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Best ericaceous compost for the hydrangea job in hand

Updated: October 2026

If you are choosing among similar bags, the best ericaceous compost is the one whose stated properties match the job in front of you. That might be a peat-free line and a printed pH, a low upfront price, or a smaller sack you can carry and store. The listing with the most stars does not automatically win. Our [hydrangea soil comparison](/hub/fertiliser-soil-and-bark-mulch/hydrangea-soil) shows the seven amazon.co.uk listings side by side. This page assigns them to practical uses and keeps the conflicting litre fields visible. These are editorial matches from the listings and public guidance, not a laboratory growing trial.

If you are choosing among similar bags, the best ericaceous compost is the one whose stated properties match the job in front of you.

Our top picks

SIC SIC Ericaceous 50 L

Best overall

SIC SIC Ericaceous 50 L
9.2/10about £12.49
View offer
Green Haven Green Haven Ericaceous 50 L

Rank 2

Green Haven Green Haven Ericaceous 50 L
9.4/10about £12.49
View offer
ecoblaze TerraGrade Ericaceous 50 L

Best value

ecoblaze TerraGrade Ericaceous 50 L
8.4/10about £9.99
View offer
On this page
  1. 1.There is no lab winner in this set
  2. 2.Best peat-free match with a printed pH
  3. 3.Best value among the 50 L titles
  4. 4.Best Laeto size for a smaller or larger job

There is no lab winner in this set

The listings answer different questions. SIC states peat-free and prints pH 4.0. indigo has peat free compost in its item-type field and claims six months of feed. TerraGrade is the cheapest by title litre. Laeto names hydrangeas. Green Haven has the largest rating base and claims slow-release iron. Every title litre differs from another volume field. TerraGrade says 50 L and 44 litres. Laeto's 100 L title sits beside 40 litres and 8.44 kg. Keep the listing and check the bag. The decision sequence is in the hydrangea soil buying guide.

Best peat-free match with a printed pH

SIC Ericaceous 50 L, B0BHWBVK99, is the clearest match when you want peat-free wording and a numerical pH. It states both, cost £12.49, and shows 4.7 from 445 reviews. Hydrangeas are not in the title. The title says 50 L, the volume field says 60 litres, and the weight is 10 kg. That is a specification match, not proof of fill or of growth. indigo Ericaceous 46 L, B0D73KTR7N, is the other peat-free wording, in the item type, plus a six-month feed claim. It cost £14.99. The 4.6 rests on three reviews. The title says 46 L beside 50 litres, with no printed pH. Choose SIC when stated acidity and a broader review file come first.
SIC SIC Ericaceous 50 L

Testsieger

SIC SIC Ericaceous 50 L
9.2/10about £12.49
View offer

Best value among the 50 L titles

TerraGrade Ericaceous 50 L, B0GS3FTL9Z, was the lowest price here at £9.99, about 20p per title litre, against about 25p for SIC and Green Haven at £12.49. It claims a low pH and does not print a number or peat-free. The volume field says 44 litres, the weight is 14.9 kg, and a review mentions receiving 30 L. The low price buys less specification than SIC. Green Haven 50 L, B09ZFFPXZQ, cost the same as SIC, with 4.6 from 1,053 reviews and a slow-release iron claim. It does not name hydrangeas, peat-free status or a pH. The 50 L title conflicts with 60 litres and 11.6 kg. It fits the large review file. TerraGrade fits the lowest upfront cost.

Best Laeto size for a smaller or larger job

Laeto is the only line here that names hydrangeas in a listing bullet. The 20 L, B0BX4HWZWW, cost £11.54 and is listed at 3 kg. It is the manageable sack when storage is tight, at about 58p per title litre, and the other volume field says 10 litres. The 50 L, B0BX4G5MK1, cost £13.79, about 28p per title litre, listed at 6 kg, beside a 20 litre field. The 100 L, B09D42G1H4, cost £26.99, about 27p per title litre, beside 40 litres and 8.44 kg, so do not call it a bulk bargain from the listing. All three share 4.6 from 656. Use 20 L to limit leftovers, 50 L for a mid-sized job, and treat 100 L cautiously. Why a title litre is not a pot fill is in the hydrangea soil for pots guide.

Common questions

Which bag is the top pick for a blue hydrangea pot?
Within this comparison, SIC is the clearest specification match because it says peat-free and prints pH 4.0. That does not guarantee blue flowers: the plant must be a colour-changing mophead or lacecap, aluminium must be available, and the mix must remain acidic. Read how to keep hydrangeas blue before buying solely for colour.
Is TerraGrade genuinely a 50 L bag?
The title says 50 L, but the volume field says 44 litres and the weight is 14.9 kg. A review also refers to 30 L. These details do not establish the delivered fill, so keep the order description and check the packaging when it arrives.
Why do the three Laeto sizes share one rating?
The 20, 50 and 100 L Laeto files show the same 4.6 from 656, and reviews include references to other sizes or brands. Treat that as a shared listing signal, not 656 reviews independently confirming each pack.
Is indigo worth more per title litre?
It may be if you specifically value the peat-free item-type wording and the claimed six-month slow-release feed. Its £14.99 price is about 33p per title litre, but only three ratings and no printed pH leave less evidence than SIC provides. The feed duration is a seller claim, not a result verified here.
Can Green Haven's reviews prove it works for hydrangeas?
No. The 1,053-review count is useful customer-feedback context, and one reviewer mentions hydrangeas, but the listing itself does not name the plant. Reviews are not a controlled comparison, and the listing does not state a numerical pH or peat-free status.
Should I buy a bag outside this seven-product set?
Possibly. Other peat-free ericaceous products, including Levington 50 L, appeared on amazon.co.uk when these listings were collected, but they were not included in this comparison. Apply the same checks: plant and colour goal first, then explicit peat wording, printed pH, consistent pack fields and a quantity you can use.

Related pages

How to plant a hydrangea

Hydrangea soil

How to keep hydrangeas blue with soil, pH and water

Ericaceous compost for hydrangeas: what to check first

Hydrangea compost for pots: mix, size and watering

Sources

Public UK sources checked for this page in October 2026. Prices, stars and review counts are from the seven amazon.co.uk listings on file. A peat-free line, a pH and a feed period are listing claims. Title litres are not treated as the fill when the volume field disagrees. This is not a laboratory test. A 2022 Defra announcement is not a ban already in force.

  1. RHS, how to grow shrubby hydrangeas (retrieved 23 October 2026)
  2. RHS, acidifying soil (retrieved 23 October 2026)
  3. RHS, peat-free compost (retrieved 23 October 2026)
  4. Gardeners' World, ericaceous compost (retrieved 23 October 2026)
  5. Gardeners' World, how to grow hydrangeas (retrieved 23 October 2026)
  6. Defra, sale of horticultural peat to be banned (retrieved 23 October 2026)
  7. Peat Free Partnership, legislation timeline (retrieved 23 October 2026)
  8. Consumer Rights Act 2015, section 11 (retrieved 23 October 2026)