How To Make Bokashi – Transform Food Scraps Into Nutrient-Dense Soil
Bokashi is an anaerobic fermentation process that uses specialized microbes to break down all types of kitchen waste, including meat and dairy, into a powerful soil conditioner. Unlike traditional composting, it happens in a sealed environment and takes only two to four weeks to complete.
To succeed, you need an airtight bin, a way to drain liquid, and “EM” (Effective Microorganism) inoculated bran. Once fermented, the “pre-compost” is buried in the garden to finish breaking down and feed your plants.
You probably know the frustration of a slow-moving compost pile that attracts pests or smells like rotting vegetables. If you want a faster, cleaner way to recycle every scrap of food from your kitchen, learning how to make bokashi is the ultimate solution.
This method allows you to process materials that usually go to the landfill, such as cheese, bones, and citrus peels. You will reduce your household waste significantly while creating a goldmine of nutrients for your flowers and vegetables.
In this guide, I will walk you through the science of fermentation, the essential tools you need, and the step-by-step process to ensure your garden thrives. Let’s turn your kitchen waste into a professional-grade soil amendment.
Understanding the Science of Anaerobic Fermentation
Bokashi is a Japanese term meaning fermented organic matter. Unlike a traditional backyard compost pile that requires oxygen (aerobic), this system thrives in an environment without any air (anaerobic).
The secret lies in the inoculated bran, which contains a mix of beneficial microbes. These usually include Lactobacillus bacteria, yeasts, and photosynthetic bacteria that “pickle” the food waste rather than letting it rot.
Because the food is fermented, it retains more nitrogen and carbon than traditional compost. This prevents the release of greenhouse gases like methane and carbon dioxide, making it an eco-friendly choice for the modern gardener.
This process also produces a byproduct known as “bokashi tea.” This liquid is teeming with microbes and serves as a potent liquid fertilizer when diluted properly for your perennials or lawn.
Essential Materials for Your Setup
Before you begin, you need to gather specific supplies. You do not need expensive commercial kits, though they offer convenience for those who prefer a ready-made solution.
First, you need an airtight container. Most gardeners use a five-gallon bucket with a tight-fitting lid. If air leaks into the system, the fermentation will fail and lead to putrid odors.
Second, you need a way to drain the liquid. You can install a spigot at the bottom of your bucket or use a “double-bucket” system where the top bucket has holes drilled in the bottom to let liquid drip into a second bucket below.
Third, you must have bokashi bran. This is typically wheat or rice bran that has been treated with Effective Microorganisms (EM-1) and molasses. This bran acts as the fuel for the fermentation process.
Finally, gather a “masher” or an old plate. You will use this to press down the food scraps to remove air pockets. Removing oxygen is the most critical step in ensuring the microbes can do their work effectively.
Step-by-Step: How to Make Bokashi
Start by preparing your bucket. If you use the double-bucket method, ensure the inner bucket sits snugly inside the outer one. Sprinkle a generous handful of inoculated bran at the very bottom.
Add your kitchen scraps throughout the day. You can include fruit, vegetables, cooked leftovers, meat, and small bones. Cut larger pieces into one-inch chunks to increase the surface area for the microbes to colonize.
Once you add a layer of food (about two inches deep), sprinkle another layer of bran on top. Use about one tablespoon of bran for every cup of food. If you add high-protein items like meat, use a bit more bran to keep the process stable.
Press the food down firmly using your masher or plate. You want to squeeze out as much air as possible. Seal the lid tightly after every addition to maintain the anaerobic environment required for success.
Continue this layering process until the bucket is full. Once full, seal it one last time and let it sit undisturbed for at least 14 days. Store the bucket in a room-temperature area, away from direct sunlight.
Every two to three days during this period, drain the liquid from the bottom. This liquid, or “tea,” must be removed to prevent the ferment from becoming too soggy and turning foul.
Managing the Fermentation Process
When you understand how to make bokashi, you unlock a new level of garden health, but you must monitor the “smell test.” A healthy bin should smell like pickles, vinegar, or cider.
If the bin starts to smell like rotten eggs or sewage, something has gone wrong. Usually, this means air has entered the bin or you haven’t added enough microbial bran to compete with bad bacteria.
You might see a white, fuzzy mold growing on the surface of your scraps. Do not panic! This is a sign of healthy actinomycetes or yeast growth, which indicates the fermentation is progressing perfectly.
However, if you see green, black, or blue mold, this is a sign of spoilage. In this case, you should bury the contents deep in a remote part of the garden and start over with a cleaner bucket and more bran.
Remember to wash your hands or wear gloves when handling the fermented material. While the microbes are generally safe, the acidic environment and concentrated organic matter can irritate sensitive skin.
How to Use the Finished Product in Your Garden
After two weeks of sitting, the food in your bucket will look mostly the same. However, its cellular structure has changed significantly. It is now “pre-compost” and ready to hit the soil.
The most common method is the trench method. Dig a hole or trench in your garden bed about 12 inches deep. Pour the fermented contents into the hole and spread them out evenly.
Mix the pre-compost with some of the existing soil and then cover it with at least six inches of fresh soil. This prevents animals from digging it up and allows the soil’s native earthworms to finish the job.
Wait at least two weeks before planting directly over this spot. The material is very acidic initially (pH 3.5 to 4.5). This acidity will neutralize as the material breaks down into humus over the next 14 to 21 days.
If you live in an apartment or don’t have garden space, you can create a “soil factory.” Simply mix the fermented scraps with old potting soil in a large plastic tub. In a few weeks, the soil will be revitalized and ready for your indoor containers.
Maximizing the Benefits of Bokashi Tea
The liquid you drain from your bucket is a biological powerhouse. It contains organic acids, enzymes, and a high concentration of beneficial microbes that improve soil structure.
Never apply the tea directly to your plants at full strength. It is highly acidic and can burn delicate roots. Dilute it at a ratio of 1:100 (about two tablespoons per gallon of water) for general garden use.
Use this mixture to water your lawn or flower beds once a week. It helps break down thatch in turfgrass and unlocks micronutrients that might be trapped in the soil.
You can also pour undiluted tea down your kitchen or bathroom drains. The microbes help clean the pipes and compete with odor-causing bacteria in your septic or sewer system.
Bokashi vs. Traditional Composting: Which Is Better?
Many beginners ask how to make bokashi without spending a fortune on pre-made kits, and the answer lies in understanding that this is a complementary system, not necessarily a replacement for a compost pile.
Traditional composting is excellent for large amounts of yard waste, like mulched leaves or grass clippings. However, it is slow and requires frequent turning to maintain aeration and heat.
Bokashi excels at handling kitchen waste in a small footprint. It is ideal for urban dwellers or those who want to process meat and dairy without attracting rodents or flies to their property.
For the best results, many professional landscapers use a hybrid approach. They ferment their kitchen waste and then add the fermented material to their traditional compost pile to act as a “starter” or accelerator.
This hybrid method speeds up the breakdown of “browns” (carbon-rich materials) in the compost pile. It creates a diverse microbial profile that results in a more complex NPK balance for your plants.
Frequently Asked Questions
Is It Difficult to Learn How to Make Bokashi?
No, the process is very straightforward as long as you maintain an airtight seal. Once you have the right bucket and bran, it only takes a few minutes of work each day to manage your kitchen waste.
Can I Put Citrus Peels and Onions in a Bokashi Bin?
Yes! Unlike worm composting (vermicomposting), where citrus and onions can harm the worms, the fermentation process handles these acidic and pungent foods with ease.
What Should I Do If My Bin Smells Bad?
If the smell is putrid, add more bran and ensure the lid is sealed perfectly. If the smell persists, the batch may be lost. Bury it deep in the ground and thoroughly sanitize your bucket before starting again.
How Long Does the Bran Last?
Stored in a cool, dry, and dark place, inoculated bran can remain effective for up to a year. Always keep the bag sealed to prevent moisture from activating the microbes prematurely.
Can I Make My Own Bokashi Bran?
Yes, you can make your own by mixing wheat bran, water, molasses, and EM-1 liquid. It requires a drying process to make it shelf-stable, but it is a cost-effective option for large-scale gardening.
Conclusion
Mastering the art of fermentation is one of the most rewarding skills a DIY gardener can acquire. By taking the time to understand the process, you turn a waste stream into a valuable resource that builds soil health and plant resilience.
Whether you are looking to boost the yield of your vegetable garden or simply want to reduce your environmental footprint, this method provides a practical and efficient path forward. Start your first bucket today and watch your garden transform.
Remember to keep your equipment clean, drain your tea regularly, and always prioritize an airtight seal. Your plants will thank you with vibrant blooms and a bountiful harvest. Happy gardening!
Taylor pairs an engineer's eye with years of hands-on work in soil, lawns and outdoor machinery. He tests ideas in his own garden, keeps tractors and mowers running himself, and speaks to local horticulture groups. Every Garden Aider guide is written to be practical, accurate and safe to follow.
“To bring life alive, you just need to mix some love with the compost, bedding, and gardening machines.”