I've searched for info on mushroom compost and most was referring to large mushroom farms. I grow mushrooms and use coco and coffee ground. The grain I use is popcorn on some grows and rye on the others. I have 2 shoebox totes that I have gotten 1 flush from and was wondering if I can break up and add to my soil. The soil is just happy frog with perlite added. Any other personal mushroom growers do this?