The Best Peat-Free Compost for Houseplants in the UK

The move away from peat has been a quiet but important shift in UK horticulture. Peat extraction from upland bogs has damaged some of the most carbon-rich landscapes in Britain, and peat-free compost is now the default on most retail shelves. The trouble is that not all peat-free composts behave the same in a pot. Mixes that break down and compact quickly starve aroids of the air their roots need.

The picks below are ranked by what each is best at. They’re research-led: we’ve compared what the manufacturers say about ingredients, nutrients, and intended use, and checked UK prices, rather than running a side-by-side growing trial.

Best Overall — Dalefoot Wool Compost for Potting

Dalefoot Wool Compost for Potting is farm-made in the Lake District from British sheep’s wool, bracken, and comfrey — no green waste, no manure, Soil Association approved for organic growing.

The wool is the structural idea. Dalefoot says its hygroscopic wool fibres improve soil structure and increase water retention, and that the wool releases nitrogen slowly as it breaks down; comfrey adds potassium, phosphorus, and nitrogen. Dalefoot claims twelve months of feed without extra fertiliser — far longer than the 4–6 weeks of typical bagged composts.

One thing to know: Dalefoot sells it for pots, tubs, and containers, not as a houseplant mix, and it holds water — so open it up with perlite and bark for aroids, and don’t use it neat for succulents. At £12.99 for a 30-litre bag direct (around 43p a litre, less in bulk), it’s the cheapest per litre in this list, provided you can use 30 litres. Full review: Dalefoot Wool Compost for Potting.

Best Small-Bag Houseplant Mix — SylvaGrow Houseplant Compost

Melcourt makes more than one peat-free line, and SylvaGrow Houseplant belongs to its separate Indoor Range: a blend of fine bark and wood fibre with coir, in a resealable 5-litre bag. Melcourt names Monstera, spider plant, Philodendron, and peace lily among the plants it’s for. It’s RHS-endorsed and won the Growing Materials category at Glee 2025.

It carries nutrients for the first 4–6 weeks, after which Melcourt recommends a liquid feed. Per litre it’s dearer than Dalefoot — around £1.20–£2.20 — but for a handful of repots, a small resealable bag is less outlay and less waste than a 30-litre sack. Full review: SylvaGrow Houseplant Compost.

Best for Aroids — Soil Ninja Aroid Bundle

Aroids — Monstera, Philodendron, Anthurium, Pothos — want a chunky, airy substrate where roots can breathe between waterings, which no general-purpose compost delivers on its own.

Soil Ninja’s Aroid Bundle gives you the parts to build one: 10 litres of its Base Mix (coco coir, perlite, and worm castings), plus 5 litres each of coarse pumice, coarse zeolite, and fine bark, making around 30 litres of substrate. It isn’t pre-mixed — Soil Ninja supplies a ratio guide and encourages you to adjust the blend to your plants and conditions. At £34 it’s a premium over mixing from garden-centre components, and it was sold out on Soil Ninja’s site when we checked; the Base Mix is also sold on its own (around £8.50 for 10 litres).

Best All-Rounder — SylvaGrow Multi-Purpose Peat-Free

SylvaGrow Multi-Purpose is Melcourt’s general peat-free compost: fine bark, wood fibre, and coir, with no peat or green waste, RHS-endorsed, and made in the UK. Melcourt lists house plants among its uses alongside seed sowing, containers, and hanging baskets. It’s sold widely in 15- and 40-litre bags; a 40-litre bag costs around £8–£12 at UK garden centres.

Like the Houseplant mix, it carries nutrients for the first 4–6 weeks. It’s a sensible base for a collection where houseplants aren’t your only use for compost, and the obvious base for the DIY mix below. If houseplants are your only use, the purpose-made SylvaGrow Houseplant is the more targeted choice.

Best Cactus & Succulent — SylvaGrow Desert Plant

Succulents and cacti want the opposite of what aroids want: fast drainage and little water held around the roots. A standard compost — even a peat-free one — can kill them by staying wet.

SylvaGrow Desert Plant is Melcourt’s mix for them: fine bark, sterilised loam, and grit, in a 5-litre bag, RHS-endorsed, at around £7–£11. Melcourt names aloe, snake plant, and bunny ears cactus among the plants it’s for. Whatever cactus mix you buy, the thing to look for is grit: if it looks dark and spongy when you open the bag, add more grit or perlite.

DIY Custom Mix — Base + Perlite + Bark

For larger collections, the most flexible route to a good aroid substrate is to make your own. A common starting recipe:

• 2 parts peat-free multi-purpose compost (SylvaGrow or similar)
• 1 part horticultural perlite
• 1 part orchid bark (medium-grade composted pine bark)
• Optional: a handful of worm castings

The advantage is that you can adjust the ratios per species — more perlite for hoyas, more bark for orchids, more coir-based compost for ferns. The trade-off is time, storage, and buying the components separately. For one or two repots a year, a ready-made mix is simpler; for a big spring repotting session, mixing your own makes sense. The potting mix guide covers the ratios in more detail.

What to skip

Judging compost by the “peat-free” label alone. Peat-free tells you what isn’t in the bag, not how it will behave in a pot. Check the ingredients and what the manufacturer says it’s for.

Adding feed to fix a poor substrate. If your compost is compacting and holding water poorly, more nitrogen won’t help — the problem is structural, not nutritional. Repot into a properly aerated mix.

How we chose

These picks are research-led. We compared the manufacturers’ published information — ingredients, nutrient duration, intended uses, bag sizes — against what houseplants in pots need, and checked UK prices in October 2026. We haven’t grown plants in these composts side by side, and we don’t claim to have. See how we review.

For the underlying soil biology and why aerated substrate matters, see the houseplant science hub. For mix ratios by species, see the potting mix guide.

Sources

• Dalefoot Composts: Wool Compost for Potting, home page.
• Melcourt: SylvaGrow Houseplant, SylvaGrow Multi-Purpose, SylvaGrow Desert Plant, Glee 2025 award.
• Soil Ninja: Aroid Bundle.
• UK prices checked October 2026: House Home & Garden, Fargro, Aylett Nurseries, Crocus, Botanic York.

Correction, October 2026: an earlier version of this page described growing trials we had not carried out, misnamed the Dalefoot, Soil Ninja, and Melcourt cactus products, and gave out-of-date bag sizes and prices. It has been rewritten from manufacturers’ published information. See how we review.