Again, lots of videos on You-Tube about mycro. Again, primarily Pot growers. Know doubt these guys are cutting edge growers. After seeing one video about creating your own mycro with worm castings I tried it at home in a small plastic tub. I tried with worm castings, straight soil from my garden, in warm conditions and at room temperatures. My conclusions? The soil from the garden worked best and at room temperature. BTW I used crushed oats for a medium. I stopped putting mycro under the nodes after that. I did try spreading oats in the soil to and have new rooting grow into active mycro cultures but it just tends to clump up.
Not to step on anyone's toes here but I think adding mycro into your potting mixture, which tends to be sterilized, is the best use of this product. After that, it's entirely depends on your soil conditions. I know a lot of our Southern members have to chemically nuke their soil due to soil pathogens and I really think they have to add mycro. I suggest everyone do what I did and test there soil using crushed oats this fall. It's a real eye opener. I'll still buy mycro for my seedlings but that's it.