United Kingdom
Type of business: Manufacturer

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.

Recommended as a Best Buy in Gardeners’ World magazine and in Which? magazine, the Green Johanna is an enclosed unit 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.
  • To maintain composting performance in cold weather and promote year-round hot composting temperatures the use of an Insulating Jacket is recommended.
  • 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.



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