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This All in One  Grow Bag weighs 3.5 lbs. APPROXIMATELY and is equal to 3.5 quarts in substrate. For your convenience the all in one manure based mushroom grow bag will simplify the gourmet mushroom cultivation process. This all in one grow bag is layered with substrates WHOLE OAT BERRIES, BOVINE MANURE, CHICKEN MANURE, PERLITE, VERMICULITE, HAY, WORM CASTINGS and GYPSUM. There is no need to transfer substrates to different bags or trays thus reducing the chance of contamination.  All dung loving gourmet mushroom species GROW FAST in this fully hydrated bag. Sterilized with a five-micron filter patch and self-healing injection port. Simply inoculate the berry layer of the substrate with 2-5 cc of your favorite gourmet mushroom inoculation solution. You must provide your own gourmet mushroom culture as none is provided. This sale is for a bag of sterilized substrate only. After inoculation allow your all in one bag to colonize in room temps for 4-6 weeks until your first flush of mushrooms. Mixing these heavy duty plastic bags once after 50% colonization is optional and can decrease colonization times. These bags hold 3.5 pounds of substrate (about 3.5 quarts of substrate). Instructions are included. This mushroom grow bag is great for BOTH novice beginners and professionals!  Mycology Grow Kit Spawn Bag Pasteurized

** Important **contamination during inoculation is a significant challenge in mushroom cultivation. Contamination during inoculation is by far the reason. Poor sterilization, using contaminated spores or mycelium, contaminated working environment, inadequate cleaning of hands or tools, and opening the inoculation container in an unclean environment. All our bags / jars are heated to 15psi 90 min in a Autoclave to ensure the customer has a clean start.. Feedback extortion will not work just return. If for any reason our customers are unsatisfied We Guarantee your money back.