The present invention relates to the use of specific terpenes, or of essential oils composed predominantly thereof, as biostimulants in the production of mycelia and the cultivation of fungi. The invention more particularly relates to the use of at least one beta-pinene, delta-3-carene or beta-phellandrene essential oil chemotype, or of at least one terpene selected from beta-pinene, delta-3-carene or beta-phellandrene, or a mixture thereof, for stimulating the development and growth of mycelia and edible fungi.