Americans send 30-40% of their food to landfills. A compost pile turns that same waste into the best soil amendment money can’t buy.
The Story
I’ve written about saving eggshells for calcium, turning kitchen scraps into broth, and dehydrating tomato skins into powder. All of those are ways to squeeze more value out of food before it becomes waste. But eventually, there are scraps that can’t become broth or powder—banana peels, coffee grounds, apple cores, carrot tops, onion skins. What happens to those?
For most people, they go in the trash. Then into a plastic bag. Then into a landfill where they decompose without oxygen, generating methane—a greenhouse gas roughly 80 times more potent than CO2 in the short term. Food waste is one of the largest contributors to landfill methane emissions. And it doesn’t have to be.
I’ll be honest—I don’t have an active compost system running yet. I had a vermicompost bin for a while (that’s worm composting), and it worked well for kitchen scraps. But I haven’t set up an outdoor compost system on our property. This spring, that changes.
So this post isn’t “here’s my expert system.” It’s “here’s what I’ve learned, here’s what the research says, and here’s my plan.” I’m sharing the homework I’ve done so anyone starting from scratch can skip the research phase and just start.
Key Details
Difficulty: Beginner | Space Needed: 3’ x 3’ minimum | Cost: $0-150 (free pile to purchased bin) | Time: 5-10 minutes/week
Sustainability Note: Composting diverts food waste from landfills (reducing methane emissions), creates free soil amendment that replaces store-bought products, and closes the loop between kitchen and garden. Every banana peel and coffee ground that goes into compost instead of the trash is one less contribution to landfill gas and one step closer to feeding your soil for free.
What Composting Actually Is
Composting is controlled decomposition. You’re creating the conditions for microorganisms, fungi, and insects to break down organic material into humus—dark, crumbly, nutrient-rich material that improves soil structure, feeds plants, and retains moisture.
Nature does this on its own. Leaves fall, decompose on the forest floor, and become soil. Composting just speeds up the process by providing the right balance of materials, moisture, and air.
The result is often called “black gold” by gardeners, and for good reason. It improves clay soil by loosening it. It improves sandy soil by helping it hold moisture. It feeds plants slowly and naturally. And it’s free—made from things you were going to throw away.
The Two Ingredients: Greens and Browns
Everything that goes into a compost pile falls into one of two categories:
Greens (Nitrogen-Rich)
These are wet, fresh materials that provide nitrogen—the fuel that heats up the pile and feeds the microorganisms doing the decomposing.
- Fruit and vegetable scraps
- Coffee grounds and filters
- Tea bags (remove staples)
- Fresh grass clippings
- Fresh plant trimmings
- Eggshells (yes, they compost too—they just take longer than crushing them for the garden)
Browns (Carbon-Rich)
These are dry materials that provide carbon—the energy source for decomposition and the structural material that keeps the pile from becoming a slimy mess.
- Dried leaves
- Straw or hay
- Cardboard (torn into small pieces, no glossy coating)
- Newspaper (shredded)
- Wood chips or sawdust (untreated)
- Dry plant stalks and stems
- Pine needles
- Paper towels and napkins (unbleached)
The Ratio
The general guideline: 3 parts brown to 1 part green by volume. This isn’t exact science. You don’t need to measure. But the principle matters: you need more browns than greens.
Too many greens? The pile gets slimy, smells bad, and attracts flies. The fix: add more browns.
Too many browns? The pile sits there and does nothing. It decomposes, just slowly. The fix: add more greens or water.
When in doubt, add more browns. A pile that’s too dry and slow is easy to fix. A pile that’s a stinking, soggy mess is harder to deal with.
What NOT to Compost
This list matters. Putting the wrong things in your compost creates problems—odors, pests, disease, or contamination.
Never compost:
- Meat, fish, or bones (attracts rodents and other pests)
- Dairy products (attracts pests, creates odor)
- Fats, oils, or grease (smothers the pile, attracts pests)
- Pet waste (dog, cat) — can contain harmful parasites and pathogens
- Diseased plants (spreads disease to your garden when you use the compost)
- Weeds that have gone to seed (seeds can survive composting and sprout in your garden)
- Treated wood or sawdust (chemicals leach into compost)
- Glossy or coated paper (contains plastics)
- Coal or charcoal ash (contains chemicals harmful to plants)
Compost with caution:
- Citrus peels and onions: Fine in moderate amounts. Too much can make the pile acidic and slow decomposition.
- Bread and grains: Can attract pests. Bury them in the center of the pile if you include them.
Composting Methods
The Basic Pile
The simplest approach—literally a pile of organic material in a corner of your yard. No container needed. Just start stacking browns and greens in the right ratio, keep it damp (not wet), and turn it occasionally with a garden fork.
Pros: Free, no equipment, easy to scale up. Cons: Can look messy, more accessible to pests, takes longer without containment. May not be ideal if you’re in town with neighbors close by.
Bin Composting
A compost bin contains the pile and keeps it neater. Options range from DIY (chicken wire cylinder, wooden pallet bin) to purchased bins ($30-150). For a half-acre lot in town, this is usually the best option—contained, tidy, and neighbor-friendly.
Pros: Tidier, retains heat better (faster decomposition), keeps pests out. Cons: Costs money (unless DIY), limits volume.
Tumbler Composting
A sealed drum on a frame that you rotate to mix the contents. Good for small spaces and people who want faster results.
Pros: Fast decomposition, easy turning, pest-proof, neat appearance. Cons: More expensive ($80-200+), limited capacity, can get too wet if not monitored.
Vermicomposting (Worm Composting)
This is the one I have experience with. You keep a bin of red wiggler worms and feed them kitchen scraps. The worms eat the scraps and produce castings (worm poop)—one of the richest soil amendments you can get.
Pros: Works indoors year-round, produces incredibly nutrient-dense castings, handles kitchen scraps efficiently, small footprint. Cons: Requires maintaining a worm population, can smell if overfed, limited to food scraps (not yard waste), not ideal for large volumes.
I ran a vermicompost bin for a while and it worked well for kitchen scraps. The castings were excellent. But it doesn’t handle yard waste—garden trimmings, leaves, stalks—and that’s what I need a full outdoor compost system for.
My Plan for This Spring
Based on everything I’ve researched, here’s what I’m planning:
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Start with a bin in a convenient spot near the garden. On our half-acre lot, space isn’t unlimited, so a contained bin keeps things tidy and out of the way. Convenience matters—if it’s a long walk from the kitchen, I won’t use it consistently.
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Stockpile browns. This is the part most beginners forget. You’ll generate greens (kitchen scraps) daily, but browns come seasonally—mostly fall leaves. I’m going to bag and save dried leaves this fall so I always have browns available.
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Keep a kitchen scrap container. A small covered container on the counter or under the sink for collecting scraps before taking them to the compost. Empty it every few days.
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Layer, don’t dump. Alternate layers of greens and browns rather than dumping a week’s worth of kitchen scraps on top. This keeps the ratio balanced and prevents the slimy, smelly pile problem.
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Turn it monthly. Turning introduces oxygen, which speeds decomposition. Once a month with a garden fork should be enough for a passive compost pile.
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Be patient. A well-managed compost pile produces usable compost in 3-6 months. A passive pile takes 6-12 months. Either way, it works—it just takes time.
Quick Reference
The Ratio: 3 parts brown (dry) to 1 part green (wet)
Greens (Nitrogen):
- Fruit/vegetable scraps, coffee grounds, tea bags
- Fresh grass clippings, fresh plant trimmings
Browns (Carbon):
- Dried leaves, straw, shredded cardboard/newspaper
- Wood chips, dry stalks, pine needles
Never Compost:
- Meat, dairy, fats, oils
- Pet waste
- Diseased plants
- Weeds gone to seed
- Treated wood
Troubleshooting:
| Problem | Cause | Fix |
|---|---|---|
| Smells bad | Too many greens, not enough air | Add browns, turn the pile |
| Not decomposing | Too dry or too many browns | Add greens or water, turn the pile |
| Attracting pests | Exposed food scraps | Bury scraps in the center, don’t add meat/dairy |
| Slimy texture | Too wet, poor drainage | Add browns, improve drainage, turn more often |
Links & References
- More Wednesday Wisdom: Eggshells Aren’t Trash — eggshells work in compost too, but crushing them for the garden is a faster path to calcium
- More Wednesday Wisdom: Kitchen Scraps to Broth — use scraps for broth first, then compost what’s left
- More Wednesday Wisdom: Cardboard Weed Barrier — another way cardboard serves the garden instead of the landfill
- More Wednesday Wisdom: Tomato Powder — dehydrate tomato skins before composting the rest
Sources
Equipment used in this post: As an Amazon Associate, I earn from qualifying purchases.
- GEOBIN Compost Bin — affordable, expandable, easy to set up
- FCMP Outdoor Compost Tumbler — faster composting, keeps pests out
- Fiskars Ergo D-Handle Steel Garden Fork — for turning and aerating your pile
Composting isn’t complicated. It’s the oldest recycling program on the planet—nature’s been running it for millions of years. We’re just catching up.