Sterilized Grain Bags – 3 lb Rye for Mushroom Cultivation

Description

Sterilized Rye Grain Bags for Edible Mushroom Cultivation

Prepare your own grain spawn without soaking, cooking, or sterilizing grain at home. Each bag contains 3 lb of hydrated rye grain supplemented with gypsum and is ready to inoculate with an edible mushroom liquid culture.

What’s Included

• 3 lb of prepared, sterilized rye grain
• Self-healing injection port for syringe inoculation
• Filter patch for gas exchange
• Alcohol wipe for cleaning the injection port

No mushroom culture is included. These bags are intended for preparing grain spawn, which can then be transferred to a suitable growing substrate.

How to Use

For a detailed walkthrough, follow our Grain Bag Instructions.

1. Inspect the bag. Before inoculation, check for unusual growth, excessive standing liquid, or damage to the bag, seal, injection port, or filter patch. Some condensation can be normal after temperature changes during shipping. Keep the bag sealed and contact us if anything appears wrong.
2. Prepare a clean workspace. Wash your hands and clean your work surface before starting. Work away from fans, open windows, and drafts, and give disturbed dust time to settle. A still air box or laminar flow hood can help reduce exposure to airborne contaminants.
3. Prepare the culture and injection port. Gently mix your edible mushroom liquid culture syringe to distribute the mycelium. Attach a new sterile needle without touching the needle or connection point. Wipe the injection port with the included alcohol wipe and let it dry completely.
4. Inoculate through the port. Slowly inject approximately 2–5 mL of liquid culture through the self-healing injection port, then carefully withdraw the needle. Keep the bag sealed and avoid adding excess liquid. Follow your culture supplier’s specific recommendations if they differ. Dispose of the needle in an appropriate sharps container.
5. Allow the culture to establish. Leave the bag undisturbed in a clean location. Do not mix the grain immediately after inoculation. Keep the filter patch unobstructed and avoid direct sunlight or strong heat sources. Normal indirect room light is fine. Follow the colonization temperature recommended for your mushroom species.
6. Break and shake at approximately 20–30% colonization. Keeping the bag sealed, gently break apart the colonized grain from outside the bag and mix it throughout the remaining grain. Redistribute the grain into an even layer, then return the bag to its colonization area. Avoid putting pressure on the filter patch or injection port. One break and shake is enough for most grows.
7. Allow the grain to finish colonizing. Leave the bag sealed while the mycelium spreads throughout the remaining grain. Visible growth may appear reduced immediately after mixing as the culture recovers. Colonization time and mycelium appearance vary by species, culture quality, and growing conditions.
8. Transfer to a suitable substrate. Once the grain is fully colonized and shows no signs of contamination, use it to inoculate a substrate appropriate for your edible mushroom species.

Signs of Possible Contamination

Unusual green, black, pink, or red growth, slimy grain, or increasing wetness accompanied by stalled growth can indicate contamination. Keep bags showing clear signs of contamination sealed and dispose of them. Avoid opening a contaminated bag indoors.

Storage Before Use

Store unopened bags in a cool, clean location away from direct sunlight and excessive heat. Keep the bag sealed until use, and protect the injection port and filter patch from damage.