The new year of the trees, celebrated with a mystical seder (first created by the Kabbalists) at which four cups of wine are drunk and different kinds of fruit are eaten. In the State of Israel, Tu B’Shvat is Arbor Day, marked with the planting of trees. Tu B’Shvat also has become a modern holiday of the environment, with new seders and haggadot written to reflect this interest.