The Wealth of Nations by Part 1 Chapter 11 Page 29

But Democritus, who wrote upon husbandry about two thousand years ago, and who was regarded by the ancients as one of the fathers of the art, thought they did not act wisely who enclosed a kitchen garden. The profit, he said, would not compensate the expense of a stone wall; and bricks (he meant, I suppose, bricks baked in the sun) mouldered with the rain, and the winter storm, and required continual repairs. Columella, who reports this judgment of Democritus, does not controvert it, but proposes a very frugal method of enclosing with a hedge of brambles and briars, which, he says, he had found by experience to be both a lasting and an impenetrable fence; but which, it seems, was not commonly known in the time of Democritus.

Palladius adopts the opinion of Columella, which had before been recommended by Varro.