I grew mushrooms an had no means of compiling materials for a casing (laziness) . So i went to Walmart an picked of some Organic Jiffy Seed Starting mix and without measuring i added distilled water to the material an microwaved for 10 minutes. let cool too room temperature an then applied to casing an covered my tray. within 7 days i uncovered my casing an to my surprise the mycelium colonized it. I waited 10 days an just spotted sight of pinning mushrooms. is this unheard of? it seems to be working fine... but if there are things i need to worry about the people of this forum should please cast forth their knowledge and let me know