The mixture is placed in a coffin-shaped mould and put in a “climate room” to grow for seven days.
They’re suitable for traditional burials, natural burials and cremation.
While they’re now available in New Zealand, they’re currently only grown in the Netherlands.
Hendrikx hopes to gain enough traction to grow them here and cut down on emissions from shipping.
“As a sustainable entrepreneur [it] is of course a big challenge because you have these ambitions and yet there’s… also… the financial reality.”
Everywhere they ship to, they try and offset their carbon, he said. In New Zealand they are investing in wind.
Hendrikx said the biggest challenge when growing the mushrooms themselves is to ensure they remain only one species.
When the project first launched overseas he was surprised to see support from as far away as Australia and New Zealand, he said.
Australia had its first burial with a mushroom-grown coffin last week and three families showed interest here on launch day.
“I think it makes sense because you guys have a very beautiful relationship with nature.”
While the price was dependent on each funeral direction, Hendrikx said they would be sold at a similar price to a traditional coffin.