Kabbalah zu Bereschit 2:5

Similarly, the heavens did not give any powers to the earth until humankind appeared, as it is written, "And no plant of the field was yet in the earth, and no herb of the field had yet grown, for Hashem Elohim had not caused it to rain upon the earth, and there was not a man to till the ground" (Gen. 2:5). All the offspring and products were concealed in the earth. They did not appear, and the heavens were prevented from pouring rain on the earth because humankind did not yet exist. Because it had not yet been created, the revelation of all things was delayed. As soon as humankind appeared, however, "The flowers appeared on the earth," and all the hidden and concealed powers were now revealed.

“No shrub of the field was yet in the earth” {Gen. 2:5}. Rabbi Simeon went on to say: The allusion is to the magnificent trees which grew later, but as yet were minute.

Adam and Eve, as we have said, were created side by side. Why not face to face? For the reason that heaven and earth were not yet in complete harmony, “the Lord God had not caused it to rain upon the earth” {Gen. 2:5}. When the lower union was rendered perfect, and Adam and Eve turned face to face, then was the upper union perfected.