Garden care

Best multi-purpose compost for pots and beds compared in 2026

Compost bags vary more than you might expect, from 60L multi-purpose sacks to a compressed block that expands to 10L. This roundup compares five options for pots and beds by volume, stated use, added materials or feeding features, planting focus and price, so you can see which one fits the job and your budget.

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Our Top Pick

Best overall

Munnie's 60L bag costs £11.99 and covers a wide range of uses, making it a good balance of volume, versatility and price.

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Compost compared by volume, use and added features

Product	Brand	Price	Retailer	Bag size or expanded volume	Stated use	Added material or feeding	Planting focus
Pelle & Sol Multi-Purpose Compost, 40L	Pelle & Sol	£9.99Checked 6 Nov 2026, 17:00 UTC	Amazon UK	40L	Indoor and outdoor pots, seeds, seedlings, herbs and vegetables	Vermiculite; moisture retention and drainage feature	All-purpose potting and seed compost
Munnie Multi-Purpose Compost, 60L	Munnie	£11.99Checked 6 Nov 2026, 17:00 UTC	Amazon UK	60L	Indoor and outdoor plants, vegetables, flowers, shrubs and trees	Vermiculite; reduced-peat use claim	Seeds, pots, baskets and window boxes
Hardys Multi-Purpose Compost, 60L	Hardys	£14.95Checked 6 Nov 2026, 17:00 UTC	Amazon UK	60L	Houseplants, garden use, seeds, cuttings and soil improvement	Slow-release fertiliser feature	All-season indoor and outdoor use
Westland No.3 John Innes Mature Plant Compost, 30L	Westland	£10.99Checked 6 Nov 2026, 17:00 UTC	Amazon UK	30L	Mature plants	Feeds for 5 weeks; nutrient-rich	Westland No.3 John Innes compost
GreenBrokers C1001 Organic All-Purpose Potting Compost	GreenBrokers	£7.21Checked 6 Nov 2026, 17:00 UTC	Amazon UK	Compressed; expands to 10L	Indoor and outdoor pots	Peat-free; enriched with plant food and micro-nutrients	Compact all-purpose potting compost

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Multi-purpose compost compared

Best mid-size bag

Pelle & Sol Multi-Purpose Compost, 40L

A 40L bag at £9.99 aimed at pots, seedlings, herbs and vegetables, with vermiculite added.

This 40L bag costs £9.99 and is described as suitable for indoor and outdoor pots, seeds and seedlings, and herbs and vegetables. The product details mention added vermiculite for moisture retention and drainage. It sits between the 30L and 60L bags in size, so it suits smaller jobs where a full 60L sack would be more than needed. It is a multi-purpose mix rather than a mature-plant compost.

Price£9.99Checked 6 Nov 2026, 17:00 UTC

Key Details

Bag size or expanded volume: 40L
Stated use: Indoor and outdoor pots, seeds, seedlings, herbs and vegetables
Added material or feeding: Vermiculite; moisture retention and drainage feature
Planting focus: All-purpose potting and seed compost

What We Like

Includes added vermiculite for moisture retention and drainage
Stated use covers seedlings, herbs and vegetables

Considerations

Less compost per bag than the 60L options

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Best overall

Munnie Multi-Purpose Compost, 60L

A large 60L bag at £11.99 with a broad range of uses and a reduced-peat mix.

At £11.99 for 60L, this is the best value among the full-size bags. Stated uses run from seed germination and window boxes to baskets, pots, vegetables, flowers, shrubs and trees, indoors or out. The product details mention added vermiculite and reduced peat use. That mix of volume, wide stated use and price makes it a practical choice for anyone filling several pots and beds.

Price£11.99Checked 6 Nov 2026, 17:00 UTC

Key Details

Bag size or expanded volume: 60L
Stated use: Indoor and outdoor plants, vegetables, flowers, shrubs and trees
Added material or feeding: Vermiculite; reduced-peat use claim
Planting focus: Seeds, pots, baskets and window boxes

What We Like

60L for £11.99, with a wide range of stated uses
Described as using added vermiculite and reduced peat

Considerations

Costs £2 more than Pelle & Sol for 20L more compost

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Best with added feed

Hardys Multi-Purpose Compost, 60L

A 60L bag at £14.95 that adds slow-release fertiliser to a multi-purpose mix.

This 60L bag costs £14.95 and is described as suitable for houseplants and gardens, seed sowing, potting, rooting cuttings and soil improvement. The product details mention non-recycled organic matter and slow-release fertiliser. It is the priciest option, so it may suit gardeners who want that feeding feature in a large bag. Its broad stated use makes it a match for several kinds of planting.

Price£14.95Checked 6 Nov 2026, 17:00 UTC

Key Details

Bag size or expanded volume: 60L
Stated use: Houseplants, garden use, seeds, cuttings and soil improvement
Added material or feeding: Slow-release fertiliser feature
Planting focus: All-season indoor and outdoor use

What We Like

Product details describe slow-release fertiliser
Stated uses include rooting cuttings and soil improvement

Considerations

Highest price at £14.95 for 60L

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Best for mature plants

Westland No.3 John Innes Mature Plant Compost, 30L

A 30L John Innes No.3 compost at £10.99, aimed at mature plants rather than general sowing.

This is a John Innes No.3 compost, a different type from the multi-purpose mixes here, and it is aimed at mature plants. The 30L bag costs £10.99 and is described as nutrient-rich, feeding for five weeks. It suits established planting rather than seed sowing, so it works as a specialist option alongside a general compost. Its smaller volume also makes it the priciest per litre of the full bags.

Price£10.99Checked 6 Nov 2026, 17:00 UTC

Key Details

Bag size or expanded volume: 30L
Stated use: Mature plants
Added material or feeding: Feeds for 5 weeks; nutrient-rich
Planting focus: Westland No.3 John Innes compost

What We Like

John Innes No.3 mix aimed at mature plants
Described as feeding for five weeks

Considerations

Smallest full bag at 30L
Less general-purpose than the multi-purpose mixes

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Best compact peat-free option

GreenBrokers C1001 Organic All-Purpose Potting Compost

A £7.21 compressed block that expands to 10L, offering a peat-free mix enriched with plant food.

Sold as a compressed block that expands to 10L, this is the lowest-priced option at £7.21. It is described as peat-free and enriched with plant food and micronutrients, for indoor and outdoor use. The final volume is much smaller than the other bags, so the cost per litre is higher. It suits small jobs and anyone wanting a peat-free choice that is easy to store.

Price£7.21Checked 6 Nov 2026, 17:00 UTC

Key Details

Bag size or expanded volume: Compressed; expands to 10L
Stated use: Indoor and outdoor pots
Added material or feeding: Peat-free; enriched with plant food and micro-nutrients
Planting focus: Compact all-purpose potting compost

What We Like

Lowest price at £7.21
Peat-free and enriched with plant food and micronutrients

Considerations

Expands to 10L, the smallest volume here
Needs expanding before use

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