In the judgment of those ancient improvers, the produce of a kitchen garden had, it seems, been little more than sufficient to pay the extraordinary culture and the expense of watering; for in countries so near the sun, it was thought proper, in those times as in the present, to have the command of a stream of water which could be conducted to every bed in the garden. Through the greater part of Europe a kitchen garden is not at present supposed to deserve a better enclosure than that recommended by Columella. In Great Britain, and some other northern countries, the finer fruits cannot be brought to perfection but by the assistance of a wall. Their price, therefore, in such countries must be sufficient to pay the expense of building and maintaining what they cannot be had without.

The fruit-wall frequently surrounds the