Start with the right container and location
You can make compost in a bin, a pile, or even a tumbler — the method depends on your space and how fast you want finished compost. A bin keeps things tidy and contained; a pile takes up more room but needs less maintenance; a tumbler speeds up the process by letting you rotate materials regularly. All three work. Choose a spot that gets partial shade (full sun can dry things out too fast) and has decent drainage so water doesn't pool at the bottom.
If you are building a bin from scratch, a straightforward wooden or wire frame works well. You can also buy a plastic bin with a lid, drill holes in the sides and bottom for air flow, and set it on soil rather than concrete so organisms can move in and out. The size matters less than you might think — even a 2-foot cube will compost, though larger piles heat up faster and break down materials quicker.
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 keep the pile balanced.
- Keep the pile as moist as a wrung-out sponge and turn it every two to four weeks if you want finished compost in two to three months, or leave it alone for six to twelve months for a slower process.
- Avoid meat, dairy, oils, and diseased plants, which attract pests or spread problems through your garden.
- Finished compost looks dark brown, crumbly, and earthy, with no recognizable food scraps or leaves remaining.
Layer browns and greens in the right ratio
Brown materials are dry and carbon-rich: fallen leaves, straw, shredded newspaper, cardboard, wood chips, and sawdust. Green materials are wet and nitrogen-rich: grass clippings, vegetable scraps, coffee grounds, plant trimmings, and manure. The goal is roughly equal parts by volume — not by weight, which confuses people. A good rule is to add a few inches of brown, then a few inches of green, then repeat.
If your pile smells like ammonia or rotten eggs, you have too much green. Add more brown material and mix it in. If your pile is not heating up and seems to be just sitting there, you probably need more green to feed the microbes that do the work. Start with a 1:1 ratio and adjust based on what you see.
Shred or chop materials before adding them — smaller pieces break down faster because microbes have more surface area to work with. You do not need a shredder; a lawn mower run over leaves works, or you can chop vegetable scraps with a knife.
Keep moisture and air at the right levels
The pile should feel as moist as a wrung-out sponge — damp but not dripping. If it is too dry, microbes slow down and nothing happens. If it is waterlogged, it smells bad and anaerobic bacteria take over, which is slower and messier. Water the pile when you add materials if it looks dry, and check it every week or two by squeezing a handful.
Air is just as important as moisture. Microbes that break down compost need oxygen. If you are using a bin or pile, turn it with a pitchfork or shovel every two to four weeks — flip the outside material toward the center so everything gets mixed and aerated. If you have a tumbler, rotate it a few times a week. If you are willing to wait longer (six to twelve months instead of two to three), you can skip turning and let it decompose passively, though it will be slower.
What to add and what to avoid
Safe to add: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, plant trimmings, leaves, straw, hay, shredded paper and cardboard, wood chips, sawdust, and herbivore manure (horse, cow, chicken, rabbit). Avoid glossy or colored paper, which may contain chemicals.
Do not add: meat, fish, bones, dairy, oils, fats, diseased plants, weeds with seeds, pet waste, or treated wood. Meat and dairy attract rats and raccoons. Diseased plants spread problems to your garden. Weeds with mature seeds will survive composting and spread when you use the finished product. Pet waste can harbor parasites harmful to humans.
Citrus peels, onions, and garlic can be added but use them sparingly — they slow decomposition slightly. Bread and grains are fine but may attract pests if not buried under other materials.
Monitor temperature and timeline
A healthy, actively managed pile heats up noticeably — you may see steam rising on cool mornings. This heat is a sign that thermophilic bacteria are breaking down materials fast. The center of the pile can reach 130 to 150 degrees Fahrenheit. This heat also kills many weed seeds and pathogens, which is why hot composting is preferred for gardeners worried about disease.
If you turn the pile every two to four weeks and keep it moist and balanced, you can have usable compost in two to three months. If you turn it less often or not at all, expect six to twelve months. The slower method is less work but takes longer. Both produce good results.
You do not need a thermometer to know if things are working — just watch for the pile shrinking (materials breaking down) and smell. A good compost pile smells earthy, like forest floor. If it smells sour or like ammonia, adjust the ratio or add air.
Know when compost is ready to use
Finished compost is dark brown or black, crumbly, and smells earthy. You should not see recognizable food scraps, leaves, or straw — everything has broken down into a uniform texture. If you can still identify what went in, it is not ready yet. Sift it through a half-inch screen if you want a finer product, or use it as-is if you do not mind small pieces.
You can use finished compost right away in garden beds, mixed into potting soil, or as a mulch around plants. It does not need to cure or rest. Store extra compost in a bin or pile covered with a tarp to keep it from getting waterlogged over winter.
Troubleshooting common problems
If your pile is not heating up, it is usually too dry, too small, or lacks enough green material. Add water, combine it with another pile to reach critical mass, or add grass clippings or food scraps. If it smells bad, turn it more often and add brown material. If pests are getting in, bury food scraps under at least six inches of brown material and avoid meat and dairy.
If your pile is wet and slimy, it has too much moisture and not enough air. Turn it more often, add brown material, and let it dry out slightly. If it is taking longer than expected, the pile may be too small or the materials too large — chop things finer and add more green material to speed things up.
Frequently Asked Questions
Can I compost in winter?
Yes, but it will be slower. Microbes work more slowly in cold weather. If you live somewhere with freezing winters, you can keep adding materials to a pile and let it sit until spring, when it will heat up and break down faster. Alternatively, move the pile to a sheltered spot or insulate it with straw or leaves to keep it warmer.
Do I need special tools to make compost?
A pitchfork or shovel for turning is helpful but not required. You can turn a pile with a regular spade or even by hand if it is small enough. A thermometer is nice but not necessary — your nose and eyes tell you most of what you need to know. A screen for sifting finished compost is optional.
Can I compost in an apartment or small space?
Yes. A small bin or tumbler on a balcony or patio works fine. You can also use a bokashi bucket, which ferments food scraps in a sealed container and produces material you can bury in a garden bed or potted plant. Bokashi is faster and odor-controlled but requires special bran and produces a different product than traditional compost.
How much compost will I end up with?
Materials shrink significantly as they break down — typically to about one-third their original volume. A pile that starts at three feet tall and wide may yield one foot of finished compost. The exact amount depends on what you put in and how long you let it sit.
Can I use compost from diseased plants in my garden?
Only if your pile reached and held 130 degrees Fahrenheit for at least two weeks, which kills most pathogens. If you are unsure your pile got hot enough, do not use it on plants that had the same disease. It is safer to avoid composting diseased material altogether if you are new to composting.