Founded in the early 1990s and located in Harley, Ontario, the Mushroom Producers Cooperative Inc. (MPCI) produces high quality mushroom substrate or compost that provides the nutrients needed for mushrooms to grow in. MPCI has evolved over the past two decades into a superior mushroom composting operation implementing innovative technologies developed largely in Europe for the production of mushroom compost.

MPCI is a proud member of the Brant County Community, working with local farmers and committed to building the local economy.