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Raised bed compost: what to decide before you buy a bag

Updated: October 2026

Raised bed compost is what you look up when a new bed needs filling, or last year's bed has sunk after a wet winter, and every bag only says compost. That word will not tell you whether you are buying the bulk of the fill, a smaller organic share, or a mix for pots. None of the six listings is titled raised bed compost. The [raised bed compost comparison](/hub/raised-beds-greenhouses-and-compost/raised-bed-compost) lines them up by price and size. This page orders the decision: material, then litres, then the words on the bag, and only then a brand. A lower price does not repair a bag that fails an earlier step.

Raised bed compost is what you look up when a new bed needs filling, or last year's bed has sunk after a wet winter, and every bag only says compost.

Our top picks

Munnie Munnie multi-purpose compost 60 L

Best overall

Munnie Munnie multi-purpose compost 60 L
7.3/10about £9.34
View offer
ecoblaze TerraGrade multipurpose compost 60 L

Rank 2

ecoblaze TerraGrade multipurpose compost 60 L
7.3/10about £10.99
View offer
GROWMOOR Growmoor multi-purpose compost 60 L

Rank 3

GROWMOOR Growmoor multi-purpose compost 60 L
7.8/10about £13.98
View offer
On this page
  1. 1.What you are actually buying
  2. 2.Litres before bags
  3. 3.Words on the bag
  4. 4.How the six listings sit in that order

What you are actually buying

A new bed is mostly soil. Compost is the smaller organic part, unless you are topping up a settled bed or filling pots. The Royal Horticultural Society describes seven parts topsoil, three parts organic matter, and two parts horticultural sharp sand. The organic matter can be garden compost, leafmould, or well-rotted manure. Those are parts, not a 70/30 split. Multi-purpose compost is a potting medium, and the RHS advises against spreading it across beds. Laeto's bullets say the blend combines topsoil and soil improver. That is a listing claim, not evidence of BS 3882, the standard for traded topsoil. The compost versus topsoil page takes the material choice further.

Litres before bags

Measure the inside in metres, then multiply length by width by depth by 1,000. A bed 1.2 m long, 0.6 m wide, and 0.30 m deep holds 1.2 × 0.6 × 0.30 × 1,000, which is 216 litres. Seven plus three plus two is twelve parts. Three twelfths of 216 litres is 54 litres of compost, leafmould, or manure. The other 162 litres are topsoil and sand. A 60 litre bag matches that 54 litre share, not the whole bed. Depth and settlement sit on the how to fill a raised bed page.
Munnie Munnie multi-purpose compost 60 L

Testsieger

Munnie Munnie multi-purpose compost 60 L
7.3/10about £9.34
View offer

Words on the bag

Peat-free is a wording test. If a bag does not say peat-free, the RHS says it likely is not. None of these six is titled peat-free. Munnie's text says "enabling the reduction of the use of peat". That is a cut in peat, not a peat-free bag, so you cannot buy it as one. The peat-free raised bed compost page sets out the wording, and the legal position, before you order. The Growmoor listing B08YF4YZ11 clashes in the same quiet way. The title says 2 × 60 L. The volume field says 60 litres. It also shows 22 kg, two packs, and £21.71 on 16 October 2026. Do not turn £21.71 into a price per litre while the two figures conflict.

How the six listings sit in that order

These bags show volume and wording. They are not a ranking. On 16 October 2026 the prices were Munnie £9.34, TerraGrade £10.99, Growmoor 60 L £13.98, Growmoor 2 × 60 L £21.71, Growmoor 180 L £30.00, and Laeto £41.63. Cheap helps only after the material and the litres fit. TerraGrade, under the ecoblaze name, is the only listing whose bullets name raised beds. It does not prove a seven-three-two mix, and it does not make the bag peat-free.

Common questions

Is multi-purpose compost the same as a raised bed mix?
No. Multi-purpose compost is a potting medium. The RHS mix is seven parts topsoil, three parts organic matter, and two parts sharp sand. The bag can be that organic share, or a fill for pots. Ready soil-and-compost mixes exist from other sellers, and they are not in this set.
How many litres does my bed need before I count bags?
Multiply inside length, width, and depth in metres by 1,000. A bed of 1.2 m by 0.6 m by 0.30 m is 216 litres for the whole fill. Three of those twelve parts are compost, which is 54 litres. Count bags against 54 litres, not against the empty frame.
What must the bag say if I want peat-free?
It must say peat-free. Munnie's line, "enabling the reduction of the use of peat", only claims a reduction. If those words are absent, treat the bag as not peat-free. None of these six titles uses them, so read the product text before you rely on it.
Why do the Growmoor 2 × 60 L title and the 60 litre field disagree?
The title reads as 120 litres. The volume field says 60 litres, beside two packs, 22 kg, and £21.71. That does not show whether the order is 120 litres or a 60 litre unit sold as a pair. Skip the listing until the title and the spec agree.
Is a 60 litre bag enough for a vegetable bed?
It can cover the 54 litre compost share of the 216 litre example, with a little spare. It cannot fill the bed. The other 162 litres are topsoil and sand. A bed of compost alone will slump, which is why the RHS points you to soil as the main fill.
When do I need topsoil instead of another bag of compost?
When the bed is new, or the gap is the seven parts of topsoil rather than a thin top-up. Extra compost bags are easier to carry, and they still shrink. Use topsoil for the bulk and compost for the three-part share, unless you are only refreshing the surface of a bed that already holds soil.

Related pages

Which bag suits which job

Raised bed compost

How to fill a raised bed: RHS depth, parts and litres

Peat-free compost for raised beds and the words that count

Compost vs topsoil for raised beds: which share to buy

Sources

Public UK sources for the mix, peat wording and sale-of-goods rules. Listing prices and review counts are amazon.co.uk figures from 16 October 2026.

  1. RHS: How to make a raised bed (retrieved 16 October 2026)
  2. RHS: Growing veg in raised beds (retrieved 16 October 2026)
  3. RHS: Peat-free for gardeners (retrieved 16 October 2026)
  4. GOV.UK: Sale of horticultural peat to be banned (retrieved 16 October 2026)
  5. Defra written answer, 19 March 2026 (retrieved 16 October 2026)
  6. BSI PAS 100:2018, specification for composted materials (retrieved 16 October 2026)
  7. GOV.UK: Use of manufactured topsoil (RPS 190) (retrieved 16 October 2026)
  8. Consumer Rights Act 2015, section 11 (retrieved 16 October 2026)