Innovative Growing Medium for Gourmet Mushrooms: Regenerative Substrate Solutions

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As a small business dedicated to sustainable agriculture we took the decision seriously to continue opting for regenerative byproducts as our substrate for growing mushrooms. Using primarily saw dust from the local saw mill on the island was no longer an option due to lack of quantity required to grow the mushrooms on. We researched alternative substrates and finally came up with the idea to attempt using macadamia nut shells and husk along with the coffee parchment from the local coffee mill. It was a leap of faith, especially after combing the internet for references to using macadamia byproducts as a means to grow mushrooms and coming up with nothing. We continued to research how the mycelium would break down the tough lignin in the shells and husks similar to bark/saw dust, and finally decided that since there are over 5000 acres of macadamia nut orchards on the island - we’d at least be safe with the supply. We went for it - buying a small hammer mill so we could break down the particle size for appropriate substrate ratios. After a few months of working with the new substrate we perfected a recipe incorporating macadamia husk, coffee parchment, and a small amount of rice bran to boost yields. Thus began the new era of our mushroom farming journey using macadamia husks byproducts to continue our mission of cultivating high-quality mushrooms on Hawaii Island using regenerative byproducts from local agriculture. We continue to perfect our substrate recipe’s based on the type of mushrooms we’re cultivating and by transforming these materials into rich growing substrates we create a closed-loop system that supports sustainability, reduces waste, and nourishes our community.