Start with the right location and container
Pick a spot that gets partial sun — not full shade, not baking heat all day. A corner of your yard that sees four to six hours of sunlight works well. The pile needs air flow around it, so keep it away from fences or walls that trap moisture.
You can build directly on bare ground, which lets worms and microbes move in from below. Or use a container: a wooden bin made from untreated wood, a wire cylinder, a plastic tumbler, or even a large plastic storage tub with holes drilled in the sides. The container keeps things tidy and speeds decomposition by holding heat, but it is not required. A free-standing pile works fine if you have the space.
Size matters less than you think. A pile smaller than three feet by three feet by three feet will decompose slowly because it does not retain enough heat. Anything larger than five feet by five feet becomes hard to turn and manage. Start with three by three by three feet as your target.
Key Takeaways
- Layer brown materials (dry leaves, straw, shredded paper) and green materials (grass clippings, food scraps, plant trimmings) in a ratio of roughly three parts brown to one part green by volume.
- Keep the pile as moist as a wrung-out sponge — wet enough to feel damp but not so wet that water drips out when you squeeze it.
- Turn the pile every one to two weeks if you want finished compost in two to three months, or leave it alone for six to twelve months for passive decomposition.
- Avoid meat, dairy, oils, and pet waste, which attract pests or introduce pathogens that survive in home compost.
- You will know compost is ready when it looks dark brown, crumbly, and earthy, with no recognizable food scraps or leaves remaining.
Layer browns and greens in the right proportion
Brown materials are dry and carbon-rich: fallen leaves, straw, shredded newspaper, cardboard, wood chips, and sawdust. Green materials are moist and nitrogen-rich: grass clippings, vegetable scraps, coffee grounds, plant trimmings, and manure.
The microbes that break down compost need both. A rough target is three parts brown to one part green by volume. If your pile smells like ammonia or looks slimy, you have too much green — add more brown. If it is not heating up or breaking down, you probably have too much brown — add more green or water.
Start your pile with a four- to six-inch layer of brown material on the bottom. This creates air pockets. Then add a two-inch layer of green. Alternate layers until your pile reaches three feet tall. Do not worry about perfect ratios — close is good enough, and you can adjust as you go.
Get the moisture right
Compost microbes need water to work, but too much water blocks air and creates rot instead of decomposition. The target is the moisture of a wrung-out sponge: damp throughout, but no water dripping out when you squeeze a handful.
When you first build the pile, water each layer lightly as you add it. Check the pile once a week by pushing your hand into the center. If it feels dry, water it until it is damp again. If it feels soggy, stop watering and turn the pile to add air.
Rain will add water naturally. In dry climates or during dry spells, you may need to water every few days. In wet climates, you may need to cover the pile with a tarp to prevent it from becoming waterlogged.
Turn the pile to speed decomposition
Turning the pile mixes materials, adds oxygen, and speeds the breakdown process. If you turn every one to two weeks, you can have usable compost in two to three months. If you never turn it, decomposition still happens — it just takes six to twelve months.
To turn the pile, use a pitchfork or shovel to move material from the outside of the pile to the center, and material from the center to the outside. The goal is to move cooler, less-decomposed material toward the hot center where microbes are most active. You do not need to be precise — rough mixing is enough.
If turning feels like too much work, skip it. A passive pile that sits undisturbed will eventually become compost. You will just wait longer. Many people find the trade-off worth it: no work, but patience required.
What to put in and what to keep out
Safe to add: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, plant trimmings, fallen leaves, straw, hay, shredded newspaper and cardboard, wood chips, sawdust, and herbivore manure (horse, cow, rabbit, chicken).
Do not add: meat, fish, bones, dairy, oils, fats, pet waste (dog or cat), diseased plants, weeds with seeds, or glossy or colored paper. Meat and dairy attract rats and raccoons. Pet waste carries pathogens. Diseased plants spread disease to your garden. Weeds with seeds will sprout when you use the compost.
Cooked food scraps are safe to add — the heat of the pile kills most pathogens. Onions, garlic, and citrus peels are fine in small amounts, though some people avoid them because they can slow decomposition slightly.
Recognize when compost is ready to use
Finished compost looks dark brown or black, crumbly, and earthy. You should not be able to recognize individual food scraps or leaves. It smells like soil, not like rotting garbage. When you squeeze a handful, it holds together loosely but falls apart easily.
If you turned the pile regularly, it may be ready in two to three months. If you left it alone, expect six to twelve months. The only way to know for sure is to look inside. If you still see recognizable scraps or leaves, let it sit longer.
You can use partially finished compost — it will not hurt your plants, though it may still contain some unbroken material. Many gardeners sift finished compost through a screen to remove chunks and use those chunks to start a new pile.
Troubleshoot common problems
Pile smells like ammonia or rotten eggs: Too much green material or too wet. Add brown material (leaves, straw, shredded paper) and turn the pile to add air. Stop watering until it dries out slightly.
Pile is not heating up or breaking down: Too much brown material, too dry, or too small. Add green material (grass, food scraps), water it, and make sure the pile is at least three feet by three feet. If it is smaller, the microbes cannot generate enough heat.
Pests are getting into the pile: You are adding meat, dairy, or oils. Remove those materials and bury food scraps under at least six inches of brown material. A closed bin or tumbler keeps pests out better than an open pile.
Pile is not breaking down after a year: Check moisture and brown-to-green ratio. A dry pile or one with too much brown will decompose very slowly. Add water and green material, then turn it.
Frequently Asked Questions
Can I use a compost tumbler instead of a pile?
Yes. A tumbler is a sealed bin on a stand that you rotate to mix the contents. It keeps pests out, works faster than a pile (because rotation adds air), and takes up less space. The trade-off is cost — tumblers run $100 to $400 — and capacity. A tumbler holds less material than a three-by-three-foot pile, so you may fill it more slowly.
How long does it really take to get finished compost?
If you turn the pile every one to two weeks and keep moisture and materials balanced, two to three months. If you turn it less often, four to six months. If you never turn it, six to twelve months or longer. Temperature matters too — compost breaks down faster in warm weather than in cold.
Can I add sawdust from treated wood?
No. Treated wood contains chemicals that can persist in compost and harm plants. Use only sawdust from untreated wood, or skip it and use leaves or straw instead.
What if I do not have space for a full three-by-three-foot pile?
A smaller pile will work, but decomposition will be slower because it does not retain heat as well. A two-by-two-foot pile or a plastic tumbler are good alternatives for small spaces. You can also use a large plastic storage tub with holes drilled in the bottom and sides.
Can I add weeds to my compost?
Yes, if they have not gone to seed. Once weeds have flowers or seed heads, skip them — the seeds often survive composting and will sprout in your garden. Pull weeds before they flower and bury them under brown material in the pile.