Start with a bin, brown materials, and green materials
Making compost at home means layering two types of waste — brown materials (dry leaves, shredded paper, cardboard) and green materials (food scraps, grass clippings, plant trimmings) — in a container where they break down into dark, crumbly soil. You do not need special equipment or chemicals. A straightforward pile on the ground works. A plastic bin with a lid works better if you have limited space or want to keep pests out. 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 rule is straightforward: aim for roughly three parts brown to one part green by volume. Brown materials are carbon-rich and help the pile stay loose so air can reach it. Green materials are nitrogen-rich and provide the fuel that heats the pile and speeds decomposition. Without both, the pile either sits dormant or turns into a wet, smelly mess.
Key Takeaways
- Layer brown materials (leaves, paper, cardboard) and green materials (food scraps, grass) in a 3-to-1 ratio to create the right conditions for decomposition.
- 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.
- Avoid meat, dairy, oils, and pet waste, which attract pests or introduce harmful bacteria.
- Finished compost is dark brown, crumbly, and smells like soil; use it to improve garden beds, potted plants, or lawn.
What to put in and what to leave out
Safe to add: vegetable and fruit scraps (including peels and cores), coffee grounds and tea bags, crushed eggshells, grass clippings, leaves, shredded newspaper and cardboard, wood chips, straw, and plant trimmings. These materials break down reliably and do not create odor or pest problems.
Never add: meat, fish, bones, dairy products, oils and fats, pet waste, diseased plants, or weeds with seeds. Meat and dairy attract rats and raccoons. Oils slow decomposition. Pet waste can harbor pathogens. Diseased plants and seeded weeds spread problems to your garden.
Cooked food scraps are safe as long as they contain no meat, dairy, or oil. Glossy or colored paper should stay out — stick to plain cardboard and newspaper. Sawdust from treated wood is not safe; use only untreated wood chips or sawdust.
Building and maintaining your pile
Start with a layer of brown material about 4 inches deep — this creates air pockets at the base. Add a layer of green material about 1 to 2 inches deep. Repeat until the pile is at least 3 feet tall and 3 feet wide. A pile smaller than this does not retain heat well and decomposes slowly. If you are using a bin, fill it the same way.
Keep the pile as moist as a wrung-out sponge. If it is too dry, decomposition stalls. If it is too wet, it becomes anaerobic (oxygen-starved) and smells like rotten eggs. Water it during dry spells and turn it over with a pitchfork or shovel if the center feels soggy.
Turning the pile every one to two weeks speeds the process significantly — you can have finished compost in two to three months. If you do not turn it, the pile will still decompose, but it takes six to twelve months. Either approach works; turning is faster but requires more effort.
Choosing a bin or building an open pile
An open pile costs nothing and works well if you have space and do not mind the appearance. Pests can access it more easily, and rain can wash nutrients away, but many gardeners accept this trade-off. Place it on bare soil so worms and microorganisms can move in from below.
A plastic bin with a lid (18 to 32 gallons) keeps pests out and looks neater. It is slower than an open pile because it holds less material and retains less heat, but it works for small households. Drill or cut air holes in the sides and bottom for drainage and airflow.
A wooden pallet bin costs $20 to $50 to build and offers a middle ground — more capacity than a plastic bin, easier access than an open pile, and good airflow. Stack four pallets into a square, find the corners with wire or bolts, and line the inside with hardware cloth to keep rodents out.
A tumbling composter (a drum on a stand that you rotate) speeds decomposition and keeps pests out, but costs $100 to $300 and works best if you have a steady supply of materials to add all at once.
Knowing when your compost is ready
Finished compost is dark brown or black, crumbly, and smells like rich soil or forest floor. You should not be able to identify the original materials — no visible food scraps or leaves. If you squeeze a handful, it should hold together briefly, then fall apart. If it is still wet and clumpy, it needs more time.
If you turned the pile regularly, you can harvest finished compost from the bottom of an open pile or tumbler while the top is still decomposing. With a static pile or bin, wait until the entire contents have darkened and broken down, which usually takes at least six months.
Sift the finished compost through a 1/2-inch screen to remove chunks and create a uniform texture. You can use the chunks in the next batch or leave them in the garden bed.
Using your finished compost
Mix finished compost into garden beds at a depth of 2 to 4 inches before planting. It improves soil structure, adds nutrients, and helps soil retain moisture. For potted plants, blend compost with existing potting soil at a ratio of one part compost to two parts potting soil. For lawns, spread a thin layer (1/4 to 1/2 inch) over the grass in fall or spring and let it settle into the thatch.
You do not need to wait for perfect, uniform compost. Even partially finished material with visible chunks will improve your soil. Many gardeners add it to the bottom of planting holes or use it as mulch around established plants.
Troubleshooting common problems
If your pile smells like ammonia or rotten eggs, it is too wet or has too much green material. Turn it, add brown material, and let it dry out. If it is not heating up or decomposing, it may be too dry, too small, or have too much brown material. Water it, add more green scraps, or combine it with another pile.
If you see flies, the pile is probably too wet or has exposed food scraps. Bury food scraps under at least 4 inches of brown material and improve drainage. If you see rodents, remove any meat or dairy you may have added and cover the pile with hardware cloth or a tight-fitting lid.
If the pile is not heating up after two weeks, the materials may be too coarse. Shred or chop large leaves and cardboard into smaller pieces so microorganisms have more surface area to work on.
Frequently Asked Questions
Can I compost in an apartment or small space?
Yes. A 5-gallon bucket with a lid and air holes works for small amounts of scraps. Bury food scraps under brown material, keep it moist but not wet, and turn it weekly. It will not produce large amounts of finished compost, but it reduces waste. Alternatively, use a small tumbling composter on a balcony or patio.
How long does it really take to get usable compost?
If you turn the pile weekly and maintain the right moisture and material balance, two to three months. If you do not turn it, six to twelve months. Cooler climates take longer than warm ones. Even partially finished compost with visible chunks is useful in gardens.
Do I need to add compost starter or microorganisms?
No. Soil, leaves, and finished compost already contain the microorganisms you need. Commercial starters are not necessary. If you want to speed things up, add a shovel of finished compost or garden soil to your new pile.
What if I do not have brown materials?
Shredded newspaper, cardboard, and wood chips are straightforward to find. Ask local coffee shops for used grounds, which are green material. Collect leaves in fall and store them in bags for year-round use. Straw and hay are available from garden centers or farm suppliers.
Can I compost diseased plants or weeds with seeds?
Not in a home pile. Compost piles do not get hot enough to kill all pathogens or weed seeds unless you turn them frequently and maintain high temperatures. Diseased plants and seeded weeds are safer in the trash or yard waste bin.