White Oyster Mushroom Spawn

White Oyster Mushroom Spawn – 5 lb Bag

White Oyster mushrooms (Pleurotus ostreatus) are a culinary favourite prized for their delicate, mild flavour and tender texture. This strain is a top choice for growers supplying restaurants, farmers markets, and grocery retailers who want a clean, attractive mushroom with broad consumer appeal. Our White Oyster grain spawn gives you the genetics and vigour to produce market-quality mushrooms flush after flush.

Why Growers Choose White Oyster

• Mild, versatile flavour – Appeals to a wide customer base, from chefs to home cooks, making it easy to sell at market.
• Attractive presentation – Clean white clusters look beautiful on display and hold up well during transport.
• Reliable performance – Aggressive colonizer with consistent yields across multiple flushes on a variety of substrates.
• Wide substrate compatibility – Performs well on straw, hardwood sawdust, and masters mix, giving you flexibility in your production setup.

What You Get

Each 5 lb bag contains fully colonized organic millet grain spawn manufactured in our sterile production lab in Brantford, Ontario. Our facility is CFIA-licensed, and every batch starts from lab-tested genetics to guarantee clean, vigorous spawn. Because we produce everything in-house, we maintain strict quality control from culture to bag.

How to Use

Mix the grain spawn into your prepared substrate at approximately 10–15% spawn rate by weight. White Oyster colonizes quickly on pasteurized straw and performs exceptionally well on supplemented hardwood sawdust blocks packed into grow bags. Keep colonizing bags at 21–24°C in a dark, clean space. Once fully colonized, introduce fruiting conditions with fresh air exchange, humidity, and indirect light.

Growing Conditions

• Fruiting temperature: 15–21°C (59–70°F)
• Humidity: 85–95% RH during fruiting
• Light: Indirect ambient or 12-hour lighting cycle
• Fresh air: Moderate air exchange for well-formed caps
• Substrates: Pasteurized straw, hardwood sawdust, masters mix

Want to explore more oyster options? Our Pink Oyster Mushroom Spawn offers a tropical twist, or browse the full range of Canadian-made mushroom spawn in our shop.