I grafted a bunch of Ingeborg and Keiserinna pear scions onto wild mountain ash trees. I used a variety of grafting techniques, but mostly bark and side grafts. I had about 80% success. Scions are growing slowly, but they are growing.
I will trim it all back this winter and keep it trimmed next spring. I thought maybe there was something wrong with the scion. Could be that all the trees are on the same roots.