The Talmud refers to 15 Shevat in Spring as the New Year of Trees. The date is important for observing Biblical commandments, specifically for determining the tithe and the fourth year for the fruit of a tree. Fruit which begins to grow between 15 Shevat in one year and the next is regarded as the Fruit of the year. It is a day of joy, celebrated in modern Israel as the Day of Treeplanting.