When I bought this Acer palmatum var. dissectum 'Waterfall' at a reputable nursery last year, I didn't notice until a few months later that the graft was seriously compromised. I wonder now if the problem was even visible at first. Anyway, I sent these photos to the nursery and they gave me credit for another purchase. They didn't ask for the tree back and I haven't had the heart yet to pull it up and get rid of it. What do you maple experts think? I can't feel any roots immediately under the damaged side but maybe some are growing lower in the soil. By and large, the tree looks healthy above ground although there is a dead branch on the other side. If I thought it would heal itself in time, I would leave it be.