I repotted a palmatum about two weeks ago because it was in a well-protected area of my garden and benefited from a few hotter days; I cut some of the roots, put them in a pot, sealed the top with wax and left them in my garage for a few days. I also have an acer shirawasanum that leafs out later so I tried to graft a branch tip directly to the root. I don't think it will work, but I put the grafted plant under a cold frame. The buds are swelling just like the ones on the tree the scion comes from, but again, i doubt it will work. Has anyone tried this kind of graft?