The combination of a Green Johanna with an Insulating Jacket helps to achieve year-round hot composting temperatures of around 30 – 60 + degrees Celsius and to maintain the composting process in cold weather.

The jacket helps you to control the compost temperature. As well as using it to raise temperatures, you can remove it to cool the bin down, for example if the compost temperature exceeds 70 degrees C, as this will be too hot for the composting microbes to survive and the process will stall.

The Green Johanna

Recommended as a Best Buy in Gardeners’ World magazine and in Which? magazine, the Green Johanna is a top-performing hot composter that turns food waste - including cooked food, meat, fish and dairy - and garden waste into quality compost within months.

The Johanna is an enclosed container with a perforated integrated base plate that allows access to worms and micro-organisms while deterring rodents. Made in the UK from 100% recycled plastic, it has a five-year guarantee and expected lifespan of 10 years or more. 

  • Secure twistable lid helps to regulate ventilation.  
  • Patented airflow system.
  • Two secure sliding hatches mean finished compost is easy to access but won’t leak out before you need it.
  •  Best placed on a flat patch of soil or grass.
  • One Johanna is designed to cope with the average food waste of a household of five and compostable waste from an average garden. 
  • In the first year it may take 6-8 months to get your first batch of compost. After that it should take 4-6 months. 
  • Aerating stick also supplied. Made from 100% recycled plastic (may differ from images on the website and elsewhere).
  • Self-assembly (the base plate and four modular sections screw together).
  • Modular sections mean that it’s possible to remove more compost by unscrewing sections if you wish. Also, if one section becomes damaged that section can simply be replaced.
  •  If bones are added to the Johanna they will not be broken down so it would be necessary to remove stripped-down bones from the finished compost. For this reason we do not recommend that bones are added. 

The Insulating Jacket

The jacket comprises three circular sections and a lid piece, all made from foamed polyethylene.

When fitting the jacket be sure to leave a gap at the bottom so that the vents are not covered. The jacket fits snugly so there is no space for cold air to circulate.

Pull the jacket sections down so they overlap the section below by about 5cms, ensuring that the ventilation holes at the top and bottom of the composter remain uncovered.  

It’s important that these ventilation holes are left clear or the ventilation system will not function.  

The Insulating Jacket must be removed in order to get compost out of the Johanna.

 For more information please download our Green Johanna composting handbook.

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Made in the UK
Weight 9.5kg
Length 820mm
Width 820mm
Height 940mm
Colour Green
Material Plastic
Capacity (L) 330

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Green Johanna Winter Jacket



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