Male viera are secretive, aggressive occasionally, and quite territorial...even amongst themselves. So we avoid their company until we've need of them. [Not very often considering the lifespan of a viera.]

The Green Word is the law of our people that forbids outside contact with others and forbids viera from leaving the Wood in which they were born. Those who break this law are considered outcasts...they can no longer communicate with the Wood. The voices of the trees no longer reach their ears. [There is a note of sadness to her voice, there is isolation in not being able to hear the trees.] I suppose this answers your last question as well? We can leave the Wood, but it goes against our laws and comes with it a set of consequences.