I went to the local bonsai club for a few years, took classes and spent time exploring for candidates out in the woods. Recently I thought I would apply a few things to two ongoing Cannabis Bonsai. The smaller one in the clear container is sitting on a square rock and the roots are wrapping around it. The larger one has just been trained in a spiral shape for now till I find a neat rock or bone to perch it on.
I set a teen seedling on the rock and spread the roots out over the rock, and then buried it to the top of the rock. I’ll dig it out a bit tomorrow to show the roots better. There is a dude from Vancouver that does this with lots of different genetics and I believe sells them.
I hope to get to his skill level with time. Hoping to keep these two alive over winter and see how ancient I can get them to look.