Chestnut Mushroom Spawn

Chestnut Mushroom Spawn – 5 lb Bag

Chestnut mushrooms (Pholiota adiposa) are a gourmet favourite prized for their rich, nutty flavour and satisfying firm texture that holds up beautifully in cooking. As consumer demand for specialty mushrooms grows across Canada, Chestnut is becoming a staple at farmers markets and in restaurant supply chains. This grain spawn gives you the genetics to produce premium Chestnut mushrooms with the consistency and quality that buyers expect.

Why Growers Choose Chestnut

• Outstanding flavour – Deep, nutty taste and meaty texture set Chestnut apart from common oyster varieties, commanding higher prices at market.
• Firm, shippable fruit bodies – Dense caps and stems hold up well during harvest, packing, and transport.
• Growing consumer demand – Specialty mushroom interest is rising across Canada, and Chestnut fills a premium niche.
• Reliable production – Consistent flushes on supplemented hardwood substrates with good biological efficiency.

What You Get

Each 5 lb bag is packed with fully colonized organic millet grain spawn from our CFIA-licensed, sterile production facility in Brantford, Ontario. Every batch originates from lab-tested genetics and is produced entirely in-house. Our quality control process ensures you receive clean, vigorous spawn ready for immediate use.

How to Use

Mix grain spawn into supplemented hardwood sawdust at a 10–15% rate by weight. Chestnut mushrooms perform best on hardwood-based substrates with added bran supplementation. Pack inoculated substrate into grow bags and allow full colonization at 21–24°C. Once colonized, lower temperatures and introduce fresh air and humidity to trigger pinning. Chestnuts fruit in attractive clusters with coppery-brown caps.

Growing Conditions

• Fruiting temperature: 13–18°C (55–64°F)
• Humidity: 85–95% RH during fruiting
• Light: Indirect ambient or 12-hour cycle
• Fresh air: Moderate air exchange for well-formed caps
• Substrates: Hardwood sawdust, supplemented sawdust with bran

Pair with our pre-sterilized mushroom substrate for a streamlined workflow. Looking for another gourmet species? Try our Lion's Mane Mushroom Spawn.