כָּסּ֣וּ הָרִ֣ים צִלָּ֑הּ וַ֝עֲנָפֶ֗יהָ אַֽרְזֵי־אֵֽל׃
The mountains were covered with the shadow of it, And the mighty cedars with the boughs thereof.
Mishnah Sheviit
They may clear away stones until Rosh Hashanah. They may trim, prune and remove [excess parts of the tree] until Rosh Hashanah. Rabbi Joshua says: just as one may trim and remove in the fifth year so too may one perform this work in the sixth year. Rabbi Shimon says: as long as I may legally tend the tree itself, I may remove [excess parts of it].