The basic method: layer, water, and wait
Making compost means stacking kitchen scraps and yard waste in a pile or bin, keeping it moist and turned occasionally, and letting microbes and insects break it down into dark, crumbly soil. You do not need special equipment, chemicals, or a large space. A corner of your yard, a wooden bin, or even a sealed container on a balcony will work. The process takes anywhere from two months to a year depending on how often you turn the pile and what you put in it.
The basic recipe is straightforward: alternate layers of nitrogen-rich materials (food scraps, grass clippings, plant trimmings) with carbon-rich materials (dry leaves, shredded paper, wood chips). Keep the pile as moist as a wrung-out sponge. Turn it every week or two if you want finished compost in two to three months, or leave it alone and wait six to twelve months for the same result.
Key Takeaways
- Layer green materials (food scraps, grass) with brown materials (leaves, paper) in a ratio of roughly one part green to two parts brown by volume.
- Keep the pile moist like a wrung-out sponge and turn it every one to two weeks to speed decomposition, or skip turning and wait longer.
- Avoid meat, dairy, oils, and diseased plants, which attract pests or spread disease to your garden.
- Finished compost is dark, crumbly, and smells earthy; it takes two months to a year depending on your method and climate.
- You can start composting in a straightforward wooden bin, a plastic tumbler, a wire cage, or even a pile on bare ground.
What goes in: the green and brown balance
Green materials are nitrogen-rich and include fruit and vegetable scraps, coffee grounds and tea bags, fresh grass clippings, plant trimmings, and manure from herbivores (horse, rabbit, chicken). These materials heat up the pile and feed the microbes that do the breaking down. They decompose quickly on their own but can smell bad and attract pests if they are not balanced with brown material.
Brown materials are carbon-rich and include dry leaves, shredded newspaper or cardboard, wood chips, straw, and sawdust. These materials provide structure, slow decomposition to a manageable pace, and prevent the pile from becoming a wet, smelly mess. Aim for roughly twice as much brown as green by volume—so if you add a bucket of food scraps, add two buckets of leaves or shredded paper on top.
Chop or shred larger items before adding them. A food scrap the size of your fist will decompose faster than a whole apple. Shredded leaves and cardboard break down quicker than whole leaves or cardboard sheets. The smaller the pieces, the faster the microbes can work.
What to keep out of your compost
Meat, fish, bones, and dairy will decompose, but they attract rats, raccoons, and flies. Oils and fats slow decomposition and can create a water-resistant layer in the pile. Diseased plants and weeds with seeds can survive the composting process and spread problems to your garden later. Pet waste (especially from cats and dogs) may contain pathogens harmful to food gardens.
Avoid glossy or colored paper, which may contain inks or coatings that do not break down cleanly. Pressure-treated wood, coal ash, and charcoal briquette ash contain substances that can harm plants. Plain cardboard, newspaper, and wood ash from a fireplace are safe. If you are unsure whether something will compost, leave it out—the pile will work fine without it.
Building and maintaining your pile
Start with a layer of brown material four to six inches deep on bare ground or in a bin. Add a layer of green material two to three inches deep. Repeat until the pile is three to four feet tall, finishing with a brown layer on top. Water each layer as you build so the whole pile is moist but not soggy. If you are building all at once, water the finished pile thoroughly.
Check the moisture level every few days by squeezing a handful of compost. If water drips out, it is too wet—add more brown material. If it crumbles and does not hold together, it is too dry—add water or green material. The pile should feel like a wrung-out sponge.
If you turn the pile every one to two weeks with a pitchfork or shovel, moving material from the outside edges to the center, you will have finished compost in two to three months. If you do not turn it, the pile will still decompose but will take six to twelve months. Turning speeds the process because it brings cooler material from the edges into the hot center where decomposition happens fastest.
Different composting methods for different spaces
Pile on the ground: The simplest method. Lay materials directly on bare soil, which allows worms and insects to move in from below. No bin needed. Takes longer because turning is harder, but costs nothing.
Wooden bin: Build or buy a three-sided or four-sided box from untreated wood, typically three to four feet on each side. Allows good airflow and is straightforward to turn. Lasts five to ten years before the wood rots.
Plastic tumbler: A sealed barrel on a stand that you turn by rotating the barrel itself. Faster decomposition because it heats up more, and no pests can get in. Takes up less space. More expensive upfront but lasts many years.
Wire cage: Chicken wire or hardware cloth formed into a cylinder and staked to the ground. Cheap and straightforward. Allows good airflow but offers no pest protection and is harder to turn.
Enclosed bin: A plastic or metal container with a lid and sometimes a door at the bottom for removing finished compost. Keeps out pests and rain. Slower decomposition because less air reaches the center, but good for small spaces or urban areas.
Knowing when your compost is ready
Finished compost is dark brown or black, crumbly, and smells earthy—like soil after rain. You should not be able to recognize the original materials. If you can still see food scraps or leaves, the pile needs more time. If the pile still smells like ammonia or rotten food, it is not done.
You can use compost that is not completely finished—some gardeners add partially decomposed material directly to garden beds in fall and let it finish breaking down over winter. But fully finished compost is easier to spread, does not tie up nitrogen as it continues to decompose, and looks more like soil.
Sift finished compost through a half-inch screen or hardware cloth if you want to remove chunks and use it for potting mix or seed starting. Unsifted compost works fine for amending garden beds and containers.
Troubleshooting common problems
Pile smells like ammonia or rotten eggs: Too much green material or not enough air. Add brown material and turn the pile more often. If it is in a sealed bin, drill more holes or switch to an open bin.
Pile is wet and slimy: Too much moisture or not enough brown material. Stop adding water, add shredded leaves or cardboard, and turn it to bring dry material from the edges to the center.
Pile is not heating up or decomposing: Too much brown material, too little green, or pieces are too large. Chop materials smaller, add more food scraps or grass clippings, and turn the pile to mix materials together.
Pests are getting in: Meat, dairy, or oils in the pile attract them. Remove those materials and bury food scraps under at least six inches of brown material. Use a covered bin or tumbler if pests are a persistent problem.
Frequently Asked Questions
Can I compost in winter?
Yes, but decomposition slows dramatically in cold weather. A pile built in fall will sit mostly dormant until spring, then resume breaking down. In mild climates, composting continues year-round. If you want compost during winter, use a sealed tumbler in a sunny spot, which heats up more than an open pile.
Do I need to add compost starter or microbes?
No. Microbes and insects are already present in soil, leaves, and food scraps. A handful of finished compost or garden soil added to a new pile can speed things up slightly, but it is not necessary. The pile will decompose on its own.
Can I compost paper and cardboard?
Yes. Shred or tear newspaper, cardboard, and plain paper into pieces and layer them with green material. Avoid glossy, colored, or coated paper. Cardboard breaks down faster if you wet it and shred it first.
What if I do not have space for a compost pile?
A sealed tumbler takes up about three square feet. A small wooden bin can fit in a corner. Even a five-gallon bucket with a lid and drainage holes works for small amounts of scraps, though it takes longer. Vermicomposting (composting with worms in a bin indoors) is another option for apartments or small spaces.
Can I use compost from diseased plants in my vegetable garden?
Not safely. Some plant diseases survive the composting process, especially if the pile does not heat up enough. Compost from diseased plants is better used on ornamental plants or kept separate. If you are unsure whether a plant was diseased, err on the side of caution and do not use that compost on food crops.