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It is a Jewish holiday honoring trees.
Tu Bishvat already is in Hebrew. In English it means 15th of Shvat.
may day,tu bishvat
Tu Bishvat is the new year for trees. It marks the beginning of a new year for tithing the fruits of trees.
Robert Sol has written:
'TU BISHVAT ; PURIM'
'KOFY'
'SUCCOS, SIMCHAS TORAH'