How To Grow Tree Together

Not sure about fusing two halves of a tree together - exposing the roots would tend to kill the tree or unsettle it. If two trees grow close enough together so that their trunks touch each other anywhere along the length of the tree, then they will eventually fuse.Loosely tie the two stems together with twine and interlace any lateral branches of the two trees where they meet. The stems eventually grow together,