is a punctual (instant state-change) verb (aka ). That is, almost certainly means that the forest is full of (already-grown) various trees, not that various trees are in the process of growing now.
> Why don't dictionaries include this kind of things?
Unlike the verb conjugation patterns (godan, ichidan, etc.), the differences between action/stative/punctual are often blurry, and it's almost impossible to perfectly categorize them. See discussions about and .
> Do Japanese ones do?
Unfortunately, no.