Plutarch Quaestiones Convivales 8.4.2

[2] This discourse of Herodes seemed to give occasion for a query about Nicolaus, which would be as pleasant as the former. Therefore, said Sospis, let every one carefully give his sentiments of the matter in hand. I begin, and think that, as far as possible, the honor of the victor should remain fresh and immortal. Now a palm-tree is the longest lived of any, as this line of Orpheus testifies: And this almost alone enjoys the privilege (though it is said to belong to many beside) of having always fresh and the same leaves. For neither the laurel nor the olive nor the myrtle, nor any other of those trees called evergreen, is always seen with the very same leaves; but as the old fall, new ones grow. So cities continue the same, where new parts succeed those that decay. But the palm, never shedding a leaf, is continually adorned with the same green. And this power of the tree, I believe, men think agreeable to, and fit to represent, the strength of victory.