Underground Mushroom Co.

Underground Mushroom Co. is a Gloucester, Massachusetts-based mushroom farm founded by Matt Pinstein during the COVID-19 pandemic. What began as a passion project quickly grew into a mycological operation focused on sustainability, local food systems, and community education.

Pinstein has spent roughly 20 years working in agriculture and local food production, building expertise that now shapes every stage of the mushroom growing process. The farm specializes in premium mushrooms grown in small batches with attention to soil health and mycelial diversity.

Beyond selling mushrooms, Underground Mushroom Co. is committed to education and low-waste practices. Pinstein leads workshops on indoor mushroom growing for both first-time growers and experienced cultivators. The business also sells spent substrate blocks to home gardeners each fall, a sustainable offering limited only by the farm's available storage space.