A cluster of mature king oyster mushrooms with brown caps and off-white stems stands on a black slate base next to a clear plastic bag containing grain spawn, with a wooden AggieTropicals brand tag in front, isolated on a white background.
A large natural substrate block specimen covered in numerous small gray-brown rounded growths, photographed on a blue-gray work surface with tools partially visible in the background.
A large cluster of small white to light beige mushrooms growing in a plastic bag, with similar bags visible in the background.
A large cluster of white to cream mushrooms growing on a clear plastic bag filled with substrate, photographed on a dark gray work surface in what appears to be a lab or greenhouse setting.
Several clear plastic bags filled with a beige and brown granular material, likely bedding or substrate, arranged on a stainless steel shelf.
A stainless steel countertop with a black and white digital scale on a white cutting board, next to a large white mesh panel. To the right are tall wire shelving units stocked with numerous clear plastic bags of brown and beige dried or ground ingredients, with glass jars and bottles on the lower shelf.
A three-tier gray utility cart loaded with multiple clear plastic bags filled with a tan-brown granular substance, photographed in a lab environment.
A stainless steel pressure cooker or sterilizer with its lid open, showing several brown rectangular blocks wrapped in white material inside a steaming basket, set on a tiled countertop in a kitchen-like environment.
  • Load image into Gallery viewer, A cluster of mature king oyster mushrooms with brown caps and off-white stems stands on a black slate base next to a clear plastic bag containing grain spawn, with a wooden AggieTropicals brand tag in front, isolated on a white background.
  • Load image into Gallery viewer, A large natural substrate block specimen covered in numerous small gray-brown rounded growths, photographed on a blue-gray work surface with tools partially visible in the background.
  • Load image into Gallery viewer, A large cluster of small white to light beige mushrooms growing in a plastic bag, with similar bags visible in the background.
  • Load image into Gallery viewer, A large cluster of white to cream mushrooms growing on a clear plastic bag filled with substrate, photographed on a dark gray work surface in what appears to be a lab or greenhouse setting.
  • Load image into Gallery viewer, Several clear plastic bags filled with a beige and brown granular material, likely bedding or substrate, arranged on a stainless steel shelf.
  • Load image into Gallery viewer, A stainless steel countertop with a black and white digital scale on a white cutting board, next to a large white mesh panel. To the right are tall wire shelving units stocked with numerous clear plastic bags of brown and beige dried or ground ingredients, with glass jars and bottles on the lower shelf.
  • Load image into Gallery viewer, A three-tier gray utility cart loaded with multiple clear plastic bags filled with a tan-brown granular substance, photographed in a lab environment.
  • Load image into Gallery viewer, A stainless steel pressure cooker or sterilizer with its lid open, showing several brown rectangular blocks wrapped in white material inside a steaming basket, set on a tiled countertop in a kitchen-like environment.

King Oyster Mushroom Grain Spawn Bag

Aggietropicals
100.00 SR
100.00 SR
Sold out
Tax included. Shipping calculated at checkout.

Start your mushroom cultivation with our premium King Oyster Grain Spawn, available in approximately 1.5 kg units. King Oyster (Pleurotus eryngii) is produced as second-generation (G2) grain spawn from carefully selected commercial fruiting genetics chosen for vigorous mycelial growth, rapid colonization, thick stem development, excellent biological efficiency, and consistent yields. Each bag contains fully colonized premium corn grain, providing a vigorous inoculum ready for expansion onto pasteurized or sterilized bulk substrates.

Every grain spawn bag is prepared under strict sterile laboratory conditions and inspected before shipment to ensure vigorous, contamination-free colonization. King Oyster is prized for its thick, meaty stems, broad caps, excellent shelf life, rich umami flavor, and outstanding culinary versatility, making it one of the world's most popular gourmet mushrooms. Grain spawn is ideal for inoculating a wide variety of hardwood-based bulk substrates for reliable mushroom production.

Freshly Prepared:

To ensure maximum viability and vigor, every grain spawn bag is prepared fresh to order. Please allow approximately 2–3 weeks for grain preparation, sterilization, inoculation, complete colonization, quality inspection, and packaging before shipment.

Product Details:

Approximately 1.5 kg fully colonized premium corn grain spawn
Produced as second-generation (G2) grain spawn
Carefully selected commercial fruiting genetics
Prepared under sterile laboratory conditions
Packaged in a heavy-duty Type T Unicorn Bag with a 0.2-micron filter patch
Ready to inoculate pasteurized or sterilized bulk substrates
Intended for gourmet mushroom cultivation

Storage:

For best results, use the grain spawn as soon as possible after arrival. If storage is necessary, keep refrigerated at 2–8°C (35–46°F) and protected from direct light. Do not freeze. Fresh grain spawn provides the most vigorous colonization.

Quality Guarantee:

Every grain spawn bag is visually inspected before shipment to verify vigorous colonization and the absence of visible contamination. If your grain spawn is confirmed to be contaminated upon arrival, contact us promptly with clear photographs within 24 hours of delivery. We will review the claim and, if confirmed, provide a replacement at no additional charge.

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