Beginner Guide
How to Compost: 5 Steps That Work in Any Backyard
You do not need a bin, a tumbler, or any special equipment to start composting. A pile of layered material in the right spot will do it. Here is the process that works.
Pick a spot
Choose a spot that gets partial sun. Full shade slows decomposition. Full sun dries the pile out too fast. A 3x3x3 foot area is the minimum size for a hot pile that heats up properly. You can start smaller with a cold pile, but it will take longer.
Start with a brown layer
Lay down 4-6 inches of dry, high-carbon material. Dry leaves work best. Cardboard, straw, and wood chips also work. This layer creates drainage at the base and gives the pile structure. Do not skip this step. Starting with wet food scraps creates a soggy, smelly base.
Add food scraps in layers
Add 2-3 inches of food scraps or other nitrogen-rich material. Cover each food scrap layer with 4-6 inches of browns. The 3:1 browns-to-greens ratio by volume is the target. Every time you add kitchen scraps, cover them. Exposed food attracts pests.
Keep it moist and aerated
Water the pile if it gets dry. It should feel like a wrung-out sponge. Turn it every 3-7 days with a pitchfork or compost aerator. Each turn adds oxygen, which feeds aerobic microbes. A turned pile heats up to 130-160 degrees inside, which kills weed seeds.
Harvest when it is done
Compost is ready when it is dark, earthy-smelling, and you cannot identify individual inputs. Let it cure for 2-4 weeks before adding to garden beds. Use it at 10-25% by volume in potting mix, or spread 1-2 inches over garden soil and work it in.
What to add and what to avoid
Most kitchen scraps and yard waste work in a compost pile. A few things do not.
Good to add: Fruit and vegetable scraps, coffee grounds, tea bags, eggshells, dry leaves, shredded cardboard, paper bags, grass clippings, and plant trimmings.
Avoid outdoors: Meat, fish, dairy, cooked food, oily food, pet waste, treated wood, and diseased plant material. These attract pests or carry pathogens that survive a cold pile. Electric composters like Lomi handle meat and dairy on the counter without those problems.
Do you need a bin?
No. A pile works. But a bin has three practical benefits: it keeps the pile tidy, blocks some ground pests from entering from below, and retains heat and moisture better in hot or windy weather.
A tumbler composter adds one more benefit: turning the pile takes 10 seconds. For a busy kitchen composter who wants fast results without managing a pile by hand, a tumbler is worth the $80-130 investment.
How to compost in an apartment
An apartment kitchen has two composting options: a worm bin or an electric composter.
A worm bin fits under the kitchen counter. It has no smell when managed correctly. It produces the richest plant food of any composting method. It does not accept meat, dairy, or cooked food.
An electric composter like Lomi accepts all inputs, takes up countertop space, and produces dry material in 4-20 hours. It costs more upfront. It is the right choice for a household that throws away meat and dairy regularly.
How to use finished compost
Mix finished compost into garden beds at 1-3 inches per season, worked into the top 6 inches of soil. Use 10-20% compost by volume in potting mixes. Top-dress lawns at 0.5 inches, then water in. Apply around established trees and shrubs as a 1-2 inch mulch ring.
Common questions
Do I need a compost bin to start composting?
No. An open pile works fine. A bin keeps the pile neat, blocks some pests, and retains heat and moisture better than a bare pile. For small spaces or urban yards, a bin helps. For a large backyard with space to spare, a simple pile works.
Can I compost in an apartment?
Yes, with a few adjustments. Worm bins work well indoors with no smell when managed correctly. Electric composters like Lomi accept food scraps with no smell and produce dry output you can use on houseplants. Many cities also have compost drop-off programs if you just want the scraps gone.
How do I know when compost is ready to use?
Finished compost is dark brown to black, crumbly, and earthy-smelling. Individual materials are not identifiable. The pile has cooled to ambient temperature and does not reheat after turning. If you still see food scraps, leaves, or other recognizable material, give it more time.
What is the fastest way to compost?
Hot composting with frequent turning. Build a pile with the right carbon-to-nitrogen ratio (3:1 browns to greens by volume). Keep it moist. Turn every 2-3 days. A pile managed this way can finish in 3-6 weeks. The Berkeley rapid composting method is a formal version of this approach.
Can I add compost to potted plants?
Yes. Mix finished compost into potting soil at 10-20% by volume before planting. Top-dress existing containers with a 0.5-inch layer once or twice a year. Compost at 100% is too dense for containers and should always be mixed with other potting media.