Blog

Recipe: creamy oyster mushroom soup

For anyone who has just harvested mushrooms from their grow kit , or received them at the mushroom event , we present a particularly delicious recipe: oyster mushroom soup. It's versatile, from a ...

The Mushroom Learning Network Community Platform

In recent months, we've seen people, companies, and organizations across various social media platforms being denied access to their accounts for unclear reasons. It's a trend visible on Twitter, ...

CO2 certificates for sale

Rotterzwam has been making a significant environmental impact since 2013. Since 2017, we've been working to quantify and map this impact. In 2020, our primary business activities generated 9,409 ki...

The impact of rot fungus in 2020

It's a year we'll quickly leave behind. But not before we take stock of the impact we've made in the past year. While that impact was considerably less than the year before, we still managed to sa...

Rising waste costs? Not at Rotterzwam!

We've also never changed the price of our coffee grounds. We've been charging the same prices for our service since 2014.

New vegan oyster mushroom spread

Every cloud has a silver lining. Or something like that. ;-) Due to the coronavirus pandemic, there's finally time to occasionally revamp some old recipes. In October 2020, we pulled an old oyster...

More energy produced than it consumes!

Born in BlueCity010 and expanded to De Kroon in 2019. 2020 was our nursery's first full year of operation. This finally gave us a complete overview of last year's consumption and production. Gue...

Important step towards B-Corp certification

At the end of 2020, we implemented a bylaw amendment that prepares rotterzwam for B Corp certification. B Corp stands for Benefit Corporation. B Corps are certified by the non-profit organization B...

Separately collecting coffee grounds is not always sustainable

Throwing coffee grounds away with residual waste is a waste because they end up incinerated. But did you know that separate coffee grounds collection isn't always sustainable? It's all about wha...

Sustainable letterbox packages for home workers

Today we're sending out the first batch of these fun, sustainable mailbox packages for some of our customers. They're a sustainable gift for those working from home. Before the pandemic, 70% o...

Sustainable oyster mushrooms for sale!

After the fire in 2017, we were unable to produce mushrooms for two years. But on May 23, 2019, we opened a brand-new nursery, and oyster mushrooms are now rolling out of the containers again. Sin...

We close the webshop on Block Friday

The moon landing of our time is to bring our lifestyle and economy within the confines of our single planet. In our view, this means we must live more consciously and not pursue the eternal growth...

Organic waste flows on the soil: what are the legal implications?

This blog series is about our "Back to the Soil" project, in which we investigate whether various organic waste streams can be used as soil improvers in arable farming and how this can be legally a...

Waste legislation: what is waste?

This blog series is about our "Back to the Soil" project, in which we investigate whether several organic waste streams can be used as soil improvers in arable farming and how this can be legally m...

Learn to grow mushrooms online

For several years now, we've been offering online learning opportunities about mushroom cultivation. We have e-learning programs for both beginning home growers and more experienced vegetable garde...