Start with a container and the right materials

A compost system needs three things: a container (or designated space), brown materials (dry leaves, shredded paper, cardboard), and green materials (food scraps, grass clippings, plant trimmings). You do not need to buy anything expensive—a wooden bin, plastic storage container with holes drilled in the bottom, or even a corner of your yard works. The container just needs to let air and water move through the pile.

Layer your materials as you add them: roughly two parts brown to one part green. Brown materials are carbon-rich and help the pile stay loose so air can reach the center. Green materials are nitrogen-rich and feed the microorganisms that break everything down. If you add only green materials, the pile becomes a wet, smelly mess. If you add only brown, decomposition slows to almost nothing.

Start your pile by putting down a 4- to 6-inch layer of brown material on the bottom. Then add a 2- to 3-inch layer of green material. Repeat this pattern as you collect scraps. Water the pile as you build it—it should feel like a wrung-out sponge, not soggy and not bone-dry.

Key Takeaways

  • Layer brown materials (leaves, cardboard, paper) with green materials (food scraps, grass) at roughly a 2-to-1 ratio to keep the pile balanced and decomposing.
  • Keep the pile as moist as a wrung-out sponge and turn it every week or two if you want finished compost in two to three months, or leave it undisturbed for six to twelve months.
  • Never add meat, dairy, oils, pet waste, or diseased plants, as these either attract pests or spread problems to your garden.
  • Finished compost looks like dark, crumbly soil and smells earthy; use it to amend garden beds, potted plants, or lawn.

What you can and cannot compost

Safe to compost: fruit and vegetable scraps, coffee grounds and tea bags, crushed eggshells, grass clippings, leaves, shredded newspaper and cardboard, wood chips, straw, hay, plant trimmings, and sawdust from untreated wood. These materials break down without creating problems.

Never compost: meat, fish, bones, dairy products, oils and fats, pet waste, diseased plants, weeds with seeds, and glossy or colored paper. Meat and dairy attract rats and raccoons. Oils slow decomposition. Pet waste can harbor pathogens. Diseased plants and mature weeds spread problems to your garden beds when you use the finished compost.

Cooked food scraps are safe to compost as long as they contain no meat, dairy, or oil. Bread, pasta, rice, and vegetable scraps all break down fine. If you are unsure about something, err on the side of leaving it out—the pile works better when you stick to plant material and paper.

Turning the pile versus letting it sit

You have two paths: active composting (turning the pile regularly) or passive composting (leaving it alone). Active composting finishes in two to three months if you turn the pile every week or two with a pitchfork or shovel. Turning mixes materials, brings oxygen to the center, and speeds decomposition. Passive composting takes six to twelve months but requires almost no work—you just add materials and wait.

If you turn the pile, water it lightly after each turn. The pile heats up as microorganisms work, and you may see steam rising on cool mornings. This heat is normal and means decomposition is happening fast. If the pile smells like ammonia or rotten eggs, it is too wet or too green—add brown material and turn it more often.

If you leave the pile alone, it will still decompose, just more slowly. Moisture from rain and the materials themselves keeps it damp enough. You can add to a passive pile year-round without disrupting the process. This method works well if you have space and patience but limited time for maintenance.

Managing moisture and temperature

The pile needs steady moisture to decompose. In dry weather, water it as you would a garden bed—enough that water drips from the bottom but not so much that it becomes waterlogged. In wet weather, a cover (plywood, a tarp, or a bin lid) keeps excess rain out. Too much water drives out oxygen and creates anaerobic conditions, which smell terrible and slow decomposition.

Temperature matters less than people think. Compost works in cold weather, just slower. A pile in full sun heats up faster than one in shade, but shade keeps it from drying out as quickly. If you live somewhere very hot and dry, shade and a cover help. If you live somewhere cold, a bin with insulated sides or a location against a south-facing wall helps retain warmth.

You do not need to monitor temperature with a thermometer. If the pile is warm to the touch in the center, decomposition is active. If it feels cool and nothing seems to be breaking down after several months, add more green material and turn it more often.

Recognizing finished compost and using it

Finished compost looks like dark brown or black crumbly soil. You should not be able to identify the original materials—leaves, scraps, and cardboard are all broken down into uniform texture. It smells earthy and pleasant, like forest floor. If you can still see recognizable pieces or it smells sour, it is not ready yet. Let it sit another month or two.

Use finished compost to amend garden beds (mix it into the top 6 inches of soil), fill containers for potted plants, top-dress your lawn, or blend it into potting soil for starting seeds. A typical garden bed benefits from 1 to 2 inches of compost worked in each year. Container plants can be filled with a mix of finished compost and other soil amendments.

Store finished compost in a bin or pile covered with a tarp to keep it from getting waterlogged. It stays usable for months or longer. If you have more than you can use, offer it to neighbors or local gardeners—most people are happy to take it.

Troubleshooting common problems

Pile smells like ammonia or rotten eggs: Too much green material or too much moisture. Add brown material (leaves, cardboard, shredded paper) and turn the pile. Reduce watering or add a cover to shed rain.

Pile is not heating up or decomposing: Not enough green material, too dry, or too cold. Add food scraps or grass clippings, water it, and turn it more often. In winter, decomposition slows naturally—this is normal.

Pests (rats, raccoons, flies): You are composting meat, dairy, or oils, or the pile is not covered. Remove those materials when ready and cover the pile with a lid or hardware cloth. Bury food scraps under at least 6 inches of brown material so they are not visible on the surface.

Pile is soggy and not draining: The bottom is not getting air. If using a bin, drill or poke holes in the bottom and sides. If composting on the ground, lay down a layer of sticks or coarse material first so air can flow underneath.

Choosing a bin or container

A wooden bin (made from untreated wood or pallets) is cheap, straightforward to build, and lets air flow through. It lasts a few years before the wood rots. A plastic bin with a lid and drainage holes is compact and keeps pests out, but smaller piles decompose slower because they do not heat up as much. A tumbler (a rotating barrel on a stand) speeds decomposition and makes turning straightforward, but costs more and holds less material. An open pile on the ground works fine if you have space and do not mind pests—just turn it regularly and cover it with a tarp in heavy rain.

For most home gardeners, a straightforward wooden bin or a plastic storage container with holes drilled in it works well. Size matters less than consistency—a smaller bin you actually use beats a large one you neglect. Start with whatever you have or can build cheaply, and upgrade later if you want.

Frequently Asked Questions

How long does it take to get finished compost?

Two to three months if you turn the pile weekly and keep it balanced and moist. Six to twelve months if you leave it alone. The exact time depends on pile size, material mix, temperature, and how often you turn it. Smaller piles decompose slower because they do not retain heat as well.

Can I compost in winter?

Yes. Decomposition slows in cold weather, but it does not stop. Keep adding materials and turning occasionally if you want faster results. A pile that is actively decomposing generates its own heat and can stay warm enough to work even in freezing temperatures. Passive piles just take longer to finish.

What if I do not have a yard?

You can compost in a small bin on a balcony or patio. Use a plastic tumbler or a 5-gallon bucket with a lid and drainage holes. Add materials in smaller quantities and turn more often. Finished compost from a small bin works just as well for potted plants and containers.

Do I need to add compost starter or microorganisms?

No. Microorganisms are already in the materials you add—especially in soil, leaves, and grass clippings. A healthy pile does not need anything added. If your pile is not decomposing, the problem is usually moisture, air, or material balance, not missing microbes.

Can I use compost that still has chunks in it?

Yes, if the chunks are small and soft enough to break apart by hand. Larger pieces of wood or cardboard can be pulled out and added to a new pile. Partially finished compost still improves soil, though fully finished compost works better because it is more stable and easier to mix in evenly.