Simple Ways to Store Mushroom Spawn: 7 Steps (with Pictures) (2024)

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Co-authored byAmber CrainReviewed byErin Hostetler

Last Updated: January 30, 2024

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   Leave the spawn in its original packaging. The original packaging is perfect for storage since it's designed to protect spawn and keep it fresh. Spawn packaging is usually a single plastic bag, but some spawn come double-bagged. If you see 2 plastic bags, remove the outer bag and just use the inner bag for storage.^[1]

   • If the manufacturer provides specific storage instructions, always follow their recommendations.
   • If you don’t have the original packaging, use a plastic sandwich baggie.
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   Squeeze all the air out of the bag. Gently roll the bag and press down on it. Do your best to squeeze all the air out of the bag before sealing it.^[2]

   • Don’t take the bag outside or to a different area after squeezing the air out. This introduces dirty air into the bag.

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   Tie the bag closed loosely so the spawn can breathe. Airtight storage isn't ideal for mushroom spawn since they need ventilation to survive. Instead of sealing the bag tightly, loosely tie the top ends together.^[3]

   • If the manufacture specifies an airtight container for their spawn, follow those directions.

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   Store spawn in a dark spot at room temperature if you’re using it in 1-2 days. If you know you're going to use the spawn within a couple of days, stash the bag in a dark spot at room temperature. Don't put the bag near any windows! Direct sunlight can damage or kill the spawn.^[4]

   • If you're not planning using the spawn within 2 days, refrigerate it.
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   Put spawn in a fridge set to 0–2°C (32–36°F) for long-term storage. Mushroom spawn stays fresh in cold temperatures. Make sure your refrigerator is set to 0–2°C (32–36°F) for ideal storage conditions. Then, place the bag of spawn inside the fridge.

   • If your refrigerator is full, leave 10cm (3.9in) of space around the bag for proper airflow.
   • Keep in mind that Pink Oyster and Almond Agaricus spawn can't be refrigerated. Store them in a dark spot at room temperature and use them within a month.
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   Open the refrigerator for about 1 minute each day to circulate air. Spawn need air circulation to stay healthy. Make sure sunlight isn't shining into your fridge when you prop open the door, though! Remember that direct sunlight can kill mushroom spawn.

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   Use the mushroom spawn within 2-4 months for the best results. Even in your fridge's ideal conditions, mushroom spawn won’t last forever. Spawn usually live for 2-4 months in cold storage. Be sure to use the spawn within that time so your mushrooms grow properly.^[5]

   • The sooner you use the spawn, the more likely it is to grow mushrooms successfully.
   • The exception is plug spawn, which can last 6 months in the refrigerator.
See Also
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