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Sterilized Grain Combo Bag with Injection Port


Mushroom Growing Kit sterilized millet and rye injection port grain bags are the best of both worlds! Millet provides more surface area when compared to other grains and results in more mycelium growth (500ppm vs. 200ppm). Rye adds a kick of carbohydrates to fuel growth and improve colonization times.

  • 3 pound or 5 pound injection port bags
  • Sterilized in commercial autoclave
  • High quality certified organic grain

We recommend inoculating a 3 pound bag of millet and rye grain with 2.5 to 5cc of liquid culture and our 5 pound bags with 5 to 7.5 cc. For every pound of colonized grain you will require roughly 5 pounds of substrate for maximum yields.

Buy Mushroom Bulk Substrate & Save

Buy any mix of Mushroom Growing Kit Substrate Bags and receive the following discounts at checkout:

Buy 3 - 7
Buy 8 - 11
Buy 12+
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Mushroom cultivation is a delicate process that requires precise techniques and attention to detail. Transferring mushroom spawn to a substrate is a critical step in the process, and it’s important to follow the proper procedures to ensure the best possible outcome. Here are some instructions and tips for transferring mushroom spawn to substrate:

Materials needed:

  • Mushroom spawn
  • Sterilized substrate 
  • Sterilized tools (such as a scalpel, forceps, or spoon)
  • Sterilized container or bag for growing mushrooms
  • Alcohol spray or wipes for sterilizing tools and surfaces
  • Gloves and a face mask


  1. Prepare your work area: Make sure your work area is clean and free of any potential contaminants. Sterilize your tools, gloves, and work surface with alcohol spray or wipes.

  2. Sterilize the exterior of your substrate and spawn bag using alcohol. 

  3. Inoculate the substrate: Once your substrate is prepared, it’s time to inoculate it with the mushroom spawn. Using sterilized tools, transfer the spawn to the substrate. Depending on the type of spawn you’re using, you may need to break it up into smaller pieces before transferring it.

  4. Mix the spawn and substrate: After you’ve added the spawn to the substrate, mix it thoroughly to distribute the spawn evenly. This will help ensure that the mushrooms grow evenly throughout the substrate.

  5. Pack the substrate: Once the spawn and substrate are thoroughly mixed, pack the mixture into a sterilized container or bag. Make sure the container or bag is sealed to prevent any contaminants from entering.

  6. Incubate the container: After you’ve packed the substrate, it’s time to incubate it. This involves keeping it in a warm, dark place for a period of time to allow the mycelium to grow throughout the substrate. The specific incubation time will vary depending on the type of mushroom you’re growing and the temperature you’re keeping it at.

Tips for keeping tools and materials sterile:

  • Use gloves and a face mask to prevent any bacteria or fungi from spreading from your body to the materials.
  • Use alcohol to clean your tools and work surface before starting and periodically throughout the process.
  • Work in a clean, well-ventilated area to minimize the risk of contamination.
  • Only open your spawn and substrate containers when necessary and reseal them as quickly as possible.
  • Use a separate tool for each container to avoid cross-contamination.
  • Be sure to follow the specific instructions for sterilizing your substrate and tools to ensure that everything is properly cleaned.

Our substrates can be stored for several months in a dark room at room temperature. There is no need to refrigerate our substrates for storage.

All of our substrates are sterilized and filled in a lab environment. We take great precautions to ensure your products are viable upon arrival. However, some contamination can occur with shipping damage.

When you receive any of our products, it’s best practice to set them aside for 4 to 7 days before using. Inspect the product regularly for signs of contamination and if you notice something, we’ve got you covered! 

All of our products come with our sterile guarantee. If something gets lost or damaged during shipping, we’ll replace it at our expense. Just contact us.

Introducing our top-of-the-line sterilized grain bag with injection port, designed for the ultimate mushroom cultivation experience! This bag is filled with a blend of rye berries and millet grain, creating the perfect environment for mycelium spawn to thrive and grow.

Rye berries are known for their high protein and nutrient content, which makes them an ideal substrate for mycelium spawn. They provide a sturdy base for the mycelium to attach to and grow, and their high nutrient content promotes healthy and robust growth. Millet grain, on the other hand, is a fantastic source of carbohydrates, which are essential for the growth and development of mushrooms. Together, these two grains create a nutrient-rich environment that ensures the best possible growth for your mushroom crops.

Our injection port bag makes mushroom cultivation easier than ever before. The injection port allows for easy inoculation with your chosen strain of mycelium, eliminating the need for complicated and messy inoculation techniques. The bag is also incredibly durable and designed to withstand the rigors of the growing process, ensuring that your crops are protected throughout every stage of development.

In addition to their practical benefits, rye berries and millet grain also add a delicious nutty flavor to your mushrooms, making them a hit with chefs and foodies alike. The combination of these two grains ensures that your mushroom crops are not only healthy and nutritious but also incredibly tasty.

So why wait? Order your injection port bag today and start growing the best mushrooms you’ve ever tasted!

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