Premium Grain Bag for Mushroom Spawn (Spawn Bomb™)

Available Sizes

Choose the size that fits your grow:

• 1 lb Grain Bag

• 2 lb Grain Bag

Larger grain bags provide more inoculation points and allow you to expand into larger bulk substrates.

Why We Use Milo Instead of Oats

Most grain bags on the market are made with basic feed-store oats. While oats can work, they often include:

• Cracked grains

• Empty shells

• Inconsistent hydration

We’ve upgraded our Spawn Bomb™ grain bags to use premium Milo grain instead.

Benefits of Milo Grain:

• Smaller, more uniform grain size

• More surface area for mycelium to colonize

• Fewer burst grains and empty hulls

• Faster, more even colonization

This results in cleaner spawn and more consistent growth, especially when expanding to bulk substrates.

Sterilized, Hydrated & Ready to Use

Each Spawn Bomb™ grain bag is:

• Properly hydrated using a proven recipe

• Sterilized in commercial-grade autoclaves

• Designed to preserve nutrients without overcooking

• Made fresh and shipped quickly

The bag also features a 0.2-micron filter patch, allowing proper gas exchange while keeping contaminants out.

Simple to Use

1. Inject the grain bag with your preferred spore syringe

2. Store in a clean, warm area

3. Watch the mycelium colonize the grain

Once fully colonized, your spawn is ready to be mixed with bulk substrate.

That’s it — no complicated steps or extra equipment required.

Great for Beginners & Experienced Growers

Whether you’re:

• Growing mushroom spawn for the first time

• Scaling up your grows

• Looking for more reliable grain bags

The Spawn Bomb™ gives you a clean, dependable starting point.

Important Notes

• Spore syringe not included

• For microscopy and legal uses only

• Always follow local laws regarding mushroom spores