A cluster of King Oyster mushrooms with thick white stems and small dark brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING OYSTER - Premium Spawn Genetics", on a white background.

King Oyster Mushroom Grain Spawn Bag

G2 / USA-1
100.00 SR
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A cluster of King Oyster mushrooms with thick white stems and small dark brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING OYSTER - Premium Spawn Genetics", on a white background.
  • A cluster of King Oyster mushrooms with thick white stems and small dark brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING OYSTER - Premium Spawn Genetics", 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.
  • Dense flush of young King Oyster pins on a colonized bag
  • Fully colonized grain spawn bags on a stainless steel shelf
  • Grain spawn bags in our pressure sterilizer with the lid open
  • 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 cluster of King Oyster mushrooms with thick white stems and small dark brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING OYSTER - Premium Spawn Genetics", 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.
  • Dense flush of young King Oyster pins on a colonized bag
  • Fully colonized grain spawn bags on a stainless steel shelf
  • Grain spawn bags in our pressure sterilizer with the lid open
  • 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.
King Oyster Mushroom Grain Spawn Bag

King Oyster Mushroom Grain Spawn Bag

100.00 SR
Generation
Strain
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Two sterilized grain spawn bags with self-healing injection ports on a shelf Grain Spawn Kit - Choose Your Species A cluster of King Oyster mushrooms with thick white stems and small dark brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING OYSTER - Premium Spawn Genetics", on a white background. King Oyster Mushroom Grain Spawn Bag A dense cluster of Pioppino mushrooms with slender stems and brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, PIOPPINO - Premium Spawn Genetics", on a white background. Pioppino Mushroom Grain Spawn Bag A rounded Lion's Mane mushroom formed of cascading white icicle-like spines on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, LION'S MANE - Premium Spawn Genetics", on a white background. Lion's Mane Mushroom Grain Spawn Bag A rounded Bear's Head mushroom formed of white branching spines on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, BEAR'S HEAD - Premium Spawn Genetics", on a white background. Bear's Head Mushroom Grain Spawn Bag A cluster of off-white lion's Paw mushrooms next to a clear plastic bag containing a white powder and brown capsules, with a wooden brand tag reading AggieTropicals, on a white background. Lion's Paw Mushroom Grain Spawn Bag A coral tooth mushroom display next to a clear plastic pouch containing a white powder and brown granules, with a wooden tag reading AggieTropicals Coral Tooth - Premium Spawn Genetics, on a white background. Coral Tooth Mushroom Grain Spawn Bag A cluster of off-white wolf's bloom lion's mane mushrooms next to a clear plastic bag containing white spore powder and brown spore print, with a wooden brand tag reading AggieTropicals on a white background. Wolf's Bloom Lion's Mane Mushroom Grain Spawn Bag A Maitake mushroom formed of overlapping grey-brown fan-shaped caps in a dense rosette on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, MAITAKE - Premium Spawn Genetics", on a white background. Maitake Mushroom Grain Spawn Bag A dense cluster of King Blue Oyster mushrooms with blue-grey fan-shaped caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING BLUE OYSTER - Premium Spawn Genetics", on a white background. Blue Oyster Mushroom Grain Spawn Bag A dense cluster of Pink Oyster mushrooms with vivid pink fan-shaped caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, PINK OYSTER - Premium Spawn Genetics", on a white background. Pink Oyster Mushroom Grain Spawn Bag A cluster of Golden Oyster mushrooms with bright yellow fan-shaped caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, GOLDEN OYSTER - Premium Spawn Genetics", on a white background. Golden Oyster Mushroom Grain Spawn Bag A dense cluster of Princess Pearl mushrooms with creamy white ruffled caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, PRINCESS PEARL - Premium Spawn Genetics", on a white background. Princess Pearl Mushroom Grain Spawn Bag A dense cluster of Sporeless Oyster mushrooms with white fan-shaped caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, SPORELESS OYSTER - Premium Spawn Genetics", on a white background. Sporeless Oyster Mushroom Grain Spawn Bag A cluster of Shiitake mushrooms with brown caps and cream-colored gills on thick stems on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, SHIITAKE - Premium Spawn Genetics", on a white background. Shiitake Mushroom Grain Spawn Bag A dense cluster of Chestnut mushrooms with small golden-brown caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, CHESTNUT - Premium Spawn Genetics", on a white background. Chestnut Mushroom Grain Spawn Bag A Reishi mushroom with a glossy reddish-brown lacquered shelf-shaped cap on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, REISHI - Premium Spawn Genetics", on a white background. Reishi Mushroom Grain Spawn Bag A Turkey Tail mushroom formed of thin fan-shaped caps with multicolored bands on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, TURKEY TAIL - Premium Spawn Genetics", on a white background. Turkey Tail Mushroom Grain Spawn Bag A cluster of King Stropharia mushrooms with reddish-brown caps and a ring on the stem on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, KING STRAPHARIA - Premium Spawn Genetics", on a white background. King Stropharia Mushroom Grain Spawn Bag A cluster of Enoki mushrooms with long thin stems and small tan caps on a dark slate board, beside a clear plastic bag of grain spawn colonized with white mycelium, with a wooden tag reading "AggieTropicals, ENOKI - Premium Spawn Genetics", on a white background. Enoki Mushroom Grain Spawn Bag

Ships fresh to order

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48-hour damage protection

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 3–4 weeks for G2 or 4–6 weeks for made-to-order G1 for grain preparation, sterilization, inoculation, complete colonization, quality inspection, and packaging before shipment.

We only offer G2 for strains we are actively growing, so you never wait on a strain we don't have ready. If G2 shows as sold out, you can still order G1, prepared fresh for you from our liquid culture. Prefer to grow G1 yourself? Our Grain Spawn Kit lets you inoculate the bags in your own space. Running a farm and need G2 every week? Contact us to arrange regular weekly deliveries. The first shipment takes about 4–6 weeks to prepare.

Product Details:

Approximately 1.5 kg fully colonized premium corn grain spawn
Available as G2 from current production, or as made-to-order G1
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.

Cultivation Experience & Support:

This product is intended for experienced growers familiar with substrate preparation, inoculation, incubation, and fruiting. Purchase includes the grain spawn only and does not include personalized cultivation guidance or troubleshooting. Support is available for order-related concerns and issues covered by our Quality Guarantee.

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