> ## Content Index > Fetch the complete content index at: https://fern.happychases.com/llms.txt > Use this file to discover other available public pages before exploring further. # Compost is a conversation, not a recipe - URL: https://fern.happychases.com/compost-is-a-conversation-not-a-recipe/ - Published: 2026-09-08T07:45:00.000Z - Updated: 2026-11-03T21:28:52.000Z - Description: I used to treat compost like a recipe: measure, turn, wait, worry. Years of heaps later, here’s why it’s better understood as a conversation with billions of tiny organisms, and how to listen. - Author: Ines Moreau - Tags: Garden When I started gardening, I treated compost like a recipe. Three parts this, one part that, turn every Thursday, wait twelve weeks. I measured. I took the temperature. I was a nervous cook with a very large pot of rotting vegetables, and I spent a whole year worrying that I was doing it wrong. Several heaps later, I’ve changed my mind. Compost isn’t a recipe. It’s a conversation with a community of billions of organisms, and your job is mostly to listen and adjust. Once I understood that, the whole thing got easier, and the results got better. This is what I’ve learned. ![Dark crumbly finished compost in a gardener’s hands](https://picsum.photos/seed/fern-compost-heap/1600/900) Finished compost should look like dark, crumbly chocolate cake. ## Start with the basic balance Every compost heap needs two kinds of material. “Greens” are wet, nitrogen-rich things: vegetable peelings, grass clippings, coffee grounds, fresh weeds. “Browns” are dry, carbon-rich things: autumn leaves, shredded cardboard, straw, torn-up egg boxes, and woody prunings. The usual rule of thumb is about two to three parts browns to one part greens by volume, and it’s a good place to start. But treat it as a starting point rather than a law. If the heap turns soggy and smelly, it needs more browns. If it’s dry and nothing seems to be happening, it needs more greens, or more water. The heap will always tell you which. ## Size and shape matter more than you think A heap that’s too small never warms up. If you want to make compost quickly, a pile of about a cubic metre gives the microbes enough mass to generate their own heat, and a well-built hot heap can reach 55 to 65 degrees Celsius at its core. That heat does useful work: it speeds up decomposition and helps to break down many weed seeds. If you’d rather not build a big heap all at once, don’t worry. A smaller, cooler heap will still become compost. It’ll just take longer, usually six months to a year, and it won’t sterilise weed seeds. Both approaches are fine. Choose the one that fits your life, not the one that sounds the most impressive. ## Moisture and air The two things that determine whether a heap works are water and air. The ideal moisture level is often described as that of a wrung-out sponge: damp all the way through, but when you squeeze a handful, only a drop or two should appear. Too wet, and the air gets pushed out, so the heap goes anaerobic and smells like a drain. Too dry, and the microbes simply stop. Turning the heap adds air, and I turn mine every few weeks when I have the energy. When I don’t, I push a garden fork into it in several places and wiggle it about to make air channels. Putting a layer of coarse twigs at the bottom helps too, as it lets air flow in from underneath. ## What to put in, and what to leave out Plenty of things are welcome. Others will cause you trouble, or attract unwelcome visitors: - **Welcome:** vegetable and fruit scraps, coffee grounds and tea leaves (with the bags removed if they’re plastic), eggshells, leaves, grass clippings in thin layers, straw, shredded paper and plain cardboard. - **Use with care:** citrus peel and onions in large quantities, woody prunings (chop them small first), and weeds that have gone to seed. - **Leave out:** meat, fish, dairy and cooked food, which attract rats. Also pet waste, diseased plants, and the roots of persistent perennial weeds like bindweed or couch grass. For those persistent weeds, I drown them in a bucket of water for a few weeks until they turn into a foul-smelling sludge, which can then go into the heap safely. It isn’t pretty, but it works. ## Let your nose be the guide The smell is the best diagnostic tool you have. A healthy heap smells earthy and a bit sweet, like a forest floor after rain. If it smells of ammonia, there’s too much nitrogen, so add browns. If it smells of rotten eggs, it’s waterlogged and short of air, so turn it and add dry material. If there’s no smell at all and nothing is happening, it’s probably too dry. Over time, you’ll stop needing a checklist. You’ll lift the lid, take a look, and know what the heap needs. That intuition arrives faster than you’d expect, and it’s one of the real pleasures of the whole business. ## Don’t forget leaf mould Autumn is the perfect moment to mention leaf mould, which is compost’s slow, lazy cousin. Pile fallen leaves into a wire cage or a stout bin bag with a few holes punched in it, dampen them, and leave them alone for a year or two. The result is a beautifully fine, crumbly material that’s superb for improving soil structure and for sowing seeds into. It takes no skill at all, only time. ## Knowing when it’s ready Finished compost is dark, crumbly and smells pleasantly of earth. You shouldn’t be able to recognise what went into it, though a few woody bits and eggshell fragments often remain, and that’s fine. Sieve it if you want a fine finish for seed sowing, and put the coarse leftovers back in the heap to start the next batch. Use it as a top-dressing around plants, dig it into new beds, mix it into pots, or spread a couple of centimetres over the soil in autumn and let the worms do the work for you. The more you use, the more you’ll notice what it does for your plants. ## Relax The biggest lesson is that you can hardly fail. Soil has been making itself without human supervision for several hundred million years, and a heap of kitchen scraps in your garden is a small, enthusiastic part of that. Be curious rather than anxious. Make mistakes, smell the results, and adjust. A year from now, you’ll be holding a handful of something that wasn’t there before, made from things you’d otherwise have thrown away. There are few better feelings in the garden.