From coffee grounds to mushroom to bitterbal
rotterzwam grows circular mushrooms on urban waste flows, thus connecting city, fungus, and system.
> 379,299 kg
coffee grounds rescued
> 22,626 kg
oyster mushrooms grown
> 134,488 kg eq
avoided CO2 emissions
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
Leer alles over de circulaire paddenstoelen teelt
Bij rotterzwam vinden we dat kennisdelen en samenwerken de weg is naar een groene, circulaire toekomst. Daarom bieden wij verschillende educatie-programma's aan. Van een 2-uur durende rondleiding, een meeloop training van een week tot aan stagiair of vrijwilliger: alle paddenstoelen liefhebbers zijn welkom om bij rotterzwam te komen leren.
De rondleidingen en workshops zijn ook uiterst geschikt voor een team- of schooluitje.
Workshops & rondleidingen
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