Rotterzwam believes in a society that closes loops, uses raw materials to the maximum of their potential and consumes more plant proteins than animal proteins.

We do that by collaborating local, regional and international to stimulate the production of mushrooms and make that process more efficient.  

The result is a wide variaty of products and services around mushroom production, awareness and lovely snacks based on plant proteins.

Start your own farm?

Read all on our master program 
to start your own farm

Collect coffee at your company?

Want us to collect the coffee from your company? 
Join our program

Grow at home?

Become a kitchen farmer and grow fresh
mushrooms on your own coffee grounds

Buy fresh oyster mushrooms?

Do you own a restaurant in 010? Are you from Rotterdam and do you want to purchase fresh oyster mushrooms?


Our mission for the the coffee grounds
being wasted in our society

Get a dose of inspiration?

Do a tour through our farm.
Or book us as speaker on your venue.


kg mushrooms produced 


coffee grounds safed from incineration


kitchen farmers


entrepreneurs trained in master program