Tu BiShvat (Hebrew for the 15th day of the Hebrew month of Shvat) is the new year of the trees.
We read the entire Torah over a year, beginning the cycle on the same week as Simchat Torah. The Torah is divided into 54 portions – or parashiyot – and, generally, one portion is read each week on Shabbat.
Tu BiShvat, called the "New Year of the Trees," falls at a seemingly incongruous time of year.
Tu BiShvat is a minor festival whose provenance dates only to the time of the Second Temple. However, the kabbalists who clustered around the great fifteenth-century mystic Isaac Luria of Safed placed great weight on the holiday, creating new festivities, gatherings at which hymns were sung, fruit (particularly carob) was eaten, and four cups of wine were taken (as in the Passover seder).
Sukkot, the Jewish festival of booths (a harvest holiday of thanksgiving), begins on the 15th day of the Hebrew month of Tishrei.
"Rejoicing in the Law;" holiday that celebrates the completion (and then the beginning) of the annual reading of the Torah.
"15th of Shevat;" New Year of the Trees; Jewish Arbor Day, which is a minor festival.
Literally, “four species.” The Torah specifies four species to bring together on Sukkot. The four species are: lulav (branches of palm trees), etrog (citron), hadasim (myrtle branches), and aravot (willows) (Leviticus 23:40).