Reference for Bava Batra 163:5
וליחוש דלמא מסקא ארעא שירטון וא"ל תלתא זבינת לי ואית לי ארעא אלא אמר רב נחמן יקוץ וכן אמר רבי יוחנן יקוץ
R. Nahman said: We have it by tradition [that] a palm-tree has no stem.<span class="x" onmousemove="('comment',' This is explained in the Gemara. ');"><sup>8</sup></span> R. Zebid was of the opinion that this means [that] the owner of the palm-tree has no [rights to that which grows from the] stem, because since [the tree] is destined [when it dries up] to be dug and taken out with the roots,<span class="x" onmousemove="('comment',' Unlike other trees, which can be made to grow afresh when their branches and upper sections dry up, by cutting them down to their stems, the palm tree, like the cedar (supra 80b). cannot be made to grow afresh out of its cut stems. They are, therefore, ultimately useful as wood only. ');"><sup>9</sup></span>