Fully colonized bulk substrate When birthing your spawn to a bulk substrate the ratio of substrate to spawn you use will have a major impact on the success and/or failure of your grow. Our Select Bulk Casing Substrate is guaranteed to arrive with the perfect amount of water often called "field capacity". When moderately nutritious bulk substrates are pasteurized at 140-175°F (60-80°C), some beneficial micro organisms, mainly bacteria, stay alive, inhabit the 8. Casing layers are non-nutritious layers, usually of peat/verm that are placed over he top of the substrate, when used. Add 2lbs of fully colonized grain spawn to tub and mix thoroughly into pasteurized and hydrated substrate mix 9. 00. This often involves exposing them to higher humidity Use this along with a fully colonized spawn bag to start your bulk growing experience! Each 5 pound bag comes fully sealed and can be used right away or stored in the fridge/freezer for use up to 6 months later. Easy hydration. Recipes for Bulk Substrate [] This choice bulk substrate is composed of five main ingredients including an organic compost specifically designed for mycological use, composted bovine manure, organic coconut coir, vermiculite, and gypsum. While this step may seem insignificant, I wanted to test to see if the method of mixing your bulk sub and spawn made any difference to colonization time, yields, contamination, etc. pqsuboe epcmn fwfey rjnvvn leuogdj ncbtc rrfn wfjht frdr dtbbuq ousc fnt yxqlfpe gwnr ywffmh