I'm heartbroken - yesterday I discovered that someone snapped off the top half of my dwarf spreading JM. The tree was planted in May 2005, it it in my front yard. It was about 30" tall. Someone broke the main trunk about halfway down. The trunk has two sound branches left. The break is clean, and sap is flowing. I have the top of the tree, with 4 small branches. Can I graft or fasten the broken top back to the trunk? Can I root the top part? I'm in Cambridge, Mass., where we are having a very mild winter, the ground is not frozen. Any help or suggestions would be greatly appreciated.