Grain Spawn Rye 3 LB

Detailed Description: The 3 lb grain bags are designed for larger scale mushroom cultivation, offering the same high-quality features as our smaller grain bags. These bagsare ideal for more extensive growing operations, providing the perfect environment for mycelium growth. Suitable for typical monotubs ranging from 19 quarts to 60 quarts.

Features: Hermetically sealed grain, self-healing injection port, 0.2-micron filter patch for oxygen intake and contamination prevention, heavy-duty Unicorn brand bag for break and shake.

Ingredients: Rye


Usage Instructions:

In a sterile environment:
  1. Prepare a syringe with spores or liquid culture
  2. Sterilize the injection port with isopropyl alcohol
  3. Inject the spores or culture through the port.The self-healing port requires no tape

Tech Specs


Suitable for mono-tub technique/mid-scale mushroom cultivation


5”x4”x18” 3.0mil PP


3 lb

Filter Type:

0.2 Micron

What is this product used for?

This product is used as a nutritive substrate to grow out fungal mycelium.

The grain has been selected for its high food-grade quality, optimized to the perfect moisture, and sterilized and sealed to prevent any unwanted contamination before the selected fungus is introduced.

What are the main ingredients of this product?

We currently only use two types of grain:

  • Rye
  • Popcorn

How do I prepare the product for use?

  • Store the 3 LB Grain Bag in a cool, dry place until ready for use.
  • Gather your liquid culture or spore syringe and a sterile injection needle. 
  • Prepare a clean, smooth work area and sterilize all work surfaces with isopropyl alcohol.
  • Ensure that all fans have been turned off and all windows have been closed for at least twenty minutes to encourage a still air environment. The cleaner your environment, the higher your success of avoiding contamination will be.
  • A clean kitchen or bathroom are good examples of ideal environments for the amateur mycologist.

How Long Does It Take for Mycelium To Start Growing?

Mycelial growth is visible in 3-4 days for popcorn and 4-7 days for rye.

It takes 1-2 weeks to reach 30% colonization and an additional 1-2 weeks for full colonization after a break and shake.

Can I reuse this product after one cycle of growth?

While the bags, ports, and filters can be reused or repurposed if desired, it might be more cumbersome than just getting a new bag or unit.

How is the product packaged for shipping?

Bags are sealed in zipper plastic bags and placed in appropriately sized cardboard boxes. Packing paper ensures bags are secure and undamaged during shipping.

Shipping Info


Bags are placed in appropriately sized cardboard boxes. Packing paper ensures bags are secure and undamaged during shipping. Boxes are discrete with no company branding on the outside.


Typically a 15”x13”x10" box, varies with order quantity.


3 lb

  • Locations

    Colorado Cultures

    4011 S. Broadway Unit 104
    Englewood, CO 80113

    Colorado Cultures

    3890 Kipling St Unit K
    Wheat Ridge, CO 80033

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