Let’s find answers to your possible questions about mycelium, delivery, and more.


Any question mark in your mind? Don’t hesitate to contact us.


Will you strengthen our team? Click here to view our job openings.

Frequently Asked Questions

When will my order be shipped?

All orders are sent on the next Monday. So, all orders placed and paid before Sunday 23:59 will be shipped the next Monday. This also applies for Express shipments.

When will my order be delivered?

We cannot give a fixed delivery date. Our experience is that 90% arrives within 3-5 days and Express shipments within 1-2 days.

Do you ship to the UK ?

Yes, we ship to the UK.

Can I ship my order to a country outside of the EU?

Yes, it is possible to ship your order to a non-EU country. However:

  • We apply a minimum order value of €500
  • An admin fee of €25 applies
  • We require the customer to arrange pickup and customs clearance. Most do that by simply sending us a UPS / DHL / Fedex waybill and label. Once we package your order, we will send you the dimensions you need to do this. We make sure the products are ready-packed with 3 commercial invoices.

Feel free to reach out to us for additional questions about this!

Will my order be shipped carbon neutral?

Yes, we ship all our orders carbon neutral via UPS.

Is mycelium safe to use?

Mycelium is safe to use. It is mainly composed of natural polymers as chitin, cellulose, proteins, etc, so it is a natural polymeric composite fibrous material. But we definitely do not recommend eating the substrate.

Can mycelium be stored in wet areas?

It is better not to store mycelium in wet areas, because when the mycelium gets wet it will lose its strength. So, the material itself should be kept dry. Furthermore, other fungi might exist in wet areas which consider mycelium as nutrition. One way to protect it is by using a coating. On demand only, offers the coating of product for its customers

How can I change colour of mycelium?

There are two ways: use a biobased paint or a milk paint. We recommend using a milk paint. If you want the mycelium to do the work, you just need more time. That is a tricky process because growing the substrate too long means that you may see mushrooms coming out, which will weaken the base structure. We usually extend by one week to create darker, greyish but sometimes also brown or orange colours.

Is mycelium waterproof?

No, the material will lose rigidity and will become susceptible to degradation when repeatedly exposing it to water. It does repulse water for some time and it even floats! Of course, it not raining all the time. In between showers the material will passively dry and maintain some rigidity. But in the long run, it will lose.

We are working on the development of a bio-based coating that makes our material 100% waterproof.

I want to use my mycelium cool box to keep my food cooled. But are your materials suitable for food or beverage containers?

Our materials are not certified for direct food contact. The materials are water permeable and are not recommended for applications such as disposable cups.

Still have questions?

Get in touch!

Where to find us

Postal/billing address:
Bussumergrintweg 66
1217BS Hilversum
The Netherlands

Visiting/shipping address & factory:
Hogewaard 21D, 6624 KP Heerewaarden,
The Netherlands

GROWN bio office Germany:
Hofgründchen 65, 56564 Neuwied,

Chamber of Commerce nr. 72544503
Vat-id nr. NL859147551B01