From this you can understand that although the blessed Creator rules over the earth and everything has an angel assigned to it, nevertheless of greatest importance is the fact that everything is connected to the supernal attributes.29I.e., the sefirot. As they said there in the Zohar: “why is it written, ‘I went down to my walnut garden‘?30Song of Songs, 6:11. He said to him, come and see. This is the garden that went forth from Eden and it is the Shekhinah.31The tenth sefirah, Malkhut.
It is often called Shekhinah, the divine presence, ‘Walnut’ refers to the Holy Chariot,32The chariot is described in Ezekiel’s vision. It is located under the tenth sefirah. the four tributaries that spread out from the garden like a nut...”33Zohar, ibid. From this we can infer that herbs can be distinguished by the pre-eminence of their divine roots above.