Start with a container and brown-to-green material in the right ratio

A small compost bin needs three things: a container, brown material (dry leaves, shredded paper, cardboard), and green material (food scraps, grass clippings, plant trimmings). The simplest setup is a plastic storage bin with a lid and holes drilled in the bottom and sides for air flow. You can also buy a ready-made bin from a garden centre, use a wooden pallet box, or even pile material directly on the ground if space allows.

Start by layering: put 4 to 6 inches of brown material on the bottom, then 4 to 6 inches of green material, then brown again. Keep the ratio roughly 3 parts brown to 1 part green by volume. Too much green (food scraps and grass) makes the bin smell and attract pests. Too much brown (leaves and paper) slows decomposition. The pile should feel like a wrung-out sponge — moist but not soggy.

Location matters. Place your bin in a spot that gets partial shade and is close enough that you will actually use it. Full sun can dry out the pile too fast. Too much shade slows the process. Near a water source is helpful because you may need to add moisture in dry months.

Key Takeaways

  • A basic compost bin is a plastic storage container with drainage holes, costing between $20 and $100 depending on size and material.
  • Layer brown material (leaves, paper, cardboard) with green material (food scraps, grass) in a 3-to-1 ratio to keep the pile balanced and odour-free.
  • Keep the pile moist like a wrung-out sponge and turn it every one to two weeks to speed decomposition to 2 to 6 months.
  • Avoid meat, dairy, oils, and pet waste; stick to vegetable scraps, coffee grounds, eggshells, and yard waste.

What to put in and what to keep out

Green materials that break down fast include vegetable and fruit scraps (no oils or dressing), coffee grounds and tea bags, grass clippings, and fresh plant trimmings. Brown materials that add carbon include dry leaves, shredded newspaper or cardboard (no glossy coating), straw, and wood chips. Eggshells and crushed seashells are fine and add minerals.

Never add meat, fish, bones, dairy, oils, fats, or pet waste. These attract rats and other pests, create strong odours, and can harbour harmful bacteria. Diseased plants and weeds with seeds should also stay out. Glossy or coloured paper, treated wood, and synthetic materials do not break down and will contaminate your finished compost.

Cooked food scraps are debated: some composters avoid them because they can attract pests, while others say a hot, well-maintained pile handles them fine. If you are new to composting, skip cooked food until you see how your bin behaves.

Turn the pile regularly to speed decomposition

Turning means mixing the pile with a garden fork or shovel every one to two weeks. This adds oxygen, which the microbes breaking down the material need to work fast. A turned pile can produce finished compost in 2 to 6 months. An unturned pile takes 6 months to a year or longer.

You do not have to turn it at all if you are patient — passive composting works, just slowly. But if you want compost ready for spring planting, turning every 10 to 14 days is the fastest home method. Wear gloves and avoid breathing dust when you turn.

You will know the pile is ready when the original materials are no longer recognizable, the texture is crumbly and dark brown, and it smells earthy rather than sour or rotten. At that point, stop adding new material and let it cure for another two to four weeks before using it in gardens or pots.

Manage moisture and temperature

The pile should stay moist but not waterlogged. If it smells like ammonia or rotten eggs, it is too wet — add brown material and turn it more often. If it is not heating up or breaking down, it is probably too dry — add water or green material. In summer, you may need to water once a week. In winter, rain usually provides enough moisture.

A healthy pile generates heat as microbes work. You may see steam rising on cool mornings, especially in the first few weeks. This is normal and means decomposition is happening fast. If the pile stays cold and nothing is breaking down, it usually means too much brown material or not enough moisture.

Choose a bin size and style that fits your space

A 3-by-3-foot bin (about 27 cubic feet) is the minimum size for a hot, fast pile. Smaller bins work but decompose more slowly because they do not retain heat as well. A 4-by-4-foot bin is ideal for a household that produces regular kitchen scraps and yard waste.

Plastic bins are cheap, portable, and straightforward to turn. Wooden bins look better and let air flow easily but rot over time and need replacing every 5 to 10 years. Metal bins heat up in sun and can get too hot. Tumbling bins (rotating drums on a stand) are convenient for turning but cost more and hold less material. A straightforward pile on the ground costs nothing but takes up space and is harder to manage.

If you rent or have limited space, a 5-gallon bucket with a lid and drainage holes works for small amounts of scraps, though it decomposes slowly. Some people keep one indoors under the sink to collect scraps, then empty it into the main bin weekly.

Troubleshoot common problems

If your bin smells bad, it is usually too wet or has too much green material. Add shredded paper or dry leaves, turn it, and reduce how often you add scraps. If pests are getting in, make sure the lid closes tight, bury food scraps under at least 6 inches of brown material, and avoid meat and dairy. A bin with a solid bottom (not open to the ground) also keeps out burrowing animals.

If nothing is decomposing after several weeks, the pile is probably too dry, too cold, or lacks enough green material to fuel the microbes. Add water, add fresh grass clippings or food scraps, and turn it. In winter, decomposition slows naturally — this is normal and not a problem.

If you see mold or fungus, that is fine — fungi are part of decomposition. If you see maggots, the pile is too wet and probably has meat or dairy in it. Add brown material, turn it, and check what you are putting in.

Frequently Asked Questions

How long does it take to get finished compost?

With regular turning every one to two weeks, finished compost is ready in 2 to 6 months. Without turning, expect 6 months to a year. Temperature, moisture, and the size of your materials all affect speed — smaller pieces break down faster than whole leaves or branches.

Can I compost in winter?

Yes, but decomposition slows significantly in cold weather. A pile started in fall may not finish until spring. Keeping the pile in a sheltered spot and adding more green material helps maintain some heat. In very cold climates, many people stop adding to the pile in winter and restart in spring.

What do I do with finished compost?

Mix it into garden beds, use it as mulch around plants, blend it into potting soil for containers, or spread it on your lawn. A typical household bin produces 1 to 2 cubic feet of finished compost every few months, enough for a small garden or several large pots.

Do I need to add special bacteria or enzymes to speed things up?

No. Bacteria and fungi are already present in soil, leaves, and food scraps. Commercial compost starters are not necessary and do not significantly speed decomposition if your pile is already balanced and moist. Save your money and focus on the right brown-to-green ratio and regular turning instead.

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. Untreated sawdust and wood chips are good brown material and add carbon, though they decompose slowly — shred or chip them smaller if possible.