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