become attached by or as if by the process of growth(verb.change)
Example: The tree trunks had grown together.
source: wordnet30
To increase in size by a natural and organic process; to increase in bulk by the gradual assimilation of new matter into the living organism; -- said of animals and vegetables and their organs.(verb)
source: webster1913
To cause to grow; to cultivate; to produce; as, to grow a crop; to grow wheat, hops, or tobacco.(verb)