Albert Barnes Commentary Jeremiah 10:5

"They are like a palm-tree, of turned work, and speak not: they must needs be borne, because they cannot go. Be not afraid of them; for they cannot do evil, neither is it in them to do good." — Jeremiah 10:5 (ASV)

They are upright ... - Rather, “They are like a palm tree of turned work,” that is, like one of those stiff, inelegant pillars, something like a palm tree, which may be seen in oriental architecture. Some translate thus: “They are like pillars in a garden of cucumbers,” that is, like the blocks set up to frighten away the birds; but none of the ancient versions support this rendering.