Start with a container and the right location

You need three things to begin composting: a container, a location that gets some air circulation, and a mix of materials. The container can be a purpose-built bin, a wooden box you build yourself, a wire cylinder, or even a pile on the ground — what matters is that it holds material in one place and lets air reach it. A 3-by-3-foot space is a practical minimum size; anything smaller heats up unevenly and takes longer to break down.

Place your bin or pile in a spot that gets partial sun and drains well. Full sun can dry out your pile too fast; full shade slows decomposition. Avoid placing it directly against your house or fence, because the moisture and smell can damage wood. If you live in a wet climate, elevate the bin slightly or add drainage holes so water does not pool at the bottom.

Key Takeaways

  • A compost bin needs brown materials (dry leaves, straw, shredded paper) and green materials (food scraps, grass clippings, plant trimmings) in roughly equal amounts by volume.
  • Layer your materials as you add them, alternating brown and green, rather than dumping everything at once.
  • Keep the pile as moist as a wrung-out sponge and turn it every one to two weeks if you want finished compost in two to three months, or leave it alone for six to twelve months.
  • Never add meat, dairy, oils, or diseased plants; these either attract pests or spread plant diseases to your garden.
  • Finished compost looks dark, crumbly, and earthy and has no recognizable food scraps or leaves in it.

Gather brown and green materials in the right ratio

Compost works because microorganisms break down organic matter, and they need the right balance of carbon-rich materials (called "browns") and nitrogen-rich materials (called "greens"). Browns include dry leaves, straw, shredded newspaper, cardboard, and wood chips. Greens include grass clippings, vegetable scraps, coffee grounds, plant trimmings, and manure from herbivores like horses or chickens.

Aim for roughly equal volumes of brown and green material — not a precise ratio, but close enough that you are not building a pile that is mostly one or the other. 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 breaking down after several weeks, you likely need more green material or more moisture.

Chop or shred larger materials before adding them. A whole leaf takes longer to decompose than a shredded one; a whole carrot takes longer than a chopped one. You do not need a shredder — a lawn mower run over a pile of leaves, or a knife for vegetable scraps, works fine.

Layer materials as you add them

Do not dump all your materials in at once. Instead, build the pile in layers: a few inches of brown, then a few inches of green, then brown again. This mixing as you go helps air and moisture reach all parts of the pile and speeds up decomposition. If you are adding scraps daily, you can straightforward toss them in and cover them with a layer of brown material — leaves or shredded paper — to keep pests away and reduce smell.

Keep track of what you add so you know roughly what is in your pile. If you have been adding mostly grass clippings for two weeks, your next additions should be brown material to balance it out.

Manage moisture and air

Your pile should feel like a wrung-out sponge — moist but not dripping. If it is too dry, decomposition slows or stops. If it is too wet, it becomes anaerobic (without oxygen) and smells like rotten eggs. Add water when you turn the pile if it feels dry, or cover it during heavy rain if it is getting soggy.

Air is equally important. Microorganisms that break down compost need oxygen. If you turn the pile every one to two weeks with a pitchfork or shovel, moving material from the outside to the center, you speed decomposition to two to three months. If you leave the pile alone and let it sit, decomposition takes six to twelve months but requires no work. Both methods produce finished compost; the difference is time and effort.

Know what not to add

Never add meat, fish, bones, dairy, oils, or fats — these attract rats and other pests and create foul smells. Do not add diseased plants, because the compost pile may not get hot enough to kill the disease, and you will spread it to your garden. Avoid pet feces and diseased animal manure; use only manure from herbivores like horses, chickens, or rabbits.

Do not add glossy or colored paper, because the inks and coatings can contain harmful chemicals. Shredded newspaper and plain cardboard are fine. Avoid weeds that have gone to seed, because seeds can survive the composting process and sprout in your garden later.

Recognize finished compost and use it

Finished compost is dark brown or black, crumbly, and smells earthy — like soil after rain. You should not be able to recognize individual food scraps, leaves, or other materials in it. If you still see chunks of material, the pile needs more time. Sift it through a half-inch screen or straightforward pick out the larger pieces and return them to a new pile.

Use finished compost in your garden beds, vegetable garden, or potted plants. Mix it into the top few inches of soil, or use it as mulch around plants. You can also brew it into compost tea by soaking finished compost in water for a day or two, then straining and using the liquid to water plants. There is no waste — compost improves soil structure, adds nutrients, and helps soil hold water.

Choose a bin style that fits your space and effort level

A wire cylinder is the cheapest option — roll chicken wire or hardware cloth into a circle, find it with wire or zip ties, and you have a bin. It is open on top and sides, so turning is straightforward, but it dries out faster and may not contain material as neatly.

A wooden box made from untreated wood or pallets holds material better and looks neater. It takes a few hours to build but costs little. Avoid treated wood, which can leach chemicals into your compost.

A plastic bin or commercial composter is the most compact and tidy option. It keeps pests out better and retains moisture well, but turning is harder because you have to open a lid or door. Some designs have a door at the bottom so you can remove finished compost without opening the top.

A straightforward pile on the ground costs nothing and works fine if you have space and do not mind the appearance. It is the easiest to turn and the fastest to build, but it spreads out more and may attract pests if not managed carefully.

Frequently Asked Questions

How long does it take to get finished compost?

If you turn the pile every one to two weeks and keep it moist and balanced, you can have finished compost in two to three months. If you leave it alone, it takes six to twelve months. The time depends on pile size, material type, temperature, and how often you turn it.

Can I compost in an apartment or small space?

Yes. A small bin on a balcony or patio works, though you will need to be careful about smell and pests. A sealed plastic bin with a tight-fitting lid is your best option. You can also use a bokashi bucket, which ferments food scraps in a sealed container using special bran, then you bury the fermented material in a garden or potted plant.

Why does my compost smell bad?

A rotten-egg smell means the pile is too wet or too dense and lacks oxygen. Turn it and add brown material. An ammonia smell means too much green material; add more brown. A normal compost pile should smell earthy, not foul.

Can I compost sawdust or wood chips?

Yes, but use only untreated wood. Sawdust from pressure-treated lumber or plywood contains chemicals that will contaminate your compost. Hardwood sawdust breaks down slowly; softwood is faster. Mix it with green material and be patient.

What if I have too much finished compost?

Share it with neighbors, friends, or community gardens. Use it in potted plants, on your lawn, or in raised beds. You can also store it in bags or bins for use later in the season — finished compost keeps for months if kept dry.