'Grapes' in the Bible

and he digged it, and gathered out the stones thereof, and planted it with the choicest vine, and built a tower in the midst of it, and also hewed out a winepress therein: and he looked that it should bring forth grapes, and it brought forth wild grapes.

What could have been done more to my vineyard, that I have not done in it? wherefore, when I looked that it should bring forth grapes, brought it forth wild grapes?