'Herb bearing seed,' as mentioned in Genesis 1:29, signifies truth in terms of its use. (Arcana Coelestia 57) Every herb in the Bible signifies some type of knowledge.

'Green herbs,' as mentioned in Genesis 1:30, mean food for the natural man.

'Eating the herb of the field,' as mentioned in Genesis 3:18, signifies that a person should live as a beast.

'Herb of the field' signifies spiritual truth.

(References: Arcana Coelestia 7626)