Heartwood Mushrooms Ltd

Heartwood Mushrooms: Manitoulin Island's Fungi Pioneers

On Manitoulin Island, the largest freshwater island in the world, Shane O'Donnell and Jaime Rowntree are running a mushroom operation that has become one of the most talked-about agricultural businesses in Northern Ontario. Heartwood Mushrooms Ltd, based in Little Current, has been growing gourmet mushrooms since 2016, and in that time they've built something that goes well beyond a typical small farm.

The O'Donnell and Rowntree Partnership

Shane O'Donnell co-founded Heartwood Mushrooms in 2016 with a straightforward goal: grow the tastiest, most sustainable mushrooms possible, and show the world that fungi are more than a pizza topping. That mission has resonated. Together with co-owner Jaime Rowntree, the operation has expanded from its early days into a multi-product business that includes fresh oyster mushrooms, functional mushroom extracts, mushroom spice blends, and grow kits for home cultivators.

The partnership between O'Donnell and Rowntree brings complementary strengths to the operation. Building a mushroom business on Manitoulin Island means dealing with logistical challenges that urban growers never face, including remote supply chains, limited local market size, and the realities of Northern Ontario weather. Making it work requires both farming skill and business acumen.

Products That Tell a Story

Heartwood's product line reflects a deliberate strategy of extracting maximum value from their growing operation. Fresh oyster mushrooms are the foundation, but the business extends into value-added territory with functional mushroom extracts sold as tinctures, a mushroom spice powder designed to add umami depth to cooking, and grow kits that let customers experience mushroom cultivation at home.

Perhaps most interesting is their approach to waste. Spent mushroom substrate, the material left over after mushrooms have been harvested, gets repurposed into "garden booster blocks" rather than heading to a landfill. It's a closed-loop approach that turns a waste stream into a revenue stream, and it aligns with the sustainability ethos that runs through everything Heartwood does.

Education as a Core Mission

Heartwood Mushrooms has invested heavily in education. They run a free mycology community, offer classroom activities, and maintain an active blog covering cultivation techniques and the broader world of fungi. For a small operation on a remote island, this educational commitment serves multiple purposes. It builds brand awareness far beyond the local market, creates customer loyalty, and positions Heartwood as a knowledge leader in the Canadian mushroom space.

O'Donnell's stated goal of changing how people see fungi is not just marketing language. The educational programming, the diverse product line, and the community engagement all point to a business that genuinely wants to shift public perception of mushrooms from commodity ingredient to something worth understanding and celebrating.

Northern Ontario's Mushroom Standard

A perfect 5-star rating across 33 reviews is remarkable for any agricultural business, and it's particularly impressive for one operating in a region where customer acquisition requires extra effort. Manitoulin Island draws tourists in summer, but the year-round customer base is modest. Building a sustainable business there means earning fierce loyalty from every customer you touch.

Heartwood ships across Canada with free shipping on orders over $100, which extends their reach well beyond the island. But the local connection remains central to the brand. They're a fixture at the Manitoulin Marketplace and a point of pride for a community that values entrepreneurship and self-sufficiency.

You can find Heartwood Mushrooms at heartwoodmushrooms.ca.