Composting for Beginners: A Simple Backyard Setup
Riley Hofmann
Composting is just stacking carbon-rich dry material and nitrogen-rich wet material in a pile big enough to heat up, then leaving it alone long enough to break down. That's the whole thing. The rest is optimization.
The reason to bother: finished compost is the 30% of your raised bed soil mix that you'd otherwise buy by the bag, every season, forever. I bought bagged compost my first season before I started a pile — haven't bought a bag since.
Browns and greens
Every compost guide talks about browns and greens, and it just means carbon-rich versus nitrogen-rich:
- Browns (carbon) — dry leaves, straw, cardboard, paper, wood chips, dead plant stems
- Greens (nitrogen) — vegetable scraps, coffee grounds, fresh grass clippings, garden trimmings
Aim for noticeably more browns than greens by volume. A pile that's too green goes slimy and smells like ammonia. A pile that's all browns just sits there doing nothing for a year.
Pile size and location
Size matters more than people expect. A pile needs to be at least 3 feet by 3 feet by 3 feet to hold enough heat to break down efficiently, and no bigger than about 5 feet per side or the center won't get air.
- Put it somewhere well-drained and easy to reach year-round — convenience beats optimal sun exposure
- Sun or shade both work as long as you're managing moisture
- Start with a base layer of coarse browns like twigs to keep air moving underneath
A bin isn't required — an open pile works. NC State Extension covers the common bin styles if you'd rather contain it.
What to keep out
- Meat, fish, dairy, and grease — they attract rodents and smell terrible
- Pet waste from dogs and cats — pathogen risk in a food garden
- Diseased plant material — a home pile often doesn't get hot enough to kill pathogens reliably
- Weeds that have gone to seed, unless your pile genuinely runs hot
Keeping it going
Two things to manage: moisture and air. The pile should feel like a wrung-out sponge — damp, not dripping. If it's dry, it stalls; if it's soaked, it goes anaerobic and starts to stink.
Turning the pile every few weeks speeds things up a lot by getting air into the middle. You can skip turning entirely, but then you're waiting closer to a year instead of a few months. UConn Extension has a practical walkthrough of both approaches.
How to tell when it's finished
Finished compost is dark, crumbly, and smells like forest floor — earthy, not sour or sharp. You shouldn't be able to identify what any of it originally was. If you can still pick out recognizable vegetable scraps, give it more time.
Frequently asked questions
- How big does a compost pile need to be?
- At least 3 feet on each side — roughly 3x3x3 — to hold enough heat to break down efficiently, and no larger than about 5 feet per side so air can still reach the center.
- What is the right ratio of browns to greens?
- Noticeably more browns (dry, carbon-rich material) than greens (wet, nitrogen-rich material) by volume. Too many greens turns the pile slimy and makes it smell like ammonia.
- Why does my compost pile smell bad?
- Almost always too many greens, too much moisture, or not enough air. Add dry browns, turn the pile to get oxygen into the middle, and the smell usually clears within days.
- Can I compost meat and dairy?
- Not in a backyard pile. They attract rodents and create strong odors. Stick to plant material, coffee grounds, and yard waste.
- How long does compost take?
- A few months if you turn it regularly and keep the browns-to-greens balance and moisture right. Closer to a year if you build the pile and never touch it again.