Abstract: The invention relates to a method for producing fungi, especially mushrooms, using a casing material comprising granules and/or agglomerates of granules of a mineral fibre structure, and to a casing material notably for the use in the production of fungi as well as a method for the preparation of a casing material. The invention furthermore relates to a casing spawn used for the inoculation of a casing material.The mineral fibres may be stone wool fibres, glass wool fibres, slag wool fibres, naturally occurring mineral fibre materials such as wollastonite and the like. The casing material may contain a binding agent, a nutrient source, a mineral source, a wetting agent, a pH-adjusting agent, a liming material, a fertilizer, a chelating agent and/or other excipients.