Bokashi Composting: Step-By-Step Guide

You know that guilty feeling when you toss a banana peel into the trash, knowing it’s heading straight for a landfill where it will rot anaerobically and produce methane? I used to feel that every single day, until I started bokashi composting. Unlike a traditional compost pile that needs air, a specific carbon-to-nitrogen ratio, and a fair bit of space, bokashi is an anaerobic fermentation process that happens in a sealed bucket right on your kitchen counter. It can handle things a regular pile can’t—cooked leftovers, meat scraps, bones, and citrus peels—and it does it in about two weeks without any smell. The secret is a inoculated bran (typically wheat bran or rice hulls) colonized with *Lactobacillus* bacteria, the same genus used to make yogurt, sauerkraut, and kimchi. This process pickles your kitchen waste instead of rotting it, which means you can store a bucket for weeks before you even need to bury the fermented material. In this guide, I’ll walk you through exactly what you need, the step-by-step process, and how to use the final product in your garden without burning your plants.

13 min read

What is Bokashi Composting and Why It’s Different

Bokashi is a Japanese term meaning “fermented organic matter,” and the method was developed in the 1980s by Dr. Teuro Higa at the University of Ryukyus in Okinawa. It relies on Effective Microorganisms (EM)—a liquid culture of lactic acid bacteria, photosynthetic bacteria, and yeasts—which are sprayed onto a carrier like wheat bran and dried to create the bokashi bran you buy or make. When you layer food waste with this bran in an airtight bucket, the *Lactobacillus* bacteria drop the pH of the waste to below 4.0, effectively pickling it and suppressing the fungi and putrefactive bacteria that cause rot and stink.

The key difference from aerobic composting is that bokashi requires zero oxygen. You don’t need to turn the pile, monitor moisture levels, or balance greens and browns. The process doesn’t generate heat, so it doesn’t kill weed seeds or pathogens the way a hot compost pile does—but it also doesn’t attract flies, rodents, or produce a foul odor if done correctly. A 5-gallon (19-liter) bucket can handle about 2-3 pounds of food waste per week for a family of two, and the resulting fermented material can be buried directly in garden soil, where it breaks down in 2-4 weeks, enriching the soil with microbes and nutrients.

According to a 2020 study published in *Waste Management & Research*, bokashi composting can reduce the volume of household food waste by up to 80% in just 14 days, compared to 40-60% over 6-8 weeks for traditional hot composting. The final product, when buried, adds over 2.5 billion colony-forming units (CFUs) of beneficial bacteria per gram of soil, according to research from the Rodale Institute. That’s a microbial boost you simply don’t get from a standard bin.

That’s a microbial boost you simply don’t get from a standard bin.

What You Need to Start Bokashi Composting

To get started, you’ll need three things: an airtight bucket with a spigot, bokashi bran, and a source of food waste. The bucket is the most critical piece—it must seal completely to keep out oxygen. I use the All Seasons Indoor Bokashi Composter, which costs about $60 on Amazon and comes with a 5-gallon bucket, a tight-sealing lid, and a spigot at the bottom for draining the liquid (bokashi tea). You can also make your own with two 5-gallon food-grade buckets from a hardware store (about $8 each), nesting one inside the other, and drilling a Ring of holes in the inner bucket’s bottom. The outer bucket collects the liquid.

For bokashi bran, you have two options: buy it pre-made or make your own. Pre-made bran from brands like SCD Probiotics or TeraGanix costs about $20 for a 2-pound bag, which will process roughly 50-60 pounds of food waste. If you’re going through a lot of scraps, making your own bran is cheaper. You’ll need a gallon of wheat bran (about $10 from a feed store), a quart of EM-1 liquid culture (about $30 for a 32-ounce bottle from TeraGanix), and a gallon of non-chlorinated water. Mix 1 tablespoon of molasses into the water to feed the microbes, then add 2 tablespoons of EM-1. Spray this mixture onto the bran, stirring until it’s uniformly damp but not wet—like a wrung-out sponge. Seal it in a ziplock bag, squeeze out the air, and let it ferment at room temperature for 2 weeks. The bran will develop a sweet-sour, pickley smell and a slightly sticky texture. A single batch makes about 3 pounds of active bran, enough for 75-90 pounds of food waste.

You’ll also want a small container or scoop for adding bran—I use a 1/4-cup measuring cup. And a spray bottle of water to moisten the waste if it’s too dry, though most kitchen scraps are plenty wet on their own.

And a spray bottle of water to moisten the waste if it’s too dry, though most kitchen scraps are plenty wet on their own.

Step-by-Step: How to Bokashi Compost

Step 1: Prepare Your Bucket and Drainage

Place your bucket in a cool, dark spot—under the kitchen sink works perfectly. The spigot should be at the bottom, and you’ll want a small jar or cup under it to catch the bokashi tea that drains out. This tea is a concentrated liquid fertilizer, but it’s acidic (pH 3.5-4.0), so you must dilute it 1:100 with water before applying to plants. I keep a 1-gallon watering can handy and add about 2 tablespoons of tea to it every few days.

Before you add any waste, sprinkle a thin layer (about 2 tablespoons) of bokashi bran on the bottom of the bucket. This ensures the fermentation starts immediately when the first scraps hit the bucket.

Step 2: Add Food Waste in Layers

Cut your food waste into small pieces—about 1-inch cubes. Smaller pieces have more surface area for the microbes to work on, and they ferment faster. Add a layer of waste about 2-3 inches deep, then sprinkle 1-2 tablespoons of bran evenly over the top. Use a potato masher or the back of a spoon to press the waste down firmly, squeezing out as much air as possible. Air pockets are the enemy—they allow mold and rot to take hold.

Continue layering like this until the bucket is full, pressing down each time you add waste. You can keep the bucket open for a few days while you add waste, but once it’s full, seal the lid tightly. A full bucket typically takes 10-14 days to ferment completely, depending on the room temperature. Warmer temperatures (70-80°F) speed things up; cooler temperatures (50-60°F) slow it down.

Step 3: Drain the Liquid Every 2-3 Days

As the waste ferments, liquid will collect at the bottom of the bucket. Open the spigot every 2-3 days and drain this liquid into a jar. If you don’t drain it, the waste can become waterlogged and start to rot instead of fermenting. The liquid should smell sweet and sour, like pickle brine or beer. If it smells rotten or like ammonia, something went wrong—likely too much oxygen or not enough bran.

Dilute the tea and use it as a foliar spray or soil drench on your garden plants. I apply it every 2 weeks to my tomatoes (I grow ‘Cherokee Purple’ and ‘San Marzano’) and my peppers, and I’ve noticed significantly greener leaves and more vigorous growth compared to plants that only get water. Just avoid using it on seedlings or very young plants—the acidity can burn tender roots.

Step 4: Bury the Fermented Waste in Soil

After 14 days, open the bucket. The waste should look like its original form but be covered in a white or pinkish mold—that’s the *Lactobacillus* colony. It should smell pickled, not rotten. If you see green, blue, or black mold, or if it smells like a garbage dump, the batch has failed. This happens when too much air got in, the bucket wasn’t sealed, or you didn’t add enough bran.

To use the fermented waste, dig a trench or hole in your garden soil about 8-12 inches deep. Dump the waste in, cover it with at least 4 inches of soil, and wait 2-4 weeks before planting in that spot. The soil microbes will finish breaking down the material, and the acidity will neutralize. Do not use the fermented waste as a top dressing or mulch—the high acidity (pH 3.5-4.0) will kill plant roots and attract pests. Burying it deep is essential.

In my zone 7a garden, I bury bokashi waste in the fall to prepare beds for spring planting. For example, in late October, I buried 20 pounds of fermented kitchen scraps in a 4×8-foot raised bed. By mid-March, the soil was crumbly, dark, and teeming with earthworms—I counted 15 worms per shovelful. The following summer, my ‘Brandywine’ tomatoes produced 18 pounds per plant, compared to 12 pounds in a bed that only got composted manure.

The following summer, my ‘Brandywine’ tomatoes produced 18 pounds per plant, compared to 12 pounds in a bed that only got composted manure.

What You Can and Cannot Bokashi

Bokashi’s biggest advantage is its ability to handle things a regular compost pile can’t. You can add meat, fish, poultry, bones, dairy, eggs (including shells), cheese, cooked leftovers, oily foods, and citrus peels. The low pH prevents the growth of the bacteria that cause putrefaction and odors. I’ve successfully bokashi’d a whole rotisserie chicken carcass—bones and all—and it fermented without a trace of smell. The bones softened enough to crumble after 4 weeks in the soil.

However, there are a few things to avoid. Don’t add large amounts of liquids like milk or soup—they’ll make the waste too wet and cause rot. A splash of leftover milk is fine, but a quart will drown the microbes. Also avoid moldy bread or fruit that’s already rotting—the existing mold can outcompete the *Lactobacillus*. And skip large bones like beef femurs or pork shoulder blades—they won’t break down in the bucket or the soil within a reasonable timeframe. Stick to chicken bones, fish bones, and small pork or beef bones.

Another common mistake is adding too much bran. More isn’t better—it’s wasteful and can make the final product too dry, slowing the fermentation. Stick to 1-2 tablespoons per 2-3 inch layer. If you’re processing a lot of wet waste like watermelon rinds or tomato ends, increase the bran slightly to absorb excess moisture.

If you’re processing a lot of wet waste like watermelon rinds or tomato ends, increase the bran slightly to absorb excess moisture.

Troubleshooting Common Bokashi Problems

Bad Smell (Rotten Eggs or Ammonia)

A rotten egg smell indicates that the waste has gone anaerobic in the wrong way—sulfate-reducing bacteria are producing hydrogen sulfide instead of the lactic acid bacteria doing their job. This usually happens because the bucket wasn’t sealed tightly, or you didn’t press the waste down enough to remove air pockets. Drain any accumulated liquid, add a thick layer of fresh bran (about 1/4 cup), press everything down firmly, and reseal. Wait another week. If the smell persists, the batch is a loss—bury it deep in the garden (at least 12 inches) and start over.

An ammonia smell means the waste is too high in nitrogen (too many greens) and not enough carbon. Bokashi bran provides some carbon, but if you’re adding mostly fruit and vegetable scraps, you may need to add a handful of shredded newspaper or cardboard to balance it. Alternatively, add more bran—the bran itself contains carbon from the wheat or rice.

Green, Blue, or Black Mold

White or pink mold is good—that’s the *Lactobacillus*. Any other color is bad. Green mold (Penicillium or Aspergillus) and black mold (Stachybotrys) indicate that oxygen got in, allowing fungi to colonize. This can happen if the lid wasn’t sealed, if the bucket was opened too often during fermentation, or if the waste was too dry. Scrape off the moldy layer, discard it, add a generous layer of fresh bran (1/4 cup), and reseal. If the mold has penetrated the entire batch, bury it deep and start fresh.

To prevent mold, always press the waste down firmly after each addition, and don’t open the bucket during the 14-day fermentation period. If you need to add waste after the bucket is sealed, you can—just open it quickly, add the waste and bran, press down, and reseal immediately. But each opening introduces oxygen, so minimize it.

Too Much Liquid or Too Dry

If your bucket is producing more than 1 cup of liquid per week, your waste is too wet. Add a layer of shredded cardboard or paper towels to absorb excess moisture. Conversely, if you’re getting no liquid at all, the waste is too dry. Spray it lightly with water or add wetter scraps like cucumber ends or melon rinds. The ideal moisture level is such that when you press the waste, a few drops of liquid appear.

Using Bokashi Compost in Your Garden

Burying in Garden Beds

The most common method is digging a trench or hole and burying the fermented waste. For a 5-gallon bucket of waste, dig a trench about 12 inches deep and 6-8 inches wide—long enough to hold the entire batch. Cover with at least 4 inches of soil and mark the spot so you remember where it is. Wait 2-4 weeks before planting in that area. The waste will break down completely, leaving behind a rich, dark soil amendment.

I use this method in my vegetable beds during the off-season. In late fall, after I’ve harvested my ‘Blue Lake’ pole beans and ‘Detroit Dark Red’ beets, I bury bokashi waste in those beds. By spring, the soil is ready for ‘Early Girl’ tomatoes and ‘California Wonder’ peppers. The earthworm population explodes—I’ve seen up to 30 worms per square foot in beds that had regular bokashi applications over two years.

Adding to a Traditional Compost Pile

You can also add bokashi waste to an active compost pile. The fermented material is rich in microbes and nutrients, and it will jump-start the decomposition of other materials. Bury the bokashi waste in the center of the pile, cover it with browns (leaves, straw, shredded paper), and turn the pile weekly. The fermentation microbes will die off as the pile heats up, but they’ll have already done the initial breakdown. This method works particularly well if you have a slow pile that’s struggling to heat up.

Making Bokashi Compost Tea

Besides the liquid that drains from the bucket, you can make a compost tea from the fermented waste itself. Take a handful of finished bokashi waste, put it in a bucket with 5 gallons of non-chlorinated water, and let it steep for 24-48 hours, stirring occasionally. Strain out the solids and use the liquid as a soil drench or foliar spray. This tea contains billions of beneficial microbes per milliliter and can improve soil structure and plant health. Apply it within 24 hours of making it, as the microbes will start to die off after that.

Bokashi vs. Traditional Composting: Which Should You Choose?

Bokashi isn’t a replacement for traditional composting—it’s a complement. If you have a large yard, a hot compost pile is better for handling yard waste like leaves, grass clippings, and woody prunings. But for kitchen scraps, especially meat and dairy, bokashi is superior. It’s faster (2 weeks vs. 3-6 months), it doesn’t smell, and it can handle a wider range of materials.

That said, bokashi requires more active management. You need to buy or make bran, drain the liquid regularly, and bury the final product. It’s not a “set it and forget it” system. And the final product isn’t finished compost—it’s a fermented pre-compost that needs soil contact to finish breaking down. If you don’t have garden space to bury it, you can’t use bokashi.

For apartment dwellers or people with small balconies, bokashi is an excellent option. You can collect a bucket of waste, take it to a community garden or a friend’s yard every few weeks, and bury it there. Or you can use a bokashi bucket indoors and then donate the fermented waste to a local farm or gardening group.

Frequently Asked Questions

Can I use bokashi compost in a worm bin?

Yes, but only in moderation. The fermented waste is very acidic (pH 3.5-4.0), and red wiggler worms (*Eisenia fetida*) prefer a pH of 6.0-7.0. If you add too much bokashi waste at once, it can kill your worms. Mix it with an equal volume of shredded cardboard or coconut coir to buffer the acidity, and add it in small amounts—no more than 1 cup per square foot of bin surface per week. The worms will eventually consume the fermented material, and the microbial activity will help break it down further.

How long does bokashi bran last?

Store-bought bokashi bran typically has a shelf life of 1-2 years if kept in a cool, dry place away from direct sunlight. Homemade bran, if properly dried, can last 6-12 months. I store mine in a sealed glass jar in the pantry, and it stays active for about 8 months. You can test the viability by adding a teaspoon of bran to a cup of warm milk—if it curdles within 24 hours, the microbes are still active. If nothing happens, the bran is dead and won’t work.

What do I do if my bokashi bucket is full but I’m not ready to bury it?

You can store a full, sealed bucket for several weeks or even months. The fermentation process stabilizes the waste, and as long as the bucket stays airtight, it won’t rot. I’ve kept a full bucket in my garage for 6 weeks during a rainy spring, and it was still fine when I finally buried it. Just drain the liquid regularly—if the waste sits in liquid for too long, it can start to break down anaerobically and produce odors.

Can I bokashi compost in winter?

Yes, but the fermentation slows down significantly in cold temperatures. The microbes are most active between 60-80°F (15-27°C). Below 50°F (10°C), the process can take 3-4 weeks instead of 2. If your bucket is in an unheated garage or basement, it will still work, just slower. You can speed it up by adding a heat mat or keeping the bucket in a warmer part of the house. The final product is still usable—just plan for the longer timeline.

Is bokashi composting safe for pets?

The fermented waste itself is safe—it’s essentially pickled food. But the bokashi bran and the liquid tea can cause digestive upset if consumed in large amounts. Keep the bucket lid sealed and store it out of reach of dogs and cats. If your pet licks a small amount of the liquid, they’ll likely be fine, but watch for vomiting or diarrhea. The bran is mostly wheat and molasses, so it’s not toxic, but the high microbial load can upset their gut flora.