Compost turns kitchen scraps and yard waste into rich soil. Every banana peel, coffee filter and pile of autumn leaves you toss in the trash is a missed chance to feed your garden for free. Composting has a reputation for being smelly, complicated or only for people with big rural properties, but none of that has to be true. A small bin in a corner of the yard, a little attention each week and a basic understanding of what goes in will give you dark, crumbly, sweet-smelling compost within a few months. Here is everything a beginner needs to know to get started this season.
Why bother composting
Finished compost is one of the best things you can give your garden. It improves soil structure, helping sandy soil hold water and clay soil drain better. It feeds the earthworms and microbes that keep soil healthy. It slowly releases nutrients plants need, and it can reduce how much bagged fertilizer you buy.
There is a household benefit, too. Food scraps and yard waste make up a large share of what many families throw away. Composting keeps that material out of the trash bin, which can mean fewer bags at the curb and a kitchen garbage can that smells a lot fresher. Some cities even offer discounted bins or free workshops to encourage it; check your city or county website to see what is available near you.
Choose your setup
There is no single right way to compost. The best system is the one that fits your space and how much time you want to spend.
- Open pile. The simplest option: a heap in a shady corner, ideally at least 3 feet wide and 3 feet tall. Free, but less tidy.
- Enclosed bin. A plastic or wooden bin with a lid keeps things neat, holds in moisture and discourages animals.
- Tumbler. A barrel on a stand that you spin to mix. Easy to turn and good for small yards, though it holds less.
- Three-bin system. Side-by-side bays for fresh material, cooking compost and finished compost. Ideal for big gardens.
- Worm bin. Red wiggler worms in a tidy indoor or garage bin turn kitchen scraps into rich castings. Perfect for apartments.
Place outdoor bins on bare soil if you can, so worms and microbes can move in from below. A spot with partial shade keeps the pile from drying out too quickly in summer, and somewhere fairly close to the kitchen door makes it easier to keep the habit going.
Balance
Mix “greens” like food scraps with “browns” like dry leaves. This is the heart of composting. Greens are moist, nitrogen-rich materials that fuel the microbes. Browns are dry, carbon-rich materials that give the pile structure and keep it from turning slimy. A pile with too many greens smells sour; a pile with too many browns just sits there.
A good rule of thumb is roughly two to three parts browns to one part greens by volume. You do not need to measure precisely. If the pile smells, add browns. If it seems dry and nothing is happening, add greens and a little water.
Greens
Fruit and vegetable scraps, coffee grounds and paper filters, tea leaves, fresh grass clippings, garden trimmings and plant-based kitchen waste.
Browns
Dry leaves, straw, shredded plain cardboard, newspaper, paper egg cartons, small twigs, sawdust from untreated wood and dried plant stalks.
Leave these out
Meat, fish, bones, dairy, greasy foods and oils attract pests and can smell. Skip pet waste, diseased plants, weeds that have gone to seed and anything treated with chemicals. Glossy or coated paper and so-called compostable plastics often do not break down well in a backyard pile.
Compost is how your garden eats.
Rosa Bell, master gardener (fictional)
Keep it moist
Compost should feel like a wrung-out sponge. Microbes need water to do their work, but too much drowns them and pushes out the air they need. Squeeze a handful from the middle of the pile. If water drips out, it is too wet; mix in more browns. If it crumbles and feels dusty, sprinkle it with a hose as you turn it.
Don’t forget the air
Oxygen is the other ingredient people forget. Turning the pile with a garden fork every week or two mixes materials, brings fresh air to the center and speeds things up. If you do not have time to turn, that is fine; an untouched pile will still become compost, it will just take longer, often six months to a year instead of two or three months.
Chopping materials into smaller pieces also helps. A broccoli stalk cut into chunks breaks down much faster than a whole one, and running over leaves with a lawn mower turns them into perfect, fast-composting browns.
A simple weekly routine
Composting works best when it becomes part of your normal rhythm. Here is a routine many of our readers follow:
- Collect daily. Keep a lidded countertop container or a bowl in the freezer for kitchen scraps.
- Empty every few days. Add scraps to the pile and cover them with a layer of browns to discourage flies and odors.
- Check moisture weekly. Do the squeeze test and add water or browns as needed.
- Turn when you can. Every week or two, mix the pile with a garden fork.
- Stockpile browns. In fall, bag extra dry leaves so you have a supply all year.
Troubleshooting and using your compost
Most compost problems are easy to fix. A rotten-egg or ammonia smell usually means too many greens or too much water; add browns and turn. A pile that never heats up may be too small, too dry or short on greens. Fruit flies love exposed scraps, so always bury fresh additions under browns. If animals visit, switch to a bin with a secure lid and make sure no meat or dairy sneaked in.
When is it done?
Finished compost is dark brown, crumbly and smells like a forest floor. You should not be able to recognize most of the original materials, though a few stubborn twigs or eggshells are fine. Sift them out with a simple wire screen and toss them back into the active pile.
Spread 1 to 2 inches of finished compost over garden beds in spring or fall, mix it into the soil before planting vegetables, top-dress the lawn lightly or blend a little into potting mix for containers. Our first-veggie-bed stepper walks you through using it in a brand-new raised bed.
Key takeaway: Balance greens with browns, keep the pile as damp as a wrung-out sponge, add a little air and give it time. Nature does the rest.
Start small, start today
You do not need a fancy bin or a big yard to begin. Start with a bowl for kitchen scraps and a pile of leaves in a quiet corner. Within a season, you will have something remarkable: rich, living soil made from things you used to throw away. Your vegetables will grow stronger, your flower beds will look happier and your trash can will be lighter every week. Composting really is easier than you think, and once you see that first batch of dark, crumbly soil, you will never look at a banana peel the same way again.