Rotterzwam grows oyster mushrooms on coffee grounds and sells them to restaurants and supermarkets. You may have tasted the oyster mushroom bitterballen.

Rotterzwam also sells a grow kit so people can use their coffee grounds at home to grow oyster mushrooms themselves. Rotterzwam fits in well with multiple of ifund’s objectives. Both organizations believe in a society that closes cycles, and we believe that waste flows are a source of food. We also stimulate the transition to a plant-based diet and ifund underlines the importance of local production. Rotterzwam has a local nursery where monthly 6,000 to 7,000 kilos of coffee grounds are converted into 1,200 to 1,400 kilos of oyster mushrooms.

Ifund has been involved with Rotterzwam since 2016, providing a loan to -among other things – buy containers in which the mushrooms are grown.