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How to use peat-free compost

Updated: October 2026

You have opened a new bag, filled a pot and found that the pale surface looks dry by the following afternoon. The next step is not automatically more water. To use peat-free compost well, check moisture below the surface, water slowly when the root zone needs it, and begin feeding only when that bag's stated nutrient window ends. Our [peat-free soil comparison](/hub/fertiliser-soil-and-bark-mulch/peat-free-soil) records the products and feed claims. This guide runs from opening the bag through watering, feeding and storing what remains.

You have opened a new bag, filled a pot and found that the pale surface looks dry by the following afternoon. The next step is not automatically more water.

Our top picks

Lechuza Lechuza Basicpon peat-free 6 L

Best overall

Lechuza Lechuza Basicpon peat-free 6 L
9.6/10about £14.98
View offer
Miracle-Gro Miracle-Gro peat-free all purpose 20 L

Rank 2

Miracle-Gro Miracle-Gro peat-free all purpose 20 L
9.0/10about £7.95
View offer
Levington Levington peat-free multipurpose 40 L

Best value

Levington Levington peat-free multipurpose 40 L
8.8/10about £9.99
View offer
On this page
  1. 1.Open the bag and fill the pot
  2. 2.Water by feel, not by colour
  3. 3.Feed when the bag says the charge runs out
  4. 4.Keep the rest of the bag usable

Open the bag and fill the pot

Open bagged compost outdoors or in a well-ventilated place. Wear gloves, keep your face away from the opening and avoid breathing dust. Public Health Scotland gives these precautions because compost can rarely carry Legionella. If the contents are dusty, dampen them lightly rather than shaking the bag, then wash your hands. Break up lumps, but leave the wood fibre. Bark, coir and wood fibre are normal. Pick out only a stick that stops the root ball sitting properly. Use a pot with open drainage holes, set the root ball at its previous level, and firm the mix gently. Leave roughly a couple of centimetres below the rim. Water once after potting and let the excess drain. A compressed block such as DIVCHI is the exception: add water and wait for it to expand, because rushed wetting leaves dry patches. If you have not chosen a bag yet, start with the peat-free compost buying guide.

Water by feel, not by colour

Peat-free compost can look pale on top while the roots are still moist. Push a finger in. For a deeper pot, the RHS suggests about a third of the way down. You can also learn how much lighter a small pot feels as it dries. Pour slowly, pause so the mix can take the water up, and stop before it streams out of the drainage holes for a long time. RHS nursery research did not find that peat-free media automatically need more water than peat. A windy basket can dry quickly. A large shaded pot may stay wet under a pale surface. If water runs around a dry plug, add a little, wait, and repeat. If the pot stays heavy and the plant wilts, the roots may be too wet. Seed trays are covered in peat-free compost for seeds.
Lechuza Lechuza Basicpon peat-free 6 L

Testsieger

Lechuza Lechuza Basicpon peat-free 6 L
9.6/10about £14.98
View offer

Feed when the bag says the charge runs out

Read the bag, not a generic timetable. Levington states eight weeks, Houseplant Focus up to two months, and Miracle-Gro up to three months. Those are listing claims. Do not add a full-strength feed on potting day because some general advice says three or four weeks. When the stated window ends, use a feed suited to the plant and follow its dilution. Check water and roots before you treat fertiliser as the cure. Basicpon is fertiliser-free, so feeding starts with the system. PON gives no week count. For seedlings, wait for true leaves and a dilute feed. Do not use tomato feed on newly germinated seedlings as a default.

Keep the rest of the bag usable

Fold or reseal the opened bag so rain, pests and weed seeds cannot enter. Keep it cool, dry and ventilated, out of direct sun, and use it in the season you bought it where you can. Structure and the nutrient charge become less predictable in long storage. A few small mushrooms can be pinched off, and an earthy smell is not a reason to discard the bag. Contact the seller if the whole bag smells chemical, contains obvious foreign material, or has a widespread problem. Do not spread leftover potting compost as a thick mulch. It is formulated for containers. A small used quantity may go into garden soil, or follow your local green-waste arrangements.

Common questions

Does peat-free compost need more water?
Not automatically. Different peat-free formulations hold and release water differently, and RHS nursery research did not find that peat-free media always needed more irrigation. Check below the surface with a finger or lift the pot. Water the root zone when needed, not because the top has turned pale.
When should I start feeding?
Use the product's stated window. The listings here range from eight weeks for Levington to up to three months for Miracle-Gro, while Basicpon is fertiliser-free. Begin an appropriate feed when that charge is expected to end, unless the plant's own guidance requires a different approach.
Can I use last year's open bag?
You may be able to use a clean, correctly stored bag, but structure and nutrients are less predictable after long storage. Inspect it for contamination, pests and waterlogging, and avoid relying on its original feed claim. Fresh compost is the safer choice for valuable plants and seed sowing.
Why are there twigs in the mix?
Wood fibre and bark are normal peat alternatives, so some fibrous material is expected. Remove a piece that obstructs a small pot or root ball, but do not sieve out all structure. If a large proportion is coarse debris and the product is unusable, photograph it and contact the seller.
Is compost safe to open indoors?
Outdoor or well-ventilated opening is safer. Wear gloves, keep your face away from the bag and avoid inhaling dust. Lightly dampen dusty material rather than creating a cloud, then wash your hands. Seek medical advice if you become unwell after significant compost-dust exposure.
Can I use leftover potting compost as mulch?
Potting compost is not designed as a surface mulch, and the RHS advises against using it that way. Keep a usable remainder sealed for container work, incorporate a small used quantity appropriately into soil, or follow your council's green-waste guidance.

Related pages

Peat-free soil for houseplants

Peat-free soil

The best peat-free compost for pots, baskets and tubs

How to choose peat-free compost for your pots and beds

Peat-free seed compost when the bag is multipurpose

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the eight amazon.co.uk listings stored with this comparison. A feed window, a free-draining line or a water-and-air ratio is the seller's claim, not an independent test. Peat compost is still legal to sell.

  1. Defra, sale of horticultural peat to be banned (retrieved October 2026)
  2. Peat Free Partnership, legislation timeline (retrieved October 2026)
  3. Deposited letter DEP2026-0072, 29 January 2026 (retrieved October 2026)
  4. RHS, peat-free compost choices (retrieved October 2026)
  5. RHS, ten peat-free tips (retrieved October 2026)
  6. RHS, peat-free irrigation (retrieved October 2026)
  7. Public Health Scotland, gardening safely (retrieved October 2026)
  8. WRAP, growing media specification (retrieved October 2026)