From coffee grounds to mushroom to bitterbal
rotterzwam grows circular mushrooms on urban waste flows, thus connecting city, fungus, and system.
Waste as a breeding ground for change
Rotterzwam saves coffee grounds from being incinerated. We strive to use this valuable resource for mushroom cultivation. Any remaining or old coffee grounds are fermented or composted.
Contribute with your company or organization
Circular mushroom cultivation
At its nursery in Schiehaven in Rotterdam, rotterzwam processes various urban waste streams, such as coffee grounds, brewers' grains, and wood chips, for research and cultivation of various mushrooms.
Come by for a workshop or tour, or to pick up fresh, local and circularly grown mushrooms!
Workshops & tours
Growing your own mushrooms
At rotterzwam, we believe that knowledge sharing and collaboration are the path to a green, circular future. That's why we offer various educational programs.
Want to contribute to the circular economy at home? You can! With the rotterzwam grow kit, you'll learn how to grow oyster mushrooms on your own coffee grounds.
The rotterzwam grow kit
Taste the rotterzwam taste & vision
We are making urban waste streams restaurant-worthy again by turning our oyster mushrooms into delicious products such as bitterballen, croquettes, sausage rolls and soon also dumplings and ravioli.
You can taste Rotterzwam products at (company) restaurants and catering partners who, like Rotterzwam, believe in local, circular and plant-based food.
Rotter fungus in the catering industry
rot fungus grows
We are busy setting up a new, circular substrate factory , Sporo , so that in the future we can actually convert all coffee grounds into a fertile raw material.
We are also growing in and towards The Hague: gezwam is the name of a new nursery location in Schipluiden.
More about rot fungusrot fungus in numbers
rotterzwam believes in transparency. We say what we do and do what we say. In this report, you can view our interactive real-time data.