Peat-Free Compost Explained

If you've bought a bag of compost lately, you've almost certainly bought peat-free — and you might be wondering whether it's as good as the old stuff. The short answer: yes, modern peat-free works well, it just behaves a little differently. Here's what's changed and how to get the best from it.

Why peat is being phased out

For decades, bagged multipurpose compost was based on peat dug from bogs. It was cheap and reliable to grow in — but the environmental cost is severe.

Peat bogs are one of our most important habitats. They lock away enormous amounts of carbon, far more per hectare than woodland, and they're home to specialised wildlife you find nowhere else. Digging peat for compost releases that stored carbon and destroys the bog, which takes thousands of years to form. It simply doesn't grow back on any human timescale.

That's why the UK is phasing peat out of gardening compost. Sales of peat to home gardeners are being ended, and most major retailers and brands have already switched. So this isn't a niche eco choice any more — peat-free is just what compost is now.

The good news is that the modern recipes have come a long way. Early peat-free bags from years ago earned a poor reputation; today's are a different product entirely.

How peat-free is different

Peat-free composts are blended from materials like wood fibre, composted bark, coir and green compost. They grow plants perfectly well, but they don't hold water the same way peat did, so two habits are worth adjusting.

Watering. Peat-free tends to dry on the surface while staying moist underneath. If you water only when the top looks dry, you'll overwater. Instead, push a finger 2–3cm in and water by feel. Containers especially can look bone-dry on top and be damp at the roots — our guide to growing food in containers covers this in more detail.

Feeding. Many peat-free mixes hold their nutrients for a slightly shorter window, and the wood fibre can briefly tie up nitrogen as it breaks down. In practice that means starting a liquid feed a little sooner — from around four to five weeks after potting on, rather than waiting six. Hungry crops like tomatoes will tell you quickly if they're short.

It's also worth knowing that peat-free can be lumpier and more variable bag to bag. For fine seed sowing, sieve it first or buy a dedicated peat-free seed compost, which is milled finer for good germination.

Getting the best from it

A few small tweaks and peat-free will reward you:

• Buy fresh and store dry. Compost that's sat out in the rain or baked in the sun goes downhill. Buy from a shop with decent turnover and keep opened bags sealed and under cover.
• Match the mix to the job. Use a seed compost for sowing, multipurpose for potting on, and a coarser, loam-based mix for long-term containers and shrubs.
• Water little and often. Once peat-free dries right out it can be slow to re-wet. Keep it evenly moist rather than letting it swing between soaked and dust-dry.
• Top up the goodness. Mix in your own home-made compost or a slow-release feed for crops that are in their pots all season.
• Don't panic about lumps. A bit of bark or fibre is normal and fine for most planting — only sieve it where you genuinely need a fine tilth.

For choosing the right bag for each crop, our guide to the best compost for vegetables breaks down the options.

Reliable brands

You don't need to overthink this — most well-known UK ranges are now peat-free and perfectly good. As a rough guide, the more you pay, the more consistent the bag tends to be, and a premium peat-free is worth it for seed sowing and pricey plants.

Look for clear "peat-free" labelling (now the norm), pick a multipurpose for general use, and add a finer seed compost if you're starting plants from scratch. Buying the right couple of bags is covered in our starter buying guide, alongside the rest of the kit a beginner actually needs.

Switching to peat-free costs the bogs nothing and your plants barely notice. Water by feel, feed a touch sooner, and you'll grow just as well as ever.