Stock Photo - 19 April 2021, Bavaria, Nuremberg: Pigeon blue oyster mushrooms grow from a mushroom growing set by Ralph Haydl - a mushroom substrate consisting of coffee grounds with mushroom spawn. Next to it lies old coffee grounds on a plate. The 41-year-old from Nuremberg has been selling mushroom cultivation sets for several years, which can be used to grow various oyster mushrooms, yellow lemon mushrooms or pink rose mushrooms at home. (to dpa ""Delicious mushrooms on old coffee - niche or trend?"") Photo: Daniel Karmann/dpa. - Nuremberg/Bavaria/Germany

Stock Photo: 19 April 2021, Bavaria, Nuremberg: Pigeon blue oyster mushrooms grow from a mushroom growing set by Ralph Haydl - a mushroom substrate consisting of coffee.

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