The Tree of Life has always symbolised the force of life and its origins, the importance of roots and the development of life.
Trees, like nature, are a source of learning. They show us how the man / woman really must be, in his roots, his trunk, and his branches. From a symbolic point of view, man is like a tree. Very often we ignore this similarity and we just live in the roots while totally ignoring the upper part of our being.
Follow the tree, it shows you the way.