Sterilized Grain Bag for Mushroom Spawn (3 lbs)

Sale price$18.99 Regular price$22.99
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Discover the Superior Choice for Mushroom Cultivation: Our Sterilized Millet Grain Bags

Elevate your mushroom cultivation with our meticulously prepared Sterilized Grain Bags. Specially designed for the dedicated mushroom cultivator, these bags offer an optimal substrate for mushroom spawn development.

Key Features and Benefits:

  • Premium Millet Grain Base: Our grain bags are filled with high-quality millet grain, known for its exceptional nutrient content and moisture retention, making it an ideal substrate for mushroom spawn.
  • Enhanced with Calcium Sulfate Dihydrate: To further enhance the substrate, we add Calcium Sulfate Dihydrate to the mix. This addition ensures a balanced pH level and provides essential minerals, contributing to healthier and more robust mushroom growth.
  • Sterilized for Purity: Safety and cleanliness are paramount in mushroom cultivation. That's why each grain bag undergoes a thorough sterilization process in our commercial autoclaves. This step eliminates contaminants, ensuring a pure and ready-to-use product.
  • Optimized for Mushroom Spawn: The composition of our grain bags is specifically tailored for mushroom spawn, promoting vigorous mycelial growth.

Ideal for All Types of Mushrooms: Whether you are growing gourmet mushrooms or experimenting with different varieties, our Sterilized Grain Bags provide a reliable and efficient starting point for your cultivation journey.

Easy to Use:

  • Simply inoculate with your preferred mushroom culture.
  • The bags are equipped with a self-healing injection port for easy and contamination-free inoculation.
  • A breathable filter patch allows for fresh air exchange while maintaining a sterile environment.

Why Choose Our Sterilized Grain Bags?:

  • Consistent Quality: Each batch of grain bags is prepared with the utmost care to ensure consistent quality.
  • Enhanced Growth Potential: Our unique blend of millet and gypsum provides a rich and nurturing environment for mushroom spawn.
  • Ready-to-Use Convenience: Pre-sterilized and ready for inoculation, our bags save you time and effort, letting you focus on the growth and harvest of your mushrooms.
Size: 3 LB

Customer Reviews

Based on 7 reviews
David Luciano

Good packing

Thom Morgan
Great Product

I love these grain bags! I inoculated my latest one on 3/25/24, with spores from inoculate the world, my trusted source, and have about 10% mycelium colonization. In about one week I will mix the bag and wait for full colonization before splitting it between two spawning bags. That’s right folks I get two grows out of one grain bag. I’m just an amateur grower so I don’t know if I’m doing it right but it seems to work well for me! I’ve had much better success with grain and spawn bags vs all in ones, but that’s just been my home mycologist experience. Highly recommend. Costumer services is amazing with these guys they will literally send you pictures to help you figure out what you’re doing. Top notch.

Bryan Murphy
Excellent Quality!

These guys are as professional as you can get! The product was perfect quality, and the customer service exceeded my expectations. Thank you Olympus!


The grain bag was a game-changer for my mushroom cultivation. Will definitely reorder in the future.

M. J.

Highly satisfied with my purchase. The sterilized millet grain bag was well-sealed and delivered in time. Appreciate the attention to detail in ensuring a contamination-free product.