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Shiitake Mushroom Grain Spawn

Strain: Lentinula edodes

From £15.99 Inc. VAT

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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 09/05/23 – 7pm + £9.00
    Seminar 11/04/23 – 7pm + £9.00
    Seminar 13/06/2023 – 7pm + £9.00

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Product Overview

Product Overview

Prized worldwide for its rich flavour and versatile abilities in the kitchen, our shiitake grain spawn will get you growing in no time. Using grain spawn is a higher intensity route to growing shiitakes but promises a speedier harvest. 

When growing Shiitake mushrooms with grain spawn, it is essential you sterilise your substrate beforehand. All our spawn boasts a very low generational count. The lower the generation of the spawn, the nearer to the original spore sample, so at only the fourth generation, Urban Farm-It can promise you the best. It is also double tested and axenic, meaning you are guaranteed a crop of shiitake and shiitake alone. 

  • Speedy way to grow shiitake
  • Suitable for returning customers/avid urban growers
  • Capable of producing up to three flushes
  • Naturally rich in Vitamin D

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Product Description

Product Description

Shiitake mycelium is unusual, in that it develops brown mycelia as compared to the usual fine white mycelium networks you may see when growing other mushrooms. Very often it can be mistaken for mould or rot. Shiitake offers a new experience with mushroom growing, and we at Urban Farm-It offer fast and responsive in depth customer service to make sure you get the most out of your grow. 

All of our spawn is stored in specialist breathable Microsac bags. This means that the spawn is always at its freshest, from our fridges to yours.

For larger quantities, check out our wholesale collection. 

More Information

Growing Time: 2-4 months

Cultivation Info


Binomial nomenclatureLentinula edodes
Old nomenclatureNone
Inoculation ratemix with ± 1% spawn
Natural substratecomposition:80% hardwood, mixed fine + coarse
10% cereals
10% bran
humidity:62-63 %
Incubationroom temperature:20-22 °C
substrate temperature:23 °C
duration:13-15 days
Primordia induction(night time)* temperature:
relative humidity:
Fruiting conditionsroom temperature:14-16 °C
relative humidity:88-93 %
CO2-concentration:400-600 ppm
light:500-1000 lux
interval:10 à 12 days
between flushes:temperature increase up to 19-24 °C, CO2 up to 1500-2500 ppm, humidity down to 85%
bud induction:immerse or irrigate substrate for 12 hours
Total production cycle
Average yield200 g to 300 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: the 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

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

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