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  • 10cc King Blue Oyster liquid culture, a first-generation (G1) Blue x King Oyster hybrid
  • Thick, meaty flesh that sears and stir-fries without collapsing
  • Keeps up to 10 days refrigerated, far longer than most oysters
  • Colonizes grain in 12–16 days; fruits cool at 60–70°F
  • Includes a 16G 1.5" Luer Lock needle and alcohol prep pad; ships insulated
Retail: $19.99
Price: $12.50
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    Item #: KBO10
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    Our King Blue Oyster is a first-generation hybrid of Blue Oyster and King Oyster. It keeps the blue-gray caps and fast clustering of one parent and the thick, meaty flesh of the other, and it keeps after harvest far longer than any other oyster in the Myco Labs library.

    • Pleurotus hybridSpecies
    • G1Isolated genetics
    • 12–16 daysColonization
    • 60–70°FFruiting temp
    • BeginnerDifficulty

    Why grow our King Blue Oyster culture

    Up to 10-day shelf life

    Most oysters wilt in a day or two. King Blue holds up to ten days refrigerated, which matters for market growers and batch cooks.

    Meaty texture

    Dense enough to sear and stand in for meat, and firm enough to survive a stir-fry without collapsing.

    Easy to grow

    It behaves like a standard cool-weather oyster, fruiting at 60–70°F with no special technique.

    Inoculating with liquid culture

    1Warm and shake

    Let the syringe reach room temperature, then shake it gently to break up and spread the mycelium through the broth.

    2Sterilize

    Flame the needle until it glows, let it cool a few seconds, and wipe the injection port with the included alcohol pad.

    3Inject

    Use 2–3cc per quart jar or 3–5cc per 3–5 lb grain bag. One 10cc syringe inoculates about 2–4 containers.

    4Incubate

    Keep it at 70–75°F in the dark. Shake once at about 30% colonization to speed things up.

    Store it dry: keep harvested King Blues in a paper bag in the fridge, not sealed plastic. Trapped moisture is what shortens their shelf life.

    King Blue Oyster growing parameters

    SpecDetail
    Scientific namePleurotus hybrid (Blue Oyster x King Oyster)
    GeneticsFirst-generation (G1) isolated culture
    Recommended substratesHardwood sawdust, Master's Mix, straw, wood chips
    Incubation temperature70–75°F
    Incubation humidity85–90%
    Colonization time12–16 days on grain
    Fruiting temperature60–70°F
    Fruiting humidity90–93%
    Time to harvest14–21 days after fruiting conditions start
    Fresh air exchangeHigh, 4–6 exchanges per hour
    In the package10cc syringe, 16G 1.5" Luer Lock needle, alcohol prep pad
    StorageRefrigerate at 35–45°F; never freeze

    From our lab to your grainRun it into jars with wide-mouth cultivation lids or your own lids with self-healing injection ports. Spare 16G needles and sterile Luer Lock syringes are sold separately.

    Frequently asked questions

    How much liquid culture do I use per jar or bag?

    Use 2–3cc per quart grain jar and 3–5cc per 3–5 lb spawn bag. One 10cc King Blue Oyster syringe inoculates roughly two to four containers. Using more doesn't speed colonization much; it just uses up the syringe.

    How long does King Blue Oyster take to colonize grain?

    12–16 days at 70–75°F, a little slower than Blue Oyster. Shaking once at about 30% colonization helps.

    What's the best substrate for King Blue Oyster?

    Hardwood sawdust or Master's Mix gives the thickest, densest fruits, which is where this hybrid shines. Straw and wood chips work for a cheaper run, with thinner flesh.

    What is a King Blue Oyster?

    A hybrid of Blue Oyster and King Oyster. It keeps Blue Oyster's color and fast clusters and gains thicker, meatier flesh from the King side. It grows like a standard oyster.

    How should I store the syringe?

    Refrigerate it at 35–45°F in the bag it shipped in and never freeze it; freezing ruptures the cells and kills the culture. Bring it to room temperature and shake gently before you inject.

    Why liquid culture instead of a spore syringe?

    Liquid culture is living mycelium from an isolated culture, so it skips germination, colonizes days faster and gives genetically consistent fruits. Spores have to germinate and pair up first, which is slower and more variable from grow to grow.

    Packed to arrive alive

    Liquid culture is living mycelium, so every syringe leaves our lab in a foil-lined insulated mailer. The insulation buffers it against summer heat in a delivery truck and against sub-freezing winter temperatures, so it arrives viable either way.

    Myco Labs liquid culture syringe packed in a foil-lined insulated mailer

    When it arrives: refrigerate the syringe at 35–45°F until you're ready to inoculate. Never freeze it. Bring it to room temperature and shake gently before use.

    Overall Customer Rating of 2 Reviews:
    review-star review-star review-star review-star review-star
    Brussels WI

    Decent Genetics

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Super aggressive, quick growing. Super susceptible to blotch though.

    California

    Great!

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Amazing strain, grows fast, larger than regular Blue oyster and tastes better! Winner in my book!

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