What Is Grain Spawn?

Grow Mushrooms From Grain Spawn

Free Shipping On All Orders

What Is Grain Spawn?

Grain spawn is a little known secret weapon of the world of mushroom cultivation.

It’s made from sterilised grains that have been inoculated with a live mycelium culture. These inoculated grains are consumed by the growing mass of mycelium. 

The fully colonised grain spawn can be used as a starter culture for growing mushrooms. These grains are sometimes referred to as mushroom seeds due to their appearance and application.


Why Use Grain Spawn?

Grain spawn contains a lot of energy for the mycelium to consume. It’s a bit like rocket fuel for mushrooms. Once it’s added to your substrate it takes off like wild fire. 

Mother Nature works her magic using spores but in a controlled environment you need to tip the scales in your favour by using clean high-quality grain spawn so you are doing your best to ensure success.

Grain spawn is incorporated into a bulk substrate which is subsequently colonised by the mycelium culture. Once ready it will begin to convert the energy from within the bulk substrate into mushrooms.

A wide range of materials can be used as a bulk substrate for growing mushrooms. These include mulch, straw, paper, coffee grounds, hardwood sawdust and more.

Learn more about the differences between different bulk substrates for growing mushrooms in our guide to substrates.

What Is Paper Spawn

Some vigorous species of mushroom such as the oyster mushroom will colonise paper pellets with ease. Paper pellets are very low in nutrition which means that they can be colonised with minimal risk of developing contamination. The clean nature of paper pellets make them an ideal substrate for making your own spawn. On it’s own paper won’t yield many fresh mushrooms if allowed to fruit, however it makes for a handy, low-tech grain spawn replacement.

It’s important to note that paper spawn doesn’t possess the same vigour as grain spawn.

Make Your Own Grain Spawn

Eventually any budding mycological fanatic will want to try their hand at making grain spawn. Learning to make grain spawn at home is a valuable experience. Learn more about mushroom spawn and how it’s made with our step by step guide.

Make Reusable Spawn Jars

Modified jars are used to produce mushroom grain spawn. The lids on glass jars are modified to allow for gas exchange during both the sterilisation process and incubation period.

Personal taste and frequency of use will influence the methods employed to modify the jars. Jars can also be fitted with an injection port to facilitate the use of liquid culture with minimal risk of contamination.

Grain Spawn & Liquid Culture Jars

Using A Humidifier

Keeping mushrooms humid is key to ensuring consistent yields. A humidifier will ensure that the fruiting chamber has ample humidity to ensure consistently impressive yields. Learn more about maintaining humidity in our online guide.

Grow Oyster Mushrooms In Buckets

Most varieties of oyster mushroom – excluding the king oyster – love growing in buckets. Learn how we grow side-fruiting oyster mushrooms like the pink, blue, white or brown oyster using buckets & sugar cane mulch.

View Our Series Of Grow Guides

Who We Are

We’re a small scale producer of gourmet mushroom grain spawn and ready to grow kits located in South East Queensland. We’re passionate about fungi and we love sharing our obsession with the world.

Follow Us

Follow us on social media for updates on sales, new products and new tutorials.

Frequently Asked Questions

Do you have questions for us? We might have answered your question in our Frequently Asked Questions.