Ḥaza”l suggest that at this season in particular, we honor the spirits of our friends and teachers, the trees. On Rosh HaShanah La’Ilan, the New Year of The Tree, we connect with the spirits of those trees. According to Rabbi Tzvi Elimelekh of Dinov (B’nei Yissakhar):
On this day the saraf, the sap containing the Holy Sparks in those trees, begins its upward flow. That saraf contains a spiritual dimension, a ‘fire’ or ‘burning energy’, the sacred sparks that the fruits of the Holy Land contain in abundance. On this day, HaShem our Creator begins to place the first sacred sparks into the tree, from where the fruits of the coming year will emerge. Those sparks can ignite the reponsive soul with a burning desire to rise even higher and closer to HaShem.
. . . → Read More: Seder Rosh Hashanah La’Ilan: A four worlds seder for Tu Bishvat