Brown Oyster Mushroom
Grain Spawn

Pleurotus Ostreatus var.

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Brown Oyster Mushroom Grain Spawn - 2 kg

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.

Grain spawn contains a lot of energy for the mycelium to consume. It’s a bit like rocket fuel for mushrooms. It’ll take off like wildfire once added to your bulk substrate.

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. 

Next Batch Due For Dispatch 11th August

Available on backorder


Free Delivery With Every Order

Free standard delivery is included with every order. All deliveries are lodged via Australia Post.

Products listed available and in stock will be dispatched within 48 hours.

Flat rate express delivery is available with next day dispatch for any order placed before midnight 12 am.

Express post is recommended for placing interstate orders during the summer months to avoid delay and ensure freshness.

Back order – Any items on back order will be dispatched separately. Items on back order are anticipated to be fulfilled within 21 days unless stated otherwise.

What Are Brown
Oyster Mushrooms?

The brown oyster mushroom (pleurotus ostreatus var.) will produce large clusters of velvety, beige coloured caps. The thick, fast growing mycelium will produce fruits throughout most of the year with adequate protection from temperatures over 30 making it an ideal summer candidate for an indoor grow project. It will continue to fruit at temperatures as low as 12 degrees.

What Do Brown Oyster Mushrooms Taste Like?

The brown oyster mushroom has a velvety texture with a subtle, sweet earthy flavour that enhances its savoury counterparts. It that can be used in a wide range of recipes. Finely diced it can make a great addition to casseroles, or sliced and added to a stir-fry. Oyster mushrooms are suitable for crumbing to yield a softer texture resembling calamari.

What Substrate Does Brown Oyster Grow On?

Brown oyster mushrooms will grow on a wide range of materials including sugar cane mulch, straw, hardwood, paper and coffee grounds.

For beginners we recommend starting with straw or chopped sugar cane mulch. Supplementation can be added in the form of coffee grounds or bran but will increase the chances of contamination.

Brown oyster mushrooms are considered to be a side-fruiting mushroom compared to the king oyster or button mushroom which are top-fruiting mushroom

Buy 10 Grow Bags For $10

Save on filter patch grow bags when you spend over $45 on grain spawn or grow kits. 

Brown Oyster Mycelium Appearance

Brown oyster mushroom mycelium is incredibly vigorous. Initially it is finer in appearance and structure than white oyster.  

The maturing mycelium may produce small amounts of yellow liquid metabolites which are a normal byproduct.

Any primordia which has formed prematurely, or in-vitro can be removed prior to using the spawn as usual. 

Pink oyster grain spawn left to form primordia
Pink oyster grain spawn

Brown Oyster Spawn Run

Brown oyster mushrooms will colonise both grain spawn and substrates very quickly. Full colonisation can often expected within 7 – 10 days. Store between 20 – 28 degrees Celsius (65 – 85 F) for optimum colonisation speeds

Brown Oyster Pinning Conditions

Expose the fully colonised substrate to fresh air ad humidity to trigger the formation of primordia. 

Maintain humidity over 70%rh and temperatures between 12 – 28 degrees.

Brown Oyster Fruiting Conditions

Fruit brown oyster mushrooms between 12 – 28 degrees Celsius. However they will tolerate temperatures outside this range. Maintain humidity over 70% for best results. Harvest mushrooms before caps turn upwards and release spores.

Learn How To Make Grain Spawn

Experienced mushroom cultivators will often produce their own grain spawn to reduce the cost of growing mushrooms. Grain spawn can be produced in small batches without the need for purchasing expensive equipment. Learn more about making grain spawn in our guide.

Using A Humidifier

Humidity can be managed through a diligent misting and fanning regime, however the introduction of a humidifier and humidity controller can help automate the process and ensure consistency.

Adding a 6L humidifier and controller to a greenhouse with the addition of a USB fan is a quick and easy way to make a low cost fruiting chamber that delivers excellent results.

Making A Fruiting Chamber

Mushrooms require humidity to grow. We recommend using a mini-greenhouse. Spraying the inside walls of the greenhouse will help raise humidity. A cheap humidifier can used to automate the process.

It’s important to ensure that the grow kit has fresh air exchange. Mushrooms produce carbon dioxide and will grow long and leggy if they require more oxygen. 

Check the product pages for species specific requirements.

Alternatively you can build a Shotgun Fruiting Chamber (SGFC) from a few common items found easily in your local hardware store.

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.

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Frequently Asked Questions

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