I posted this on another thread, but these pictures show a japanese maple that was grown in the ground for a number of years, dug up last year, and with few feeder roots, was planted into an Anderson flat in 100% pure turface. In case folks don't know, an Anderson flat is approximately 15"x15"x5". You can see in the attached pictures taken this afternoon just how terrible the rootball is now a year later. I don't know, maybe I should have used Superthrive or humic acid?
For what it's worth, I repotted a juniper earlier this weekend that was in Boon's mix (actually prepared from a repotting workshop with Boon three years ago). I was a bit surprised to see that there was a hard, cement-like mix at the bottom of the pot that needed to be scraped off.