Thou preparedst room. — The reference is, of course, to the casting out of the heathen in Psalms 80:8.
Didst cause ... — Rather, it struck its roots deep; literally, rooted its roots.
Related Commentaries of Psalms 80:9
Psalms 80:9
9 Thou preparedst room before it, and didst cause it to take deep root, and it filled the land.