4 lb 3-Grain All-In-One Mushroom Grow Bag

Unlock a higher-yield, all-in-one solution for gourmet and medicinal mushroom cultivation with our 3-Grain All-In-One Mushroom Grow Bag – 4 lb. Engineered for serious growers and compact production setups alike, this 4 lb bag combines a nutrient-rich three-grain foundation (rye berries, wheat berries and millet) with a fortified casing mix, eliminating the traditional steps of transferring spawn, mixing substrate and layering casing. Each bag is pre-sterilized, pre-hydrated, and ready to inoculate — no jars, no messy prep, no separate bulk substrate work.

At the base of the bag is the triple-grain blend: organic rye, wheat and millet grains cooked and hydrated to chef-level precision, delivering ideal moisture, density and nutrient profiles for vigorous mycelial colonization. Above this foundation sits a premium casing layer—rich in coco coir, vermiculite, gypsum and added nutrients—to retain moisture, support pin-set development and maximize flush potential. The union of grain spawn and casing mix in one sealed bag brings streamlined workflow, reduced contamination risk and faster time-to-fruit.

Each bag is equipped with a self-healing injection port and a 0.5-micron gas exchange filter patch, enabling easy inoculation and optimal airflow during colonization while minimizing contamination exposure. Simply inject your spore syringe or liquid culture, incubate until full colonization, then move into fruiting conditions to yield strong, healthy flushes of gourmet mushrooms.

Key Features & Benefits

• 4 lb All-In-One Format: Combines grain spawn + casing mix in one bag — large size supports higher yield potential.
• Triple-Grain Blend: Rye, wheat and millet create a diverse, nutrient-dense foundation for rapid colonization and mycelial strength.
• Pre-Loaded Casing Layer: Coco coir/vermiculite/gypsum mix provides moisture retention and supports robust fruiting.
• Sterile, Ready to Use: Each bag arrives sterilized, sealed and ready for inoculation — reduce setup time and complexity.
• Injection Port + Filter Patch: Enables clean inoculation and proper gas exchange for optimal colonization performance.
• Ideal for Gourmet & Medicinal Species: Whether you’re cultivating shiitake, oyster, lion’s mane, reishi or others, this substrate system delivers.
• Great for Home or Boutique Production: The 4 lb size is perfect for small-batch producers, chef-mycologists, or enthusiasts scaling up.

How to Use

1. Inoculate using 3-5 cc of spore syringe or liquid culture through the injection port.
2. Incubate the bag in a clean, dark environment at ~75-82 °F until the substrate is fully colonized—times vary by species and strain.
3. Once colonized, create fruiting conditions (fresh air exchange, humidity, light) to trigger pin set via the casing layer, and harvest when mature.
4. With proper care, expect multiple flushes—this all-in-one system supports sustained production.

The 3-Grain All-In-One Mushroom Grow Bag – 4 lb is built for growers who understand how grain cooking, moisture control, and substrate dynamics affect results. Whether you’re a professional chef-mycologist aiming for premium output, or a dedicated hobbyist ready to level up your cultivation game, this bag provides the foundation and convenience to deliver consistent, high-quality flushes while streamlining your workflow.

Grow smarter, faster, cleaner—choose this high-performance 4 lb all-in-one substrate bag and let your mycelium thrive.