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Outdoor Oyster Mushroom Kit Instructions

Blue oyster is a fast growing mushroom that is fascinating to watch grow. It's well suited to a wide range of growing conditions making it perform well in colder conditions. This and the fact that its mycelium is quite vigorous makes it a good choice for outdoor growing. Grown outdoors, blue oyster mushrooms become quite dark in colour and are packed with vitamin D absorbed from the sun. It's a choice edible mushroom that is great in a wide range of dishes and our top recommendation for first time mushroom growers. This kit requires that you use extra growing medium to increase the size of your harvest.

Each species of mushroom is a different growing experience. Even if you have grown mushrooms before, please read the instructions for your kit carefully before proceeding. If you run into any problems please see our FAQ.

Outdoor Oyster Mushroom Growing Kit
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Step 1: Mycelium Check

Inside of this box, mycelium has has been happily breaking down organic substrates and converting it into energy. At first the mycelium is often wispy and hard to see, but as it gets ready to produce mushrooms it becomes more dense and white in colour. 


Open the box and remove the bag of oyster mushroom mycelium. DO NOT OPEN THE BAG but instead inspect the block through the bag to determine what stage the mycelium is at.

What colour is it?


Brown or mostly brown =

needs more time in a warm location

Mostly white =

ready to move on to stage 2

White =

ready to move on to stage  2

If your mycelium needs more time to develop, return it to the box and place it in a warm location - over 15°C and NO MORE THAN 25°C. Check it once a week until you see dense or fluffy white mycelium. 

If you are not ready to move on to step 2 but your block is, you can store it in the fridge for up to a month.

Step 2: Finding an Ideal Location

Oyster mushrooms grow best outdoors in moist soil that is out of direct sunlight and shielded from the wind.

  • Find a spot in your garden/allotment or place your planter that's shady and shielded. 

  • If you cannot find a spot with enough shade, you may use a tarp to act as a sun and wind shield. 

  • It's worth bearing in mind that slugs and other creatures enjoy mushrooms as mush as you do. Slugs can be a particular problem when the weather is very wet. You can try surrounding your chosen location with a layer of diatomaceous earth. 

Step 3: Preparing your Growing Medium

In nature, oyster mushrooms break down things such as dead trees and leaves. We can imitate this process by using commonly found organic materials such as sawdust, straw and cardboard as additional growing medium to increase the yield of your kit.


  • Use ripped up cardboard, straw and/or sawdust as additional growing medium for the mycelium to consume. You can use up to 2 times the weight of your mycelium block (1.8kg) in additional organic materials.

  • The cardboard box and tape used to package your kit is completely biodegradable, so that's usually a good place to start!

  • Gather your additional growing medium in a large bucket. Cover with water and leave to soak for 12 hours. Drain off any excess water.

  • You will also need to collect some pieces