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Our Sustainability journey

At Ohau Gourmet Mushrooms (OGM!), sustainability is not just a buzzword—it’s the foundation of everything we do. Nestled in Ohau, just south of Levin, our small farm business has spent the last seven years redefining what it means to produce food that is not only delicious and nutritious but also ethical, local, and kind to the planet.

Finalist
Wellington Business Awards

We are proud to be selected as a finalist in the Post 2025 Gold Awards, in the Green category. This is in recognition of our commitment to sustainability. 
business award for sustainability

Rooted in Tradition, Driven by Innovation


Our journey began with a simple mission: to grow fresh oyster mushrooms using methods focused on 100% sustainable processes and ingredients.

We’ve innovated in many new and sustainable ways for mushroom growing. We pioneered the use of waste from New Zealand forestry, specifically Pine wood pellets, as the growing substrate.

Our production methods:

  • Use minimal water, with no runoff or waste.
  • Requires no pesticides or fertilisers.
  • Uses little space: 4kg of mushrooms can be grown per square meter, per week.
  • Have low energy use: Energy consumption is offset by solar production.

But we didn’t stop there. Two years ago, we launched the OGM! functional-food brand, expanding our range and deepening our commitment to sustainability. Within just six months, our efforts were recognised with two silver awards for outstanding New Zealand food, celebrating our Pink Oyster Mushroom Kimchi and Oyster Mushroom Risotto with Black Garlic.

For our food production, we use methods our great-grandparents would recognise—fermentation, pickling, and drying. These traditional techniques, paired with ingredients grown right on our organic farm, give our products unique health and nutritional benefits.

Our Permaculture Principles in Practice


Running a farm is complex, but permaculture guides every decision we make. This philosophy encourages us to see our farm as a series of interconnected systems, where nothing goes to waste

For example, the spent mushroom substrate—once used to grow mushrooms—becomes fuel for a compost-powered central heating system in winter. Hot water pipes run through the compost heap, harnessing the heat generated by decomposition to warm our grow rooms. Once the compost matures, it enriches our sandy soils, allowing us to grow vegetables like yacon for our products.

We also partner with local businesses, such as coffee roasters, to repurpose their waste coffee grounds. This boosts the nitrogen content of our compost, creating a richer, more productive soil—turning waste into a resource at every step.

Closing the Loop: Energy, Water, and Waste


Our commitment to sustainability extends to every corner of the farm:

  • Energy: We use thick, recycled polystyrene panels to insulate our incubation rooms, trapping natural heat and minimising the need for supplemental energy. Our growing rooms are repurposed shipping containers, lined with stainless steel and insulated for efficiency. Solar panels offset our electricity use, and we’re developing a biodigester to generate natural gas for recycling plastics on-site.
    Our electricity consumption average, for a 12-month period, is 39.8kWh per day (or about $12.75). This includes energy used across the entire farm and by our homestead. This consumption is offset by our solar array, which produces 8.4kWh per day.
  • Water: We are 100% water self-sufficient, harvesting rainwater and using a bore for irrigation. Our advanced septic system processes wastewater for orchard irrigation, and stormwater is managed through a restored wetland, ensuring nothing leaves our property untreated.
  • Waste: Our goal is zero waste. We use agricultural byproducts—pine pellets from forestry and soy hulls from the soy industry—as mushroom substrates. Our innovative use of hydrated lime for substrate preparation eliminates the need for energy-intensive sterilisation. The only significant waste we produce is plastic poly-tubing, which we store for future on-site recycling into farm building materials.

Regenerating Land and Community


We see ourselves as guardians of our land, and seek to leave it better than we found it.

Our farm sits on ancient dunes with poor soil, but through composting and permaculture, we’re turning unproductive land into fertile ground. Over two hectares are dedicated to diverse woodlands and wetlands, supporting biodiversity and carbon sequestration.

We believe in sharing our knowledge. We host farm tours, educational events, and are founding hosts for the ‘Open Farms NZ’ programme. We collaborate with horticultural and culinary students, welcome WWOOFers from around the world, and regularly speak at local schools and food events.

Economic and Social Sustainability


We’re not interested in mass production. Instead, we focus on niche, high-quality products that reflect our values and meet the growing demand for local, ethical food.

By controlling our supply chain and production, we ensure consistent quality and minimise waste. Our business model allows us to thrive while maintaining a small ecological footprint.

Our direct-to-customer sales at farmers’ markets and online have built strong relationships and valuable feedback loops. As we expand into select retail partnerships, we remain committed to working with those who share our vision for sustainable food systems.

Our sustainable future

Sustainability at OGM! is a continuous journey, one in which we are continually improving & evolving.

We’re excited to be working on a project to build a biodigester. This will allow us to create our own natural gas, which can then be used to recycle our plastics onsite.

From our compost-powered heating to our zero-waste ambitions, every innovation is a step towards a more regenerative, resilient food future. We’re proud to be part of a movement that sees food not just as a product, but as a story—one that connects people, planet, and purpose.

We invite you to join us on this journey. Whether you visit our farm, try our award-winning products, or simply share our story, together we can cultivate a greener, healthier tomorrow.

Kick Start Your own journey

Tours & Workshops

Contact us for a tour of our farm, or a workshop aimed at learning how you can incorporate sustainable practices in your own business.

Find us at a market

If you are in the Lower North Island, you have the option of tracking us down there. We are always open for a more in-depth conversation about sustainability.

Support us

Being a small business, the best way to support us and what we are doing is to buy our products. This allows us the ability to continue investing in our sustainable goals.
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