If any of them fell into trouble or distress the leaves of that particular tree would wilt as a signal to all of them to come to his aid. The tree symbolizes the strength, depth and beauty of the heart and soul of man. Both the Torah and man are likened to trees. Trees are the most time enduring of all of G-d's living creations. They are permanent fixtures of grandeur and beauty.
Trees are deeply and firmly rooted to solid ground.
They grow straight and tall from their roots. Likewise man towers above all of G-d's creations. He has the capacity to attain exquisite levels of character refinement and spiritual grandeur. He is the zenith of G-d's creation. It is our task to become towering pillars of Divine beauty in deed and thought.