Albert Barnes Commentary Ezekiel 17:6

"And it grew, and became a spreading vine of low stature, whose branches turned toward him, and the roots thereof were under him: so it became a vine, and brought forth branches, and shot forth sprigs." — Ezekiel 17:6 (ASV)

Spreading - On the ground, not trained to a pole, so that it might have no other prop but Nebuchadnezzar. As a vine it was less majestic than a cedar (Ezekiel 17:3); but compare (Psalms 80:10).

Whose branches ... - Rather, so that her branches should turn to him, and that her roots should be under him.