Compost Guide

Composting is the #1 thing you can do to give back to Earth and reduce greenhouse gasses.

Don't have a yard or a green bin? No problem, you can compost indoors with no smell and no mess, here's how.

1 - Vermicomposting (Worm Composting)

How it works:
Red worms (like red wigglers) break down food waste in a bin,
creating nutrient-rich "worm castings."

What to include:

  • Soft veggie/fruit scraps

  • Coffee grounds, eggshells, paper

  • No citrus, meat, dairy, or oily food

Tips:

  • Keep bin moist and well-ventilated

  • Feed small amounts regularly

  • Best kept in shaded or temperature-controlled area (ideal: 55–77°F)

Timeframe: 2–3 months for finished worm compost

2 - Bokashi: a Japanese word meaning "fermented organic matter."
Bokashi uses an "inoculant" of either wheat germ, wheat bran, or sawdust
to create the micro-organisms that break down food waste.

How to do it: Layer kitchen scraps (vegetables and fruits, as well as meat and
dairy scraps) with a bokashi inoculant in a special bucket

The Special Bucket:

Build your own system or buy a complete bokashi composting kit. Companies that sell the kits usually sell replenishment products, including effective microorganisms and bokashi bran. Here are steps for DIY bokashi composting:

Local Organization Growing Neighbors can help you with creating a Bokashi bucket

  1. Chop food waste into 1- to 2-inch pieces. If you add larger pieces, they will take longer to ferment.

  2. About once a day or every two days, add a small sprinkle of bokashi bran, about 1 tablespoon per inch of food waste. Open the bin only to add scraps, not to check on the state of the fermentation. If you add fluffy scraps, press them down to remove the air or put a plate or another flat, heavy object on top of the material to weigh it down to limit oxygen exposure.

  3. Once the bin is full, keep it closed, and let it sit in a warm place for at least two weeks. During that time, drain the bokashi tea every few days. When the bokashi pre-compost is ready and fermented, you don't need to use it immediately. It can sit in the bokashi bucket for longer. During that time, the microbes will go dormant until you use it.

If you do have access to some green space you could try these styles of composting: 

3-Traditional (Cold) Composting

Overview:

This is the classic method of composting where organic materials are layered and left to decompose naturally over time, with minimal intervention. It doesn’t rely on high temperatures or worms — just a balance of materials, moisture, air, and time.

How It Works:

Composting is a biological process where microorganisms (bacteria and fungi) break down organic waste into a rich, soil-like material called humus or finished compost. These microbes need four key elements to thrive:

  • Carbon (browns): provides energy

    • Dry leaves

    • Straw/hay

    • Shredded cardboard or paper

    • Sawdust (untreated wood)

    • Corn stalks, wood chips

  • Nitrogen (greens): supports microbial growth

    • Vegetable scraps

    • Fruit peels

    • Grass clippings (fresh)

    • Coffee grounds and filters

  • Water: keeps everything moist for microbe activity

  • Air: helps aerobic microbes do their job efficiently

Target ratio:

Aim for about 1 part green to 2–3 parts brown to keep the pile balanced and odor-free.

4-Trench Composting

How it works:
Bury food scraps directly in garden soil by digging a trench or hole.

What to include:
Kitchen scraps (no meat/dairy), shredded paper, yard waste

Tips:

  • Dig 12" deep to deter pests

  • Ideal for fertilizing specific garden beds

  • No turning required

Timeframe: 1–6 months

Find out more about composting the Spokane County Regional Waste Ambassador Program