The first occurrence.
And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. Gen 1:11
The primitive root.
Strong’s H6212 eseb, a concrete noun meaning, “green herb,” from an unnamed, unused primitive root meaning, “to be green.” The 3-letter root of the noun is ayin + shin + bet, but according to the Ancient Hebrew Lexicon, the shin was transposed from an original sin.
ayin ע = the eye, thus watch, know, shade
sin ס = the thorn, thus grab, hate, protect
bet ב = the house, thus house, household, family, in, within
The story: The watchful eye (ayin) guards against and gathers (sin, as a shepherd guards against thorns which harm and gathers thorns which help to protect his flock) for his household (bet). A green herb is gathered for the family’s use as food.