I have been experimenting with grafting fruit trees for a few years now and am generally successful with apples. I have four apple grafts this year which are looking good. I also made a dual pear this year which looks good, but the three plum grafts all look like failures. I haven't yet succeeded with grafting plum. Any ideas why? Are they more difficult for some reason? Or perhaps they would respond to a different technique. I have been using saddle or cleft grafts in early spring. Open to suggestions.