Why yielded it wild grapes?

"And now, pray, I will tell you
What I will do to my vineyard:
I will take away the hedge thereof,
That it shall be devoured;
I will break down the wall thereof,
That it shall be trodden down;
Yea, I will make a waste thereof,
That it shall not be pruned or weeded.
Then it shall put forth thorns and thickets of brambles;
The clouds I will command that they rain not thereon."

Everybody understood now that Isaiah was speaking a parable and that
its application was to them and to their country. But who was the
"friend" who possessed this vineyard? Isaiah did not hold the
questioners in long suspense:

"For the vineyard of the Lord of hosts is the House of Israel,
And the men of Judah are His cherished plant;
And he looked for justice, but, behold! bloodshed;
For righteousness, but, behold! a cry of distress."

Then Isaiah launched forth into a powerful denunciation of the social
evils of which Judah and the leading Judeans were guilty--a sixfold
woe that was rushing the Nation on to destruction.

"Woe unto them that join house to house,
Who add field to field,
Until there is no space left,