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King Oyster Mushroom Grain Spawn

Strain: Pleurotus Eryngii

From £8.75

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1 hour Q+A Webinar add on

Boost your kit or spawn purchase by booking a spot on one of our Q+A webinars, hosted by our mushroom growing course tutor Scribe! Covering aspects of hobbyist mushroom growing, this extra experience is sure to add special value to a gift for yourself or a loved one! By purchasing any kit or hobbyist spawn product you are automatically getting 50% off a spot in the webinar!

  • Seminars *

    Seminar 13/06/2023 – 7pm + £9.00
    Seminar 08/08/23 – 7pm + £9.00
    Seminar 12/09/23 – 7pm + £9.00
    Seminar 12/12/23 – 7pm + £9.00

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Product Overview

This King Oyster Mushroom spawn pack contains high quality, fresh living mushroom grain spawn ready for inoculation at home. 

Using our spawn, it is extremely easy to grow mushrooms all the way to fruit or use it to start your own mother culture.

Our strains are specifically selected for their high yield, vibrant colours and strong flavours. Boasting an incredibly low generation number, this laboratory-grade grain spawn can’t be matched in terms of quality and reliability.

  • First harvest in as little as 3 weeks
  • Suitable for returning customers/avid urban growers
  • Capable of producing up to 5 big harvests

Please read below for more species information, specifications and video.

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Product Description

The King oyster mushroom is largest of the oyster mushroom genus. They have a meaty texture and are known for their umami (pleasant savoury taste) flavour.

These mushrooms are commonly used in Japanese, Korean and Chinese cuisine – although this mushroom is native to the Mediterranean.

With a texture some a liken to scallops, these mushrooms are sometimes called ‘mushroom steaks’ or ‘vegan scallops’.

Our spawn is stored in optimum conditions using specialist breathable bags. This means that the organism is always at its healthiest and ready for inoculation.

For larger quantities check out out wholesale collection.

  • The ideal growing conditions for king oyster mushrooms are: 12-15 C
  • We recommend a storage temperature of no higher than 5 C for 7-10 days
  • First harvest: 3-5 weeks
  • Strain:  Pleurotus Eryngii

Commonly used substrates:

  • Chopped straw mixed  with coffee grounds
  • Hardwood logs and chips

Cultivation Info


Binomial nomenclaturePleurotus eryngii
Old nomenclatureNone
Inoculation ratemix with ± 1% spawn
Natural substratecomposition:75% hardwood, mixed fine + course
10% cereals
5% oil seeds
10% bran
humidity:65-70 %
Incubationroom temperature:23-25 °C
substrate temperature:25-28 °C
duration:10-15 days
Primordia induction(night time)* temperature:lower to 18 °C
relative humidity:
Fruiting conditionsroom temperature:12-15 °C
relative humidity:95-97%
CO2-concentration:< 1200 ppm
light:800- 1500 lux
interval:1-2 weeks
between flushes:relative humidity increase to 90%
Total production cycleca. 2 months
Average yield150 to 180 g saleable mushrooms per kg fresh substrate†

*Primordia are induced by a shock. For most mushroom species, this is done with a thermal shock, which is defined by the minimum temperature during the day-night cycle.

†Mushroom weight immediately after harvesting, and wetted substrate weight prior to inoculation.

Important remark: these cultivation guidelines in our technical data sheets are a compilation of the data given to us by experienced cultivators. Individual differences in the cultivation conditions can seriously affect the results.

Additional information

Weight0.075 kg
Package Size

100ml (approx.60g), 1L (approx.600g), 5L (approx.3kg)

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Hand holding home grown mushrooms child holding mushroom grow kit

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