The holiday of Tu B'Shevat - the New Year for Trees symbolizes more than just a birthday, or an Arbor Day.
Trees have importance beyond their beauty and utility.
They signify growth, renewal, and the continuity of life. And in ancient times, the New Year for Trees was an important milestone in the Jewish calendar year with respect to the social structure of society. The Tu B'Shevat holiday is when we reaffirm the strong links between the people of Israel and the Land of Israel. This bond, symbolized by the deep roots of the tree, is a major theme of the day. It's also about contemplation of the Source of everything.