Start with the right location and container
You can compost in a pile on the ground, in a wooden bin, a plastic tumbler, or even a wire cage — the method matters less than having a spot that stays reasonably moist and gets some air circulation. Choose a level patch of bare soil or grass in a spot that gets partial sun (full sun can dry things out too fast, and full shade slows decomposition). If you live in a wet climate, slightly raised ground helps prevent waterlogging.
A straightforward bin is straightforward to build from untreated wood pallets or scrap lumber, roughly 3 feet by 3 feet by 3 feet — that size holds enough material to generate heat while staying manageable. If you prefer not to build, a plastic tumbler or wire bin works just as well and takes up less space. The key is that air can reach the pile from the sides or bottom, not that it has a fancy structure.
Key Takeaways
- Layer brown materials (dry leaves, straw, shredded paper) and green materials (grass clippings, food scraps, plant trimmings) in roughly equal amounts by volume to speed decomposition.
- Keep the pile as moist as a wrung-out sponge — wet enough to break down but not so wet that it smells or attracts pests.
- Turn the pile every two to four weeks if you want finished compost in two to three months, or leave it undisturbed for six to twelve months for slower decomposition.
- Never add meat, dairy, oils, or pet waste; these attract pests or introduce pathogens that home compost does not get hot enough to kill.
- Finished compost looks dark brown, crumbly, and earthy-smelling — you should not see the original materials anymore.
Layer browns and greens in the right ratio
Brown materials are dry and carbon-rich: fallen leaves, straw, shredded newspaper or cardboard, wood chips, and sawdust. Green materials are moist and nitrogen-rich: grass clippings, vegetable and fruit scraps, coffee grounds, plant trimmings, and fresh manure from herbivores like horses or chickens. The microbes that break down compost need both, and the ratio matters.
Aim for roughly equal volumes of brown and green — a 4-inch layer of leaves, then a 4-inch layer of grass clippings, then leaves again. If your pile smells like ammonia or looks slimy, you have too much green; add more brown material. If it is not heating up and decomposing after a few weeks, you likely have too much brown; add more green or water it down.
Start your pile by laying down a 6-inch base of coarse brown material like sticks or wood chips — this creates air pockets at the bottom. Then alternate layers of brown and green until the pile is at least 3 feet tall. A pile smaller than that does not generate enough heat to decompose quickly.
Keep moisture and air at the right levels
The pile should feel like a wrung-out sponge — moist throughout but not dripping. If it is too dry, decomposition slows to a crawl. If it is too wet, it becomes anaerobic (lacking oxygen), which creates a foul smell and attracts flies. Check the moisture by squeezing a handful of material from the middle of the pile; if water drips out, it is too wet. If nothing comes out, it is too dry.
Water the pile during dry spells, especially in summer. A soaker hose or watering can works fine — you are not trying to flood it, just keep it consistently damp. In wet climates, you may need to cover the top with a tarp or lid to prevent it from becoming waterlogged.
Air circulation matters just as much as moisture. If you are turning the pile regularly (every two to four weeks), you are adding air each time. If you are leaving it undisturbed, make sure the bin has openings on the sides or bottom so air can flow through naturally. A pile with no air flow will eventually decompose, but it will smell bad and take much longer.
Turn the pile to speed up decomposition
Turning means moving material from the outside of the pile to the center, where it is hottest. This exposes new material to heat and microbes, breaks up compacted sections, and adds oxygen throughout. If you turn every two to four weeks, you can have usable compost in two to three months. If you never turn it, decomposition still happens but takes six to twelve months or longer.
To turn a pile, use a garden fork or shovel to move material from the edges toward the center, working your way around. You do not need to be precise — the goal is to mix things up and expose the cooler outer material to the hot center. After turning, the pile will heat up again within a few days as microbes get back to work.
If turning feels like too much work, you do not have to do it. A static pile (one you never turn) will decompose on its own; it just takes longer. Some people use a tumbler, which you rotate by hand or crank, and that mixes the pile without the heavy lifting of a fork.
Recognize what you can and cannot compost
Safe to compost: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, leaves, straw, hay, shredded paper and cardboard, wood chips, plant trimmings, and manure from herbivores (horses, chickens, rabbits). Cooked vegetables are fine; raw is not necessary.
Never compost: meat, fish, bones, dairy, oils, fats, pet waste (dog or cat), diseased plants, weeds with seeds, or glossy/colored paper. Meat and dairy attract rats and raccoons. Pet waste can harbor pathogens. Diseased plants and seeded weeds spread problems to your garden. Oils and fats slow decomposition and can create odors.
Citrus peels, onions, and garlic can compost but may slow decomposition or repel worms if added in large amounts — use them in moderation. Pine needles and walnut leaves are acidic and decompose slowly, so chop them finely or mix them with plenty of other material.
Know when compost is finished and ready to use
Finished compost is dark brown or black, crumbly, and smells earthy — like forest soil. You should not see the original materials (leaves, grass, scraps) anymore; they have broken down into a uniform texture. If you can still identify what went in, it is not ready yet.
The easiest test is the touch test: squeeze a handful. Finished compost crumbles apart easily. If it is still clumpy or wet, give it more time. Another sign is temperature: finished compost is cool to the touch, while active compost is warm or hot from microbial activity.
You can use compost that is not perfectly finished — some gardeners use it at six months — but it will continue to break down slightly in the soil. If you want to be certain, wait until the pile has cooled completely and the material is uniform throughout, which usually takes at least eight to twelve weeks after the last turn.
Troubleshoot common problems
Pile smells like ammonia or rotten eggs: This means too much nitrogen (green material) or not enough air. Add brown material like leaves or shredded paper, and turn the pile to add oxygen. If it is waterlogged, add coarse brown material and consider covering it to shed rain.
Pile is not heating up: Either it is too small (less than 3 feet tall), too dry, or has too much brown material. Add more green material, water it, and make sure it is at least 3 feet on all sides. A small pile may never get hot enough to decompose quickly; consider combining it with another pile or waiting longer.
Flies or maggots in the pile: You likely added meat, dairy, or oil, or the pile is too wet. Stop adding those materials, let the top dry out slightly, and bury food scraps deeper in the pile under brown material. Turning the pile also helps — the heat kills fly larvae.
Rodents or raccoons digging in: Meat, dairy, or oil attracts them. Remove those materials and bury food scraps deep under brown material. A bin with a lid or sides that close helps; a bare pile is harder to protect.
Frequently Asked Questions
How long does it really take to make compost?
If you turn the pile every two to four weeks and keep it moist and balanced, you can have finished compost in two to three months. If you leave it alone without turning, expect six to twelve months or longer. The exact time depends on temperature (faster in warm weather), pile size, and how finely you chop the materials going in.
Can I compost in winter?
Yes, but decomposition slows dramatically in cold weather. A pile will still break down, but it may take twice as long or longer. In very cold climates, many people stop adding to their pile in fall and let it sit until spring. You can insulate the pile with straw or leaves to retain some heat.
Do I need to add compost starter or microbes?
No. Microbes are already present in soil, leaves, and grass clippings. A compost starter product is not necessary and does not speed things up meaningfully. A healthy pile with the right moisture, air, and balance of materials will decompose on its own.
What if I do not have space for a big pile?
A tumbler or small bin works fine — it just takes longer because the pile is smaller and does not generate as much heat. You can also use a worm bin (vermicomposting) indoors or in a garage, though that requires different management. Even a small pile or bin is better than sending food scraps to the landfill.
Can I use compost that still has some chunks in it?
Yes. Compost does not have to be perfectly uniform. If most of it is dark and crumbly and you can see only a few recognizable pieces, it is ready to use. Those chunks will continue to break down in the soil. If it is mostly chunks and still looks like the original materials, give it more time.