Sterilized Fast Fruiting Mushroom Substrate (Master’s Mix)

    $18.50
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    RMS Fast Fruiting Mix – Sterilized Substrate for Gourmet Mushroom Cultivation

    The RMS Fast Fruiting Mix (Master's Mix) is a ready-to-use, sterilized substrate made for cultivating fast-fruiting gourmet mushrooms like oyster and lion’s mane. Formulated with a trusted 50/50 blend of red oak and soy hulls - commonly known as Master's Mix, this mix delivers the nutrition, hydration, and structure needed to support rapid colonization and high-yield flushes.

    Hydrated to field capacity and sealed in Unicorn-brand grow bags with 0.2 micron filters, this substrate is ideal for growers looking to grow gourmet mushrooms in the bag or in grow tents. 

    Also known as Master’s Mix, this substrate is a go-to choice for growers looking for fast colonization and consistent results with wood-loving species.

    Why Choose RMS Fast Fruiting Mix?

    🌾 Classic 50/50 Master's Mix Formula – A proven blend of red oak and soy hulls to support fast, vigorous growth.

    🍄 Designed for Fast-Fruiting Species – Perfect for oyster, lion’s mane, and other aggressive fruiters.

    💦 Hydrated to Field Capacity – Ready to inoculate—no soaking or mixing required.

    📦 Packaged for Performance – Sterilized and sealed in Unicorn 3T grow bags with 0.2 micron filters for clean colonization.

    🧪 Suitable for Commercial Production – Can be used in the production of gourmet mushrooms for sale, though the substrate itself is not certified organic.

    Ingredients: Red Oak, Organic Soy Hull

    Bag Type: Unicorn 3T Polypropylene Bag with 0.2 Micron Filter

    Weight: Approximately 5 Pounds

    Product Details

    Trusted Master’s Mix Formula

    This substrate follows the traditional 1:1 ratio of hardwood and soy hulls ration know as Master's Mix—a widely used formulation among commercial and home growers alike. The combination offers both slow-burning structure and fast-access nutrition, ideal for aggressive fruiting species.

    Fully Hydrated & Sterilized

    Hydrated to field capacity and professionally sterilized, this mix requires no prep or modification before use. Just add grain spawn, seal, and incubate—it’s cultivation-ready out of the bag.

    Packaged in Unicorn 3T Grow Bags with 0.2 Micron Filters

    Each batch is sealed in a Unicorn-brand polypropylene bag featuring a 0.2 micron filter patch for optimal gas exchange and contamination resistance. The bags are durable, autoclavable, and designed for in-bag fruiting.

    Instructions

    How to Grow Gourmet Mushrooms with Fast Fruiting Mix

    For In-Bag Fruiting:

    Add at least 10% fully colonized grain spawn by weight in clean conditions. Reseal the bag and mix thoroughly to ensure even distribution. Once fully colonized, cut slits or open the bag to initiate fruiting.

    Storage Recommendations:

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

    Specifications
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    Sterilized Fast Fruiting Mushroom Substrate (Master’s Mix)

    $18.50