These first two photos are three years and three days apart. In 2013, I grafted 7 seedlings through the base of this Japanse maple, to help full some holes in the nebari. 4 died fairly quickly. I think it was due to being shaded out. The seedlings were short, and just couldn’t quite make it out past the canopy before they were shaded out. Notice that even where the grafts failed, the gaps are closing, and it’s on it’s way to becoming a fairly solid base. Though, without intervention, it will easily take another 10 years.
Look again, with the grafts numbered, then and (best I can tell) now:
The plan is to let them thicken another year, then cut them back short to develop some ramification. This year’s repot wasn’t too aggressive, but it was about arranging the roots radially, and getting a good look at the grafts was important. So, here is the repot: