Today is also the Jewish New Year of the Trees, Tu Bishvat. It is a day for planting trees, for giving money for the planting of trees in Israel. It is observed by eating tree fruits and nuts characteristic of the land of Israel, with appropriate brachot. Historically it was the day from which the fruit offerings, brought to the ancient temple in Jerusalem from all over eretz Yisrael, were dated.
The Kabbalists in Tsfat in the 1600's, led by Rabbi Isaac Luria, instituted a short seder for it, called Hemdat he-Yammim . I wonder what Haggadah they used? And whether it is still extant?