Shiitake 3790 Mushroom Spawn

Shiitake 3790 Mushroom Spawn – 5 lb Bag

Shiitake 3790 (Lentinula edodes) is a warm-weather strain selected for reliable fruiting at higher temperatures. If you are growing Shiitake during the summer months or in climate-controlled rooms held at warmer set points, 3790 is the strain that will perform. Shiitake remains one of the most popular gourmet mushrooms in North America, and having the right strain for your conditions is essential for consistent, high-quality production.

Why Growers Choose Shiitake 3790

• Warm-weather performance – Fruits reliably at 16–22°C, filling the summer production gap that cold-weather Shiitake strains cannot cover.
• Strong market demand – Shiitake is one of the most recognized and sought-after gourmet mushrooms in Canadian markets.
• Excellent quality – Produces thick-capped, dense fruit bodies with the classic Shiitake flavour and umami depth buyers expect.
• Proven genetics – Strain 3790 is a well-established production strain used by commercial farms across North America.

What You Get

Each 5 lb bag contains fully colonized organic millet grain spawn produced in-house at our CFIA-licensed facility in Brantford, Ontario. All spawn originates from lab-tested genetics to ensure clean, vigorous mycelium. Our sterile production process guarantees contaminant-free spawn ready for immediate use in your operation.

How to Use

Shiitake grain spawn works best on supplemented hardwood sawdust blocks. Mix spawn at a 10–15% rate into your hardwood sawdust and bran substrate, pack into grow bags, and sterilize or use pre-sterilized substrate. Colonize at 21–24°C for 8–12 weeks until blocks are fully brown and firm. Initiate fruiting by soaking blocks in cold water for 12–24 hours, then place in your fruiting environment. Shiitake can produce several flushes over multiple months.

Growing Conditions

• Fruiting temperature: 16–22°C (61–72°F)
• Humidity: 80–90% RH during fruiting
• Light: Indirect ambient or 12-hour cycle
• Fresh air: Moderate air exchange
• Substrates: Hardwood sawdust with wheat bran supplementation

For year-round Shiitake production, pair this warm-weather strain with our Shiitake 3782 Mushroom Spawn for the cooler months. Streamline your substrate prep with our pre-sterilized mushroom substrate.