Tu BiShvat is known as “New Year of the Trees”. The holiday is observed on the 15th of the Hebrew month of Shvat.
Scholars believe that originally Tu BiShvat was an agricultural festival, marking the emergence of spring. In the 17th century, Kabbalists created a ritual for Tu BiShvat that is similar to a Passover seder. Today, many Jews hold a modern version of the Tu BiShvat seder each year.
Today, Tu BiShvat has become more of an environmental holiday: a day to remind us of the Jewish duty to care for the natural world, and a tree-planting festival for Jews throughout the world.