This research demonstrates how agricultural and forestry waste materials can be effectively converted into nutritious Reishi mushrooms through sustainable cultivation practices. Oak wood substrates produced the highest mushroom yields, while various agricultural wastes showed promising results for producing medicinal mushrooms. Using specialized spectroscopy techniques, scientists confirmed that the Reishi mushroom effectively breaks down and utilizes the complex plant materials in these waste substrates. This approach offers an environmentally friendly solution to waste management while producing valuable medicinal mushrooms.