Hi Dorothy.... Akadama, lava rock, pumice and course river sand.
Well, I guess I have to post another tree now..
. Here is another, just started training last year, Japanese white pine graft. I found this on at the nursery. It was originally destined to be a mediocre, at best, cascade. Upon a close inspection, I realized that making the side the new front, cutting off the main cascade branch and a few back branches..it could make a pretty nice shohin. Last year, I chopped most of the cascade branch and some of the back branches. This season, the back branches will be further reduced, the whole tree wired and repotted. It is about 7 inches tall with a close to 3 inch base.
Here is the before and after.
Rob