Bokashi is a Japanese method of composting that ferments kitchen waste — including meat, fish, dairy and cooked food that a normal compost pile cannot handle — inside a sealed bucket, right in your kitchen. In small apartments and busy urban homes across Africa, bokashi offers a fast, clean and odour-controlled way to keep every scrap of food out of the bin and return it to the soil.
This guide explains the science behind bokashi, how to set up and run a bokashi system, what to do with the fermented material, and how to use the nutrient-rich liquid by-product on your plants.
What Is Bokashi?
Bokashi means "fermented organic matter" in Japanese. Instead of decomposing waste with oxygen (as in regular composting), bokashi pickles it anaerobically using beneficial microorganisms. The process is more like making sauerkraut than making compost — it preserves the waste, breaks down its structure, and prepares it for rapid breakdown in soil.
Bokashi vs. Traditional Composting
Feature
Bokashi
Traditional Composting
Accepts all food waste
Yes — meat, dairy, cooked food
No — plant matter only
Space needed
A bucket under the sink
Outdoor bin or pile
Time to finish
2 weeks ferment + 2–4 weeks in soil
2–6 months
Odour
Mild pickled smell
Earthy smell
Direct plant use
No — must be buried first
Yes, once mature
The Science in Simple Words
Bokashi bran is inoculated with effective microorganisms (EM) — a mix of lactic acid bacteria, yeasts and photosynthetic bacteria. In the sealed, airless bucket these microbes ferment the food, producing acids that suppress rotting organisms. The waste does not decay in the bucket; it pickles. That is why a bokashi bucket, properly sealed, does not attract flies or produce the rotten smells of ordinary garbage.
"Bokashi turns the one thing we all produce every day — food waste — into a gift for the soil, without needing a single square metre of garden."