A culture medium composition for cultivating Ganoderma lucidum or Lentinus edodes, and a cultivating method by using the composition are provided to improve the taste and perfume of mushroom by reducing the offensive odor. A culture medium composition for cultivating Ganoderma lucidum or Lentinus edodes comprises 3-25 parts by weight of a green tea powder based on 100 parts by weight of the culture medium mixture. Preferably the green tea powder has an average particle size of 3-80 mesh.
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