New years appear four times in the Jewish calendar. The calendar begins with Jewish new year that is around September. Then there is the new year of the trees, Tu BiShvat, the new year of the spring, and the new year of the summer, and they all symbolize the beginning of the correlating spiritual levels.
The egoistic desire is also made of four levels: the levels of the still, vegetative, animate, and speaking.
A desire on the level of the inanimate nature correlates with the Jewish new year, which is agreed upon and accepted by everyone. The desire on the level of the vegetative correlates with the new year of the trees, Tu BiShvat, which is on the 15th day of the month of Shvat. This is when the birth of nature begins and trees are planted in Israel. Then comes the new year on the animate level, and then the new year on the human level, the speaking level.
From KabTV’s “Fundamentals of Kabbalah” 12/30/18