The farm is the latest stage in the Country Estate Carbon Demonstrator Project, Blenheim’s collaboration with bioeconomy company Tumblebug.

The project unlocks the value of Blenheim’s organic waste, such as food, coffee and sheep wool.

Roy Cox, managing director for estates at Blenheim Palace, said it was “incredible” to see mushrooms grown using its own organic waste.

“The mushroom harvest is the final piece of the puzzle, which completes this self-sustaining circular ecosystem,” he said.

It received a five-star food safety hygiene rating from West Oxfordshire District Council.