litre clash keeps the badge off. It is not a grow trial.
Pros
Cons
Best for: Acid-loving plants named on this listing, in a pot or a bed, if a 50 L title against a 20 L volume field is acceptable to you.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. No pH and no feed window are printed on this row either.
Do the litre figures on this listing agree?
The title size is 50 L and the volume field is 20 L. The item weight is 6 kg. The pack fields do not agree. About £0.28 per title litre uses the 50 L title. The 20 L Laeto title is a different ASIN, and its volume field says 10 L.
What do the saved UK reviews repeat?
Across 50 saved UK review bodies, and a star line of 4.6 from 656 reviews, quality and fast delivery are repeated. A repeat buyer used it for hydrangeas and called the bags manageable. One review calls it slightly more expensive than other brands. The saved text overlaps the 20 L Laeto listing.
Laeto Ericaceous 20 L is the amazon.co.uk listing B0BX4HWZWW at about £11.54, with 4.6 from 656 reviews. The title says 20 L and the volume field says 10 L, about £0.58 per title litre. Peat wording, pH and a feed window are not stated. The item weight is 3 kg. Saved reviews repeat quality and fast delivery, and mention manageable bags and hydrangeas. One review calls it slightly more expensive than other brands. The saved review text overlaps the 50 L Laeto listing, so do not treat the two ASINs as independent samples. The display score is 92, the same star-and-review sum as the 50 L title. The litre clash keeps the badge off. It is not a grow trial.
Pros
Cons
Best for: A patio shrub if you accept a 20 L title against a 10 L volume field, and you do not need the litres to match.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. The 20 L title does not print a pH or a feed window either.
Do the litre figures on this listing agree?
The title size is 20 L and the volume field is 10 L. The item weight is 3 kg. The pack fields do not agree. About £0.58 per title litre uses the 20 L title. The star line matches the 50 L Laeto listing.
What do the saved UK reviews repeat?
Across 50 saved UK review bodies, and a star line of 4.6 from 656 reviews, quality and fast delivery are repeated, along with manageable bags and hydrangea use. Complaints include price, bags left at the door, one delay, and compost that arrived completely dry. The saved text overlaps the 50 L Laeto listing.
Growmoor Ericaceous 40 L is the amazon.co.uk listing B094YJWWFY at about £11.39, with 4.6 from 439 reviews. The title and the volume field both say 40 L, and the pack fields agree. Peat wording is not stated, and no pH is printed. No feed window is stated. The item weight is 7.1 kg. Saved UK reviews describe camellias growing well, with a clean texture and no odd debris, and buyers name azaleas, rhododendrons, heathers and conifers. One review calls the mix dry sand with no substance, and says the plants did not grow well. Another ericaceous Growmoor purchase had fungus or mushroom spores. The display score is 90, from stars and review count only. Green Haven scores 94 on that sum, and its litres do not match, so the sources badge this 40 L bag instead. It is not a measured pH test and not a season-long grow trial.
Pros
Cons
Best for: A pot or a 30 cm isolated bed for acid-loving shrubs, when you want the title litres to match the volume field.
Less suitable: A chalk border you hoped one bag would convert, or a use that needs a peat-free statement this listing does not give.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. Organic would not be that claim either, and this page does not add a pH the listing does not print.
Do the litre figures on this listing agree?
The title size is 40 L and the volume field is 40 L. The item weight is 7.1 kg. The pack fields agree. Price per title litre is about £0.28 at about £11.39. That figure uses the title size, not a weighed fill.
What do the saved UK reviews repeat?
Across 47 saved UK review bodies, and a star line of 4.6 from 439 reviews, camellias are described as growing well, with a clean texture and no odd debris. Buyers name azaleas, rhododendrons, heathers and conifers. One review calls the mix dry sand and says the plants did not grow well. Another ericaceous Growmoor purchase had fungus or mushroom spores.
TerraGrade Ericaceous 50 L is the amazon.co.uk listing B0GS3FTL9Z at about £9.99, with 4.6 from 100 reviews. The brand field reads ecoblaze. The title says 50 L and the volume field says 44 L, about £0.20 per title litre, the lowest large-bag figure in this set. Peat wording is not stated. The pH line says low pH and gives no number. No feed window is stated. The item weight is 14.9 kg. Saved reviews describe blueberries and a camellia perking up. One buyer found a hole in the bag, weighed about 12 kg and doubted the 44 litre line. The display score is 84. The litre clash means no badge, and the sources do not call it best value. It is not a grow trial.
Pros
Cons
Best for: Acid-loving plants named on this listing if you accept a 50 L title against a 44 L volume field and no printed pH number.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. Low pH without a number is not a peat-free claim and not a pH you can quote.
Do the litre figures on this listing agree?
The title size is 50 L and the volume field is 44 L. The item weight is 14.9 kg. The pack fields do not agree. About £0.20 per title litre uses the 50 L title. One buyer weighed about 12 kg and doubted the 44 litre line.
What do the saved UK reviews repeat?
Across 39 saved UK review bodies, and a star line of 4.6 from 100 reviews, blueberries and a camellia are described as perking up, including in a hot summer. The texture is called good quality soil. Complaints include a hole in the bag, a split bag, and buyers who had only just filled pots.
Indigo Ericaceous 46 L is the amazon.co.uk listing B0D73KTR7N at about £14.99, with 4.6 from 3 reviews. The title says 46 L and the volume field says 50 L, about £0.33 per title litre. Peat wording and pH are not stated. A six-month slow-release feed is claimed. The item weight is not stated. One saved review calls it well worth the money, and another calls it very good stuff. With three ratings there is no repeated complaint in the file. The display score is 68. Fewer than 50 reviews, and the litre fields disagree, so there is no badge. Prefer a large review file over a 4.6 from three ratings. It is not a grow trial.
Pros
Cons
Best for: Only if you accept a 46 L title against a 50 L volume field and a feed claim backed by three ratings.
Less suitable: Multi-purpose planting, a chalk border you hoped one bag would convert, or a buyer who needs the title litres to match the volume field.
Specifications
Common questions
Does this listing say the compost is peat-free?
The saved listing does not say peat-free. If the bag does not say peat-free, do not treat it as peat-free. The six-month slow-release feed line is a listing claim, not a peat claim and not a printed pH.
Do the litre figures on this listing agree?
The title size is 46 L and the volume field is 50 L. The item weight is not stated. The pack fields do not agree. About £0.33 per title litre uses the 46 L title. The saved reviews do not discuss that clash.
What do the saved UK reviews repeat?
One saved UK review body, against a star line of 4.6 from 3 reviews, calls it well worth the money and very good stuff. That review does not describe a fault. Three ratings are too few for a repeated complaint, and they do not check the 46 L title against the 50 L volume field.
UK GROW Ericaceous 1 L is the amazon.co.uk listing B0BR8MTYQZ at about £7.99, with 4.0 from 63 reviews. The title and the volume field both say 1 L, so those two fields agree, at about £7.99 per title litre. The title says peat-free and a bullet still names peat in the mix. The stated pH is between 4 and 5. Slow-release iron is claimed, and added perlite is stated. The item weight is 290 g. Saved reviews call it the right product for azaleas and camellias, and expensive for the amount. The digest describes the 1 L and 2 L tubs as top-ups and names only the Growmoor 40 L bag for the badge. The display score is 73. It is not a grow trial.
Pros
Cons
Best for: A small top-up where 1 L is enough, if you can accept a peat-free title that still names peat in a bullet.
Less suitable: Filling a rhododendron pot, or a use that needs a peat-free statement the listing does not give cleanly.
Specifications
Common questions
Does this listing say the compost is peat-free?
The title says peat-free and a bullet still names peat in the mix. Do not treat that conflict as a clean peat-free claim. The listing does print a pH between 4 and 5, and it claims slow-release iron.
Do the litre figures on this listing agree?
The title size is 1 L and the volume field is 1 L. The item weight is 290 g. Those litre fields agree. About £7.99 per title litre is several pounds, which is why the tub is a poor way to fill a shrub pot. One review says there was less compost than expected.
What do the saved UK reviews repeat?
Across 9 saved UK review bodies, and a star line of 4.0 from 63 reviews, buyers call it the right product for azaleas and camellias. A blueberry was potted on arrival in sound condition. Complaints are the price for the amount, less compost than expected, and an unlabelled black bucket with no instructions.
UK GROW Ericaceous 2 L is the amazon.co.uk listing B0BR8KM1CQ at about £8.99, with 3.7 from 24 reviews. The title and the volume field both say 2 L, about £4.50 per title litre. The title says peat-free and a bullet still names peat. The stated pH is between 4 and 5. Slow-release iron and added perlite are stated. The item weight is 330 g. One buyer called it very good and used it for a new tree described as growing healthily. Another said the 2 L purchase was not even half a litre, and one buyer said the plant died, with no cause given. Only three review bodies were saved, two of them negative. The display score is 65. Twenty-four reviews are under the 50-review line, so there is no badge. It is not a grow trial.
Pros
Cons
Best for: A tiny top-up if 2 L is really all you need and you accept the peat-wording conflict.
Less suitable: A chalk border you hoped one tub would convert, or a use that needs a peat-free statement this listing does not give cleanly.
Specifications
Common questions
Does this listing say the compost is peat-free?
The title says peat-free and a bullet still names peat in the mix. Do not treat that conflict as a clean peat-free claim. The listing prints a pH between 4 and 5 and claims slow-release iron. Added perlite is stated.
Do the litre figures on this listing agree?
The title size is 2 L and the volume field is 2 L. The item weight is 330 g. Those litre fields agree. About £4.50 per title litre is still a top-up price. One saved review said the 2 L purchase was not even half a litre.
What do the saved UK reviews repeat?
Three saved UK review bodies, against a star line of 3.7 from 24 reviews, are a thin file. One buyer called it very good and described a new tree growing healthily. Another said the tub was not even half a litre. One buyer said the plant died, with no cause given. Two of the three saved bodies are negative.
Nine amazon.co.uk listings were scored from the saved pages dated 19 October 2026. This is not a grow trial and not an RHS test. The score is the star rating divided by five, multiplied by 70, rounded, plus the review count as log10 times 10, capped at 30. A badge needs at least 50 reviews and a volume field that matches the title litres. The display badge, and the digest, name only Growmoor Ericaceous 40 L. No best value is named. The 1 L tub also shows agreeing litres and 63 reviews, and the sources still do not badge it. The weights below sum to 100.
Amazon star rating
70%Star rating on amazon.co.uk, divided by five and multiplied by 70, then rounded. A 4.6-star row and a 4.7-star row are not equal. Five stars from three ratings do not outweigh a large file on their own. This block is 70 of the score. It is not a measured pH.
Review volume
30%log10 of the amazon.co.uk review count, times 10, capped at 30. Green Haven's 1,053 reviews take the cap. Three ratings add only a few points. The cap can place a clashing 50 L title above a bag whose litres match. It is not a test of the compost.
Match the chemistry and the litres before the star line. Multi-purpose compost and a continuous-release feed are different products. Prices are saved amazon.co.uk figures from 19 October 2026. This is not a laboratory test.
Rhododendron compost on amazon.co.uk is ericaceous potting mix for rhododendrons, azaleas, camellias, heathers and often blueberries. Shoppers are on chalk and need a pot or a raised bed, already have acid soil and want a sack, or have been shown multi-purpose compost or a plant food by mistake. The RHS target is about pH 5.0 to 6.0, moist and well drained. Stars on a listing are buyer ratings. They are not a grow trial. Start with the product type. It has to be ericaceous or acid compost.
Ericaceous compost is the root medium. Multi-purpose compost is the wrong chemistry. A continuous-release plant food is a separate category and does not replace the bag.
Compost alone will not hold pH on limey ground. Near pH 7, use a pot or a 30 cm isolated bed, and rainwater. Do not use aluminium sulphate.
Several titles here print 20 L, 44 L or 60 L in the volume field. Price per title litre uses the title, not a weighed fill. Confirm the sack you receive.
The title size and the volume field are two claims. They should be the same number before you compare price per litre. In this set only Growmoor 40 L, among the large bags, shows that match, with 439 reviews. The 1 L and 2 L UK GROW tubs also match, and they are top-ups at several pounds per litre. Laeto, TerraGrade, SIC, Green Haven and Indigo each print a clash. A 6 kg line on a 50 L title, or a buyer who weighed about 12 kg, is a reason to look twice, not a laboratory fill test.
Call the bag peat-free only when those words are on the listing. Organic is not peat-free. A Responsible Sourcing A–E mark is voluntary and is not proof. No retail peat ban was in force in these sources. UK GROW says peat-free in the title and still names peat in a bullet, so that row is a conflict, not a clean claim. SIC is the listing that states peat-free without that clash, and it also prints pH 4.0, while its litres do not match. A stated pH is a number. Between four and five is a range.
Three typical situations, each with a recommendation from this comparison.
You are on chalk or near pH 7, so the shrub needs a pot or a bed isolated by about 30 cm, plus rainwater. Growmoor Ericaceous 40 L is the top pick at about £11.39, with 4.6 from 439 reviews. The title and the volume field both say 40 L. It does not say peat-free and it does not print a pH. One bag will not convert the border.
The border is already acid and you want a 40–50 L sack. Growmoor Ericaceous 40 L lists 7.1 kg, lighter than the 50 L rows at 10–14.9 kg, and the litres match. SIC Ericaceous 50 L states peat-free and pH 4.0, at about £12.49, with 4.7 from 445 reviews. Its volume field says 60 L.
One shrub needs about 10–20 L. A 1 L tub is poor value at about £7.99 a litre. Laeto Ericaceous 20 L is the 20 L title, at about £11.54, with 4.6 from 656 reviews. The volume field says 10 L, and the saved reviews overlap the 50 L Laeto listing. If the litres must match, this row does not.
The top pick is Growmoor Ericaceous 40 L at about £11.39. The display badge and the digest treat it as the listing that clears a matching volume field and at least 50 reviews: both lines say 40 L, with 4.6 from 439 reviews. The listing does not say peat-free and does not state a pH. Green Haven scores 94 on stars plus review count, against Growmoor's 90, and its volume field says 60 L on a 50 L title, so it is not badged. UK GROW Ericaceous 1 L also shows agreeing litre fields and 63 reviews. The sources do not award it: the title and a bullet conflict on peat, and the tub is a top-up at about £7.99 a litre. No best value is named. TerraGrade is about £0.20 per title litre, and the volume field says 44 L against a 50 L title. None of these scores is a laboratory test.
Not awarded
The display badges and the digest name a top pick and do not name a best value. A low price per title litre is not a badge when the litre fields disagree.
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 the saved amazon.co.uk figures for the nine listings, dated 19 October 2026, not a live crawl. A score is stars plus review count, not a grow trial. A bag is peat-free only when the listing says so. No peat-sale ban was in force in these sources.
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.
