How to use bokashi bran: the mistake I see most

By Joe Barrington, founder of Dr Forest · Published May 2026 · Updated 6 November 2026

Quick answer. To use bokashi bran, sprinkle two to three tablespoons over each layer of food scraps in an airtight bucket (double it over meat or fish), press the air out and keep the lid shut. The bran is wheat bran fermented with lactic acid bacteria and yeasts, then dried. Those microbes pickle the scraps, so meat, dairy and cooked food can go in. When the bucket is full, leave it sealed for two weeks, then bury it or add it to a compost heap. Buried, it turns to soil in two to four weeks.

The mistake I see most is not pressing the food scraps down, so there's still oxygen in there. Press every layer until the air is out. The other is keeping the bin in the garage, or anywhere cold: in winter it won't ferment very quickly, so bring it indoors.

What's in a bag of bokashi bran

Three things: wheat bran, molasses and an effective-microorganism (EM) culture, the same kind sold as liquid EM-1. The microbes feed on the molasses and multiply, then the bran is dried. They stay dormant in the bag and wake up when they meet a damp scrap. If you'd rather brew a cheap culture from local microbes, my guide to JADAM microbial solution (JMS) compares it with EM-1 and bokashi bran.

The microbes in the bran

Lactic acid bacteria do most of the work. They turn the sugars in food into lactic acid, which sours the bucket and holds back rot. Yeasts feed them and give bokashi its faint bready smell, and photosynthetic bacteria make up the rest of the culture.

A four-year Swiss field trial found living EM no better on the soil than the same culture sterilised: the small gains came from the nutrients in the bokashi [1]. The benefit is getting all your food waste back into the ground as a soil conditioner.

How fermentation differs from composting

A compost heap needs air: aerobic microbes break the waste down, and a hot heap can reach 60°C. A bokashi bucket is sealed, so the food ferments instead. The acid stops it going putrid, which is why the bucket can take meat, dairy and cooked food.

Aerobic versus anaerobic

	Traditional composting	Bokashi
Process	Aerobic (needs air)	Anaerobic (sealed)
Time to finish	3 to 12 months	2 weeks sealed, then 2 to 4 weeks in soil
What it takes	Raw veg, paper, garden waste	All kitchen waste, including meat, dairy and cooked food

If you have room, run both: the bucket for kitchen scraps and a heap or wormery for grass, leaves and prunings.

How to use bokashi bran, step by step

Inside the bucket

You need an airtight bucket with a sealing lid, a perforated false floor to hold the scraps above the juice, and a tap at the base. A 16-litre bin fits under most sinks. With two, you can fill one while the other ferments.

The seven-step routine

1. Sprinkle a teaspoon of bran on the empty base.
2. Add scraps in layers, cut to about 5 cm.
3. Sprinkle two to three tablespoons of bran over each layer, and double it over meat or fish.
4. Press the air out with a potato masher or a piece of cardboard.
5. Seal the lid tightly between additions. Open it once a day at most, and wipe the rim first.
6. Drain the juice every 2 to 3 days and use it the same day.
7. When the bucket is full, leave it sealed for two weeks and start filling the second one.

What happens during the two weeks

The contents turn sour and acidic. By around day 14 the food is soft, still holds its shape and smells sweet and sour, like pickle. A white bloom on the surface is normal yeast.

What you can (and can't) put in a bokashi bin

The RHS says nearly all food waste can go in, including cooked food and meat [2].

What goes in, what stays out

Goes in	Stays out
Raw and cooked veg, plate scrapings (drain off oil)	Free liquids such as oil and milk
Meat, fish, cheese, butter, yoghurt	Mouldy or rotten food
Small bones (slow, so crush them)	Carcasses and large bones
Bread, pasta, cooked rice	Pineapple crowns, corn cobs, garden waste
Citrus peel, onion and garlic skins	Pet faeces, cat litter
Coffee grounds, paper tea bags, eggshells	Packaging, plastic-coated tea bags, stickers

Shop-bought citrus peel brings its anti-mould treatments with it: in a 2026 household-scale bokashi trial, imazalil and pyrimethanil residues held steady or rose during fermentation [3]. Leave the peel out if you'd rather not dig those into a veg bed.

When the bucket is full: what to do with the pre-compost

Pickled scraps aren't compost yet. Soil life finishes the job, and there are three ways to hand it over.

Three ways to finish the pre-compost

Trench burial

Dig 20 to 30 cm deep in a bare patch, tip the bucket in, mix it lightly with the soil and cover it. Leave it two weeks before planting directly on top [2], while soil life takes the edge off the acidity.

The speed surprised me the first time. I went back to a trench a few weeks later and put the spade in. It had been much faster than I anticipated, and much more absolute. There was nothing left to recognise. It was all soil.

Compost heap addition

Fold it into the middle of the heap, where the RHS says it breaks down very quickly [2]. Use an enclosed bin: fermented food on an open heap can draw rats and foxes.

Finishing in soil

Mix one part pre-compost with three parts garden soil in a tub, cover it and leave it for three or four weeks. That gives you a planting mix for pots, or something to dig into beds alongside other organic soil amendments. A wormery will take it too, a little at a time.

The juice at the bottom (bokashi tea)

Use the juice within 24 hours of draining it.

• As a plant feed, dilute it 1:100, about 10 ml per litre, and water it onto the soil around plants.
• Pour any you don't need neat down the kitchen or bathroom drain.
• On a slow compost heap, pour it straight on. It adds microbes and a little moisture.

Common problems and quick fixes

A rotten smell or fruit flies mean air is getting in. Press the contents down hard, double the bran on the next layer and clean the lid seal. A white bloom on top is fine. A lot of black, blue or green mould means the batch has gone wrong: tip it into the middle of a compost heap and start again.

Related: Bokashi Bran · Liquid EM-1 culture · Grow-Kashi · EM and bokashi composting

Common questions

What can you put in a bokashi bin?

Almost any kitchen food waste, including meat, fish, dairy and cooked food. Leave out free liquids, mouldy or rotten food, large bones and packaging.

How long does a bag of bokashi bran last?

Stored cool, dry and sealed in its bag, the bran keeps for at least 12 months. At a light sprinkling of about 30 g per bucket, a 1.5 kg bag does around 50 full 16-litre buckets, and fewer at the full rate of two to three tablespoons a layer.

How much bokashi bran do I use?

Two to three tablespoons over each layer of food waste, every time you add scraps. Double it over meat or fish.

Can you use bokashi bran without a special bin?

Yes, any airtight bucket with a sealing lid works. Drill holes in the base and stand it in a second bucket to catch the juice.

What does bokashi smell like when it's working?

Sweet and sour, like pickle. A putrid smell means air has got in or there's too little bran.

Can bokashi pre-compost go straight onto plant roots?

No, it's strongly acidic straight from the bucket. Bury it and wait two weeks before planting, or compost it first.

Can you make your own bokashi bran?

Yes: the usual bokashi bran recipe is to dampen bran with 1 part liquid effective-microorganism culture, 1 part molasses and 20 parts water. Pack it tightly into a bag, keep it somewhere warm for 10 to 14 days, then dry it.

What is your bokashi bran made from, and does it contain wheat?

It's wheat bran fermented with an effective-microorganism culture and molasses, then dried. So yes, it contains wheat.

Are rats attracted to bokashi compost?

Not to a sealed bin. Once it's out, bury it 20 to 30 cm deep straight away or use an enclosed compost bin.

What happens if you leave bokashi too long?

A few extra weeks sealed is fine if the lid stays airtight. If it then smells rotten, put it in a compost heap and keep it off the beds.

What are the downsides of using bokashi bran?

It's a two-stage process, so you need a bed, planter or heap to finish the pre-compost. You also need a steady supply of bran.

How long does bokashi take to break down in soil?

Usually two to four weeks once buried, depending on soil temperature. From starting the bin to finished soil, allow five to ten weeks.

Does bokashi really work?

Yes. It ferments kitchen food waste, meat and dairy included, in about two weeks, and the benefit comes from returning that waste to the ground.

Can you keep a bokashi bin outside?

You can, but it works best indoors. The microbes slow below about 10°C, so an outdoor bin will ferment slowly or stall in a UK winter.

Joe Barrington

Founder of Dr Forest in Stockport. Joe formulates and blends his own range of feeds, and stocks other soil products alongside them, including bokashi bran and EM-1.

Sources cited

1. Mayer, J., Scheid, S., Widmer, F. et al. (2010). How effective are 'Effective microorganisms® (EM)'? Results from a field study in temperate climate. Applied Soil Ecology 46(2): 230 to 239. doi.org/10.1016/j.apsoil.2010.08.007
2. Royal Horticultural Society. How to recycle food waste with bokashi. rhs.org.uk
3. Lányi, K., Szita, M., Lucsányi, G.R. et al. (2026). Fate of post-harvest fungicides and microbial dynamics in a household Bokashi-based fermentation system: implications for urban organic waste management. Urban Science 10(11): 613. doi.org/10.3390/urbansci10110613