What should they do to the roots?
Rashi: They should leave them in the ground.
What is the meaning of "uve'Esor Di Farzel u'Nchash"?
Rashi: Put its legs in an iron Kli, like they do to a horse, that they put it in ashes. So fetter it. Ibn Ezra - this is like "va'Ya'asruhu bi'Nchushtayim."
Malbim: The interpretation begins inside the dream. One does not fetter a tree, rather, a wild man or lunatic. Eating herbs and immersing in dew apply only to Chayos. After an illness of melancholy will fall on him, he became a wild man and damage everything around him. He wanted to flee to the forest. Surely they invigorated to stop him and fetter him, like they do to lunatics.
What is the meaning of "b'Dis'ah [Di Vara]"?
Rashi: In grass, i.e. in the marsh, lest it move from there.
Malbim: Afterwards, doctors saw that he became an animal and wants to eat grass. They gave to him grass in his house from outside.
What is "Yitztaba"?
Rav Sadya Gaon (12, 22): He will be laundered. (He will be naked.) The Targum of Yechaves is Yetzaba.
Rashi: It will always soak. This is an expression of Tevilah 1 .
Ibn Ezra: It will be satiated [with dew].
Malbim: Afterwards, they saw that he wants to bathe in dew. They gave to him dew to immerse and bathe in it.
What do we learn from "v'Im Cheivesa Chalake"?
Rav Sadya Gaon: Animals will have Bi'ah with him. "V'Shod Behamos Yechisan" (Chabakuk 2:17) - he will be a Chasan to animals.
Malbim: All this (fettering him, feeding him grass, letting him bathe in dew) did not help, until they let him flee to the Midbar to eat grass together with Chayos - his portion was with them.
