On this day, called Tu Bishvat in Israel (Tu Bishvat, Hebrew ט"וּ בִּשְׁבָט), the rainy season usually ends, and nature is reborn. Tu Bishvat is the 15th day of the month of Shevat in the Jewish calendar.
In Judaism, there are four chronologies, four calendars, according to which the age of the four worlds is measured. According to one calendar (the first month of which is Nisan) the history of Israel is counted, according to the second (the first month of which is Tishrei) is the history of all mankind, according to the third calendar (the first month is Elul) the age of animals is measured, and according to the fourth (the first month is Shevat) - plants.
In the ancient Jewish state, it was customary, as the Torah prescribes, to annually separate tithes from the harvest of fruits in favor of the priests and Levites who served in the Temple, who did not have land plots, and tithes in favor of the poor. Since such an action must be carried out annually, it was forbidden to separate tithes from the harvest of one year on account of the harvest of another year. The festival of Tu Bishvat was established by the sages to separate the harvest of one year from the harvest of another.