The Brown-Green Balance

Every compost pile needs two types of material:

Browns (carbon-rich): Dried leaves, cardboard, newspaper, straw, sawdust, wood chips, dried plant stalks. Browns provide energy for microbes and create airflow structure.

Greens (nitrogen-rich): Kitchen scraps (fruit and vegetable peels, coffee grounds, eggshells), fresh grass clippings, green plant trimmings, and spent garden plants. Greens provide the protein microbes need to multiply.

The ideal ratio is roughly 3 parts brown to 1 part green by volume. You don't need to measure precisely — if the pile smells bad, add more browns. If it's not decomposing, add more greens.

What to Compost (and What to Skip)

Compost These

• Fruit and vegetable scraps, peels, and cores
• Coffee grounds and paper filters
• Tea bags (remove staples)
• Eggshells (crush for faster breakdown)
• Dry leaves, straw, and hay
• Shredded cardboard and newspaper (non-glossy)
• Grass clippings (in thin layers — they mat when piled thick)
• Garden trimmings and spent plants (disease-free)
• Sawdust from untreated wood

Skip These

• Meat, fish, and bones (attract pests, create odor)
• Dairy products (same issues as meat)
• Oils and greasy food (slow to decompose, attract pests)
• Pet waste from dogs or cats (harbors pathogens)
• Diseased plants (pathogens survive unless pile reaches 135°F+)
• Weeds that have gone to seed (seeds may survive composting)
• Treated or painted wood (chemicals leach into compost)

How to Build and Manage a Pile

Layer materials — start with a 4-inch base of coarse browns (sticks, straw) for airflow, then alternate greens and browns. Water each layer until damp but not soggy.

Turn the pile every 1–2 weeks with a garden fork. Turning introduces oxygen, which speeds decomposition and prevents anaerobic conditions (the source of bad smells). A tumbler composter eliminates this step — just spin the drum.

Monitor moisture. The pile should feel like a wrung-out sponge. Too dry and decomposition stalls. Too wet and the pile goes anaerobic and smelly. Add browns if it's too wet; water it if it's too dry.

It's done when: The material is dark, crumbly, earthy-smelling, and you can't identify the original ingredients. This takes 2–4 months in an actively managed pile, 6–12 months in a passive pile.

Troubleshooting Common Problems

• Pile smells bad: Too many greens or too wet. Add browns (dried leaves, shredded cardboard) and turn to introduce air.
• Pile isn't heating up: Too many browns, too dry, or too small. Add greens, water, and make sure the pile is at least 3 feet in each dimension to retain heat.
• Fruit flies: Bury kitchen scraps under a layer of browns rather than leaving them on the surface.
• Attracting rodents: Avoid composting meat, dairy, or cooked food. Use a sealed tumbler or bin with a secure lid if rodents are a concern in your area.

Using Finished Compost

Knowing how to make compost is half the equation. Knowing how to use it effectively completes the cycle.

Garden Bed Amendment

The primary use for finished compost is as a soil amendment. Spread 1–2 inches across garden beds and work it into the top 6–8 inches of soil before planting. For established beds, apply as a top-dressing around plants without disturbing roots — earthworms and rain will incorporate it naturally over a few weeks. Annual application is sufficient for most gardens; new or depleted soils benefit from heavier initial doses of 3–4 inches.

Potting Mix Ingredient

Mix finished compost into potting soil for containers at a ratio of about 25–30% compost to 70–75% potting mix. Pure compost in containers holds too much moisture and compacts over time, restricting root growth. The blend provides nutrients that extend the feeding window beyond what potting mix alone offers — you'll need to fertilize less frequently with compost in the mix.

Compost Tea

Compost tea is a liquid extract made by steeping finished compost in water for 24–48 hours (ideally with aeration from an aquarium bubbler). The resulting liquid delivers nutrients and beneficial microorganisms directly to the root zone when used as a soil drench, or to leaf surfaces when applied as a foliar spray. It's particularly useful for container plants and seedlings that benefit from gentle, frequent feeding.

Mulch Layer

A thin layer of compost (half an inch to one inch) applied as a surface mulch around plants serves double duty — it feeds the soil as it integrates and suppresses weed seed germination. This is especially effective around perennials, shrubs, and fruit trees where you don't want to disturb the root zone with digging.

Seed Starting Mix Ingredient

Finely sifted, fully finished compost (screened through quarter-inch mesh) can be mixed with perlite and peat or coconut coir to create a nutrient-rich seed starting mix. The ratio is roughly one-third compost, one-third perlite, and one-third peat. This mix provides gentle nutrition that synthetic seed-starting mixes lack, giving seedlings a head start without the risk of burning tender roots.

Lawn Top-Dressing

Spreading a thin layer (quarter inch) of finely screened compost over your lawn — called top-dressing — improves soil biology, feeds grass naturally, and helps break down thatch. Apply in spring or fall, rake to distribute evenly, and water in. Two applications per year can reduce or eliminate the need for synthetic lawn fertilizer.