King Oyster Mushroom Grain Spawn

King Oyster Mushroom Grain Spawn

Lead time: 2-10 Days (Business Days)
Incl. VATShipping calculated at checkout.

Select Growing Bag (+£5.99)

Master's Mix Pellets (Raw Mix)

Our Premium King Oyster Mushroom Grain Spawn is perfect for growing sumptuous, meaty, and intensely flavourful King Oyster Mushrooms (Pleurotus eryngii). Our strain is selectively bred to yield bountiful flushes of delectable mushrooms that offer a sensorial delight, rich in earthy aroma and savoury undertones.

Though King Oyster Mushrooms are often considered more advanced to cultivate than other oyster varieties, they excel in cooler climates and benefit from attentive humidity management, especially in early growth stages. These specific requirements make them perfect for cultivators seeking hands-on growing experience. Meeting these conditions will reward you with a unique taste and aroma that other mushroom types simply can't compete with.

  • Selectively bred for high yield and superior taste and aroma.
  • Optimised for cooler climates with specific humidity needs.
  • Resistant to bacterial infections for reliable cultivation.
  • Suitable for up to two flushes, with yields of 150-180g per kg of fresh substrate.
  • Thrives in a variety of hardwood substrates
Pleurotus eryngii
Inoculation Rate
Mix with ± 1% spawn
Recommended Substrate
75% hardwood, mixed fine + coarse; 10% cereals; 5% oil seeds; 10% bran; Humidity: 65-70%
Room temperature: 23-25 °C; Substrate temperature: 25-28 °C; Duration: 10-15 days
Primordia Induction
(Night time)* Temperature: lower to 18 °C;
Fruiting Conditions
Room temperature: 12-15 °C; Relative Humidity: 95-97%; CO2-concentration: < 1200 ppm; Light: 800-1500 lux
Number: 2; Interval: 1-2 weeks; Between flushes: relative humidity increase up to 90%
Total Production Cycle
Ca. 2 months
Average Yield
150 to 180 g saleable mushrooms per kg fresh substrate


Note: Please refer to the specific lead times shown on product pages for more accurate delivery times.

  1. Small Orders (E.g. 100ml Spawn, Plugs): Sent via Royal Mail large letters.
  2. Medium-Sized Orders (under 2kg): Royal Mail 24-48 hour tracked parcel.
  3. Large Orders (2kg+): via DPD Express.


  1. Standard Returns: Returns and exchanges within 14 days of receipt. The item must be unused and in its original packaging. See our returns policy here.

This does not apply to our Gift E-Cards, which are delivered via email.

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