Tu Bishvat (Hebrew: ט״ו בשבט) is a minor Jewish holiday, usually occurring in late January or early February, that marks the "New Year of the Trees" (Hebrew: ראש השנה לאילנות, Rosh HaShanah La'Ilanot). Tu Bishvat is one of four "New Years" mentioned in the Mishnah. Customs include planting trees and eating dried fruits and nuts, especially figs, dates, raisins, carob, and almonds. In Israel, the flowering of the almond tree, which grows wild around the country, coincides with Tu Bishvat.
Tu Bishvat is celebrated on the 15th day of the Jewish month of Shevat.
Taken from Wikipedia.