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Our compost based substrate is fully pasteurized and ready to go. Featuring, coco coir, vermiculite, compost blend(aged horse manure and worm castings), gypsum, oyster shell, and beneficial selected microbes! Coming in a four pound by weight sealed bag, ready to inoculate with your favorite culture. Recommended fruiting method add one pound of grain spawn, reseal, and grow out in bag.

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