Black Pearl King Oyster Mushroom Spawn

Black Pearl King Oyster Mushroom Spawn – 5 lb Bag

Black Pearl King Oyster (Pleurotus ostreatus x eryngii hybrid) combines the best traits of two outstanding species. You get the aggressive growth habit and forgiving nature of oyster mushrooms paired with the thick, meaty stems and rich flavour of King Oyster. The result is a hybrid strain that produces impressive clusters of dense, high-quality mushrooms ideal for gourmet markets and restaurant supply across Canada.

Why Growers Choose Black Pearl King Oyster

• Best of both worlds – Thick, meaty stems like King Oyster with the vigorous clustering habit of standard oyster varieties.
• Gourmet appeal – Rich, umami flavour and firm texture make it a chef favourite, commanding premium pricing.
• Easier than pure King Oyster – More forgiving growing conditions and faster colonization compared to traditional King Oyster strains.
• Excellent shelf life – Dense fruit bodies hold up well during storage and transport, reducing post-harvest waste.

What You Get

Each 5 lb bag contains fully colonized organic millet grain spawn from our sterile, CFIA-licensed production facility in Brantford, Ontario. All genetics are lab-tested to ensure purity and vigour. We produce every batch of grain spawn in-house, maintaining complete quality control throughout the process.

How to Use

Mix grain spawn into supplemented hardwood sawdust at a 10–15% rate. Black Pearl King Oyster performs best on supplemented sawdust blocks with wheat bran or soy hull additions. Pack inoculated substrate into grow bags, seal, and colonize at 21–24°C. Once fully colonized, open bags and introduce fruiting conditions. This hybrid produces attractive clusters with thick stems and medium-sized dark caps.

Growing Conditions

• Fruiting temperature: 15–21°C (59–70°F)
• Humidity: 85–95% RH during fruiting
• Light: Indirect ambient or 12-hour cycle
• Fresh air: Moderate air exchange for balanced stem and cap development
• Substrates: Supplemented hardwood sawdust

Explore other oyster varieties like our King Blue Oyster Mushroom Spawn or pair this spawn with our pre-sterilized mushroom substrate for a ready-to-go workflow.