Composting at Home
Compost turns kitchen and yard waste into the best soil amendment you can make. A simple pile or bin, balanced "greens" and "browns," and patience are all it takes.
Greens and browns
Greens (veggie scraps, grass) supply nitrogen; browns (leaves, cardboard, wood) supply carbon. Aim roughly 1:2 or 1:3 and keep it moist like a wrung sponge.
Bins and systems
A basic bin costs little; tumblers speed things up; vermicomposting (worms) works indoors. Use the estimator to budget your setup.
Use it
Finished compost is dark, crumbly, and earthy. Mix into beds and containers to improve structure, water retention, and nutrients.
Building a pile that actually heats up
A compost pile works when three things are present at once: the right carbon-to-nitrogen balance, enough moisture, and enough air. Volume matters more than most guides admit — a small pile loses heat faster than the microbes generate it, so building a heap of roughly a cubic yard is the point at which decomposition accelerates noticeably. Alternate layers of greens and browns rather than mixing them into a slurry, keep the material as damp as a wrung-out sponge, and turn the pile when it cools to introduce oxygen and move the outer material into the hot core. A working pile heats up within a few days and then cools; that cycle is the signal to turn it.
What to keep out
Meat, fish, dairy, and oily cooked food should stay out of an open pile because they attract rodents and create odour; they are only appropriate in a sealed, rodent-proof system. Pet waste from dogs and cats carries pathogens that a home pile does not reliably destroy. Weeds that have already set seed, and diseased plant material such as blighted foliage, survive typical home composting temperatures and simply return the problem to your beds — a hot pile can handle them, a passive one cannot. Also keep out anything treated, painted, or plastic, and be cautious with glossy printed paper and dryer lint.
Troubleshooting by smell and look
The pile tells you what it needs. A sour, ammonia-like smell means too much nitrogen and too little carbon or air — add browns and turn it. A rotting, sewage-like smell means the pile has gone anaerobic, usually from excess moisture or compaction: turn it, add coarse browns, and let it dry slightly. A pile that simply sits and does nothing, staying cool and unchanged, is usually too dry, too small, or too short of nitrogen — add greens, water it, and increase the volume. Fruit flies mean exposed kitchen scraps; bury them in the centre of the pile.
When it is finished, and how to use it
Finished compost is dark, crumbly, and smells earthy rather than rotten, and the original materials are no longer recognisable — a well-managed pile gets there in a few months, a passive one in six to twelve. You do not need it fully finished for every use, but it does matter where you put it: fully finished compost can go in seed-starting mixes, while partly finished material is better used as a mulch on top of beds, where it will continue breaking down without competing with young roots for nitrogen. Apply it as a top-dressing or mix it into the top few inches of soil rather than digging it deep, because that is where the biological activity you are feeding actually lives.
Compost as a habit, not a project
The reason home composting succeeds or fails is rarely technique and almost always convenience. Put the collection container where the scraps are generated, keep a source of browns close enough that adding a handful is easier than not, and size the system to what your household actually produces rather than to what looks impressive in a catalogue. A modest bin that gets turned occasionally and used every season returns far more to your garden than an elaborate three-bay setup that is abandoned by midsummer. If you would rather not manage a pile at all, vermicomposting a small bin of kitchen scraps indoors handles a household’s vegetable waste with almost no odour and no turning.
Garden Cost Estimator (compost bin)
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