Bonsai Empire has a new video out titled “Repotting a Spruce Bonsai on a slab” which features Internation Bonsai Master Walter Pall and two friends re-potting a vary large Spruce tree from a normal Bonsai pot onto a man made slab by American Jan Culek. Take notice of the way the tree is wired onto the slab. It looks like none of the roots were touched during the process. Another thing to think about is that it looks like they added inorganic soil only. It also looks like they added something on top of the inorganic soil, besides the succulent looking plants? Not sure what that is as they did not film them added it to to the tree. Very interesting video. I have added the video to the Re-Potting page under Bonsai Basics. I have made a new Spruce Bonsai page and included the video under it, shown under Conifers Bonsai and Bonsai Tree Information pages.