Mushroom spawn is a substance that has been treated with mycelium to grow mushroom. Mycelium is a collection of cells that resemble a thread. Here’s a better description. Mycelium is what an apple tree is to an apple. It is the base for growing mushrooms.
You can use this spawn to move mycelium to any substance (substrate) if you want to grow mushrooms. You can utilize different substrates like logs, cardboard, straw, wood chips, and others.
The next question you want to ask yourself is if you can grow mushrooms from spawn without transferring to substrates. Well, you can, but it’s not the best approach. Some specific quantity of spawn can inoculate a higher amount of substrate. This can generate you more mushrooms compared to if you utilized spawn alone.
I provide everything you need to know about spawn in this article. But, I will quickly explain the different types of spawn and then recommend which type is considered suitable. Then, I will wrap it up with how to acquire and keep it.
Here we go!
Types of Mushroom Spawn
Spawn is any material treated with mycelium to vegetate mushrooms.
Sawdust Spawn
People use sterilized sawdust and then treat it with mycelium using grain spawn. The sawdust is composed of different types of hardwood with different sizes and textures.
You can use sawdust spawn to inoculate mushroom beds, logs, cardboard, pasteurized straw, and different types of substrates. You can also use it to treat wooden dowels if you intend creating a plug spawn.
One notable advantage of this type of spawn is the particle sizes. Because of their size and quantity, you can derive many inoculation points that can ensure mycelium penetrates the substrate. This increases mycelium colonization and allocates little or no time for contaminants to infiltrate.
A side effect is that, solely, it is not nutritious and may not produce your expected yield. Therefore, you may experience setbacks if you attempt growing your mushrooms from only sawdust. So how do you increase yield if you decide to use sawdust spawn? It’s simple! You can enrich the sawdust with bran or utilize another nitrogen source to improve your yields.
Grain Spawn
Grain spawn can be defined as sterilized grain treated with spores or sterilized mycelium solution. Several forms of grain can be employed with millet and rye being the common types that are used. Other options include wheat, corn, and other cereal grains. Guess what! You can even try popcorn.
You can also utilize grain spawn to create more grain spawn, sawdust spawn, or treat different types of pasteurized substrates like straw.
The bottom line for using grain is that it has more nutrients compared to sawdust. This makes it suitable for growing mushrooms indoors or creating more spawn. Meanwhile, I would not recommend it for treating outdoor beds. Birds and rodents can easily target delicious grains, thus leading to a waste of effort.
Plug/ Dowel
These are small wooden dowels that have been treated with mycelium. You can use sawdust or the stems of live mushrooms.
A major benefit of plug spawn is its effectiveness in inoculating substrates derived from fibers or woods. It can readily colonize wood chips, cardboard, paper, logs, or stumps. Meanwhile, it is not an ideal choice for grain or straw-based substrates.
Other Forms of Mushroom Spawn
Straw spawn: This straw is pasteurized and treated with mycelium.
Sawdust spawn plugs: It takes the shape of a plug having Styrofoam at the tail end.
Woodchip spawn: It is derived from woodchip of different hardwoods.
Liquid Spawn: Water treated with mycelia slurry/mushroom spores.
So which of the spawn mentioned above is the best?
The Most Effective Mushroom Spawn
To answer your question of which spawn to go for, my answer will be to consider what kind of mushroom you are growing. The purpose should determine which type you should opt for.
Notwithstanding, ensure you match your spawn to the substrate. For instance, if you intend to grow mushrooms on logs, I would recommend you use sawdust or plugs. The rationale is that the mycelium can acclimatize with this substance, thus impacting the colonization time.
Some mushrooms perform better on some specific substrates. You will need to research the forms of mushrooms you intend growing to know the suitable substrate.
Here are the most effective substrates suitable specific spawn
The listed examples should not be considered as a rule, but a recommendation. Therefore, be flexible when making your choices.
Sawdust: Wood chip beds, logs, cardboard, enriched sawdust, and non-pasteurized (outdoor) beds.
Grain: Enriched sawdust and pasteurized straw used in an indoor bed.
Plug/Dowel: Wood chips and logs.
A little bit of research before you can commence can save you a lot of stress in the end. You can start with something easier to enable you to appreciate the life cycle.
How do you acquire and store Mushroom Spawn?
You can buy mushroom spawn from different producers either offline or over the internet. Research for reputable producers so you can get the best quality. Spawn varies when it comes to quality.
You should have the inoculation date inscribed on your purchase. Take note of this date as it may degrade due to bacteria, mold, or waste products. It is a ‘use or lose’ product, so its lifespan is limited to an average of 2 months.
Endeavor to use it as soon as you purchase it. Otherwise, you can refrigerate to extend its lifespan. But don’t forget that time is not on your side, so open that spawn and use it as soon as possible.
Meanwhile, purchasing is just for the occasional mushroom farmer, for those who want to own a big mushroom farm or produce at a commercial quantity, it may not be ideal to purchase. The best option is to make your mushroom spawn. It’s not complicated; you only require more sterile methods.
Conclusion
Mushroom spawning should be a sterile operation when growing mushrooms. Ensure you thoroughly clean your spawning tools, equipment, baskets, and other tools with a stream of water and disinfectants. Ensure your garments; shoes are free of contaminants.
Nick
Nick is the author of ‘Hydroponics for Beginners‘ and ‘How to Grow Microgreens‘.
Nick writes content on his website about hydroponics and microgreens. So you can enjoy growing plants yourself!
Insights, advice, suggestions, feedback and comments from experts
About Mushroom Spawn and Mycelium
Mushroom spawn is a substance treated with mycelium, which is a collection of cells resembling a thread and serves as the base for growing mushrooms. Mycelium is essential for the growth of mushrooms, similar to how an apple tree is essential for growing apples. The spawn can be used to transfer mycelium to various substrates such as logs, cardboard, straw, wood chips, and others. While it is possible to grow mushrooms from spawn alone, it is not the most effective approach. Using a specific quantity of spawn to inoculate a larger amount of substrate can generate more mushrooms compared to using spawn alone.
Types of Mushroom Spawn
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Sawdust Spawn: This type of spawn is made by treating sterilized sawdust with mycelium using grain spawn. It can be used to inoculate mushroom beds, logs, cardboard, pasteurized straw, and different types of substrates. Sawdust spawn is advantageous due to its particle sizes, which provide numerous inoculation points for mycelium penetration. However, it may not be as nutritious and may not produce the expected yield when used alone. Enriching the sawdust with bran or utilizing another nitrogen source can improve yields.
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Grain Spawn: Grain spawn is sterilized grain treated with spores or a sterilized mycelium solution. It is more nutritious compared to sawdust spawn, making it suitable for growing mushrooms indoors or creating more spawn. However, it is not recommended for treating outdoor beds due to the risk of attracting birds and rodents.
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Plug/Dowel: These are small wooden dowels treated with mycelium, suitable for inoculating substrates derived from fibers or woods such as wood chips, cardboard, paper, logs, or stumps.
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Other Forms of Mushroom Spawn: Other types include straw spawn, sawdust spawn plugs, woodchip spawn, and liquid spawn.
Most Effective Mushroom Spawn and Substrates
The most effective spawn to use depends on the type of mushroom being grown and should be matched to the substrate. For example, sawdust or plugs are recommended for growing mushrooms on logs, as the mycelium can acclimatize with this substrate, impacting the colonization time. Different mushrooms perform better on specific substrates, so it's important to research the types of mushrooms intended for growing to determine the suitable substrate.
Acquiring and Storing Mushroom Spawn
Mushroom spawn can be purchased from reputable producers either offline or over the internet. It's important to ensure the quality of the spawn and take note of the inoculation date, as its lifespan is limited. For those interested in owning a large mushroom farm or producing at a commercial quantity, making mushroom spawn is a viable option and requires sterile methods.
In conclusion, growing mushrooms from spawn should be a sterile operation, and thorough cleanliness of spawning tools, equipment, and other tools is essential for successful mushroom cultivation.
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