King Oyster Spawn


The King Oyster – Pleurotus eryngii King Trumpet, King Brown, Trumpet Royale.. or whatever other hilarious name you know it by is the largest species of the Oyster mushroom family with a very thick, meaty stem.

450g of fully colonised rye grain within a filtered MycoTub – taken directly from King Oyster mother spawn to guarantee strong, healthy growth.



All of our spawn transfers take place in our ISO Class 5 Cleanroom and are immediately sealed in a breathable SteriBag.

You can choose to fruit right away from the MycoTub, or do some grain to grain transfers to bulk out your grow!
The MycoTub is filled at around ⅔ to allow for enough room to shake and break up the colonised grains, if required.

We have some sterile rye grain products suitable for transfers – the same MycoTubs that your spawn will arrive in can be found here and we also have the option of 500g or 1kg MycoBags here

You can also use some of the spawn on agar or in liquid culture.. it opens up a lot of fun options!

A 2 week production time is required on this product.
Depending on stocks, we may be able to dispatch sooner.

Unfortunately, we cannot ship this product outside of the United Kingdom right now due to some pre-Brexit requirements on live mycelium. Please only order this product if delivery will be within the UK.



Oyster mushrooms are not only delicious, but also provide the human body with many nutrients and minerals. They are rich in proteins, amino acids – which help to enhance memory and mental development – iron, niacin – which helps to maintain a healthy heart and lower cholesterol – fiber, B Vitamins and Vitamin D.

Lots of us are lacking in Vitamin D due to many hours indoors with no sun exposure, so these are a great way to boost your levels! Vitamin D positively influences cell growth and enzymes in our immune systems and our bodies also cannot absorb an important mineral, calcium, without a source of Vitamin D.

Many believe Oyster mushrooms to be the easiest to cultivate. They are primary saprophytes, which means they do not require a composted substrate. They will flourish on dead wood, straw, grass, wheat, rye, rice, corn, bamboo, cotton, hemp, coffee waste… practically any dried cellulosic plant material!

For more info on the health benefits of this species, read here.

You will also find lots of recipes for using this tasty mushroom with a quick search online!

Ask a question (1)

  1. Q What is the approximate yield in grams I can expect from this spawn?... Read more answer now
    Asked on 20th February 2021 10:34 am

    Well because it's spawn, you can expand it as much as you you want using grain to grain inoculation. You can also grow direct from this spawn as if it's a substrate and get many hundreds of grams of mushrooms or you can spawn it to a proper substrate choice such as sawdust and grow kilos. Really it's up to you how big you want to go with this spawn :)

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