Redwood Mushroom Supply Sterilized Sorghum Grain Bag

RMS Sterilized Grain – Clean, Ready-to-Use Sorghum Spawn for Mycology

Our Sterilized Sorghum Grain is a fully hydrated, sterilized grain spawn bag prepared in a controlled lab environment for mushroom cultivators who value consistency and efficiency. Made with medium-sized sorghum grain, this substrate offers an ideal balance of inoculation points, moisture retention, and nutrient content, making it a great choice for a wide range of gourmet and medicinal species

Each bag is sterilized, sealed in a Sakato-brand grow bag with a 0.2 micron filter, and includes an injection port for easy inoculation with liquid culture—no need to open the bag until you’re ready to transfer.

Product Features

Why Choose RMS Sterilized Grain?

• High Performance Grain – Sorghum’s medium size offers a sweet spot between surface area, hydration, and nutrition for strong, rapid colonization.
• Injection Port Included – Allows for quick, sterile liquid culture inoculation without opening the bag.
• Hydrated & Sterilized – Prepped to the ideal moisture level and ready for inoculation.
• Reliable, Professional Packaging – Sterilized and sealed in Sakato grow bags with 0.2 micron filters for clean colonization with an outer bag for additional protection.
• Prepared in a Lab Environment – Packaged in front of multiple flow hoods in air-scrubbed rooms to support clean workflow and minimize contamination risk.

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Product Details

Why Sorghum? A Balanced Grain for Spawn Production

Sorghum offers the best of both worlds: more inoculation points than rye and better overall hydration and nutrient content than millet. Its medium grain size supports even colonization, consistent moisture levels, and reliable nutrient delivery, making it a go-to for growers working with liquid culture or agar.

Includes Injection Port for Liquid Culture

Each bag features a built-in self-healing injection port, allowing cultivators to inoculate with liquid culture directly—no need to open the bag. The 0.2 Micron filter prevents the incursion of contaminants while promoting airflow to feed your mycelium.

Lab-Prepared & Contaminant Free

RMS grain is prepared in a dedicated lab facility using industry-standard sterilization techniques. Bags are filled, sealed, and sterilized in front of multiple laminar flow hoods within air-scrubbed rooms to help reduce contamination risks and improve consistency across batches.

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Specifications

• Ingredients: Sorghum, Gypsum
• Bag Type: Sakato Polypropylene Bag with 0.2 Micron Filter
• Weight: Approximately 3 Pounds

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Usage

Liquid Culture

Inject 2-5mL liquid culture into injection port using sterilized needle and syringe

Transfers

In a clean environment, or in front of flow hood, carefully cut bag open and add grain or agar wedge. Reseal bag and mix to incorporate.

Incubate until fully colonized, then proceed with bulk substrate transfer

Storage Recommendations

Store unopened bags in a cool, dry place, away from direct sunlight. Use promptly for best results and to maintain quality