A woman stands alone onstage in a greenhouse completely cluttered by pots, dirt and plants. Occasionally, another person or two will join her for a time, but the true stars of “The Verge” are this woman and her plants.

Pitt Mainstage’s performance of “The Wolves,” directed by Kelly Trumbull, a visiting assistant professor in the Theatre Arts Department, opened this past Thursday, Nov. 14, at the Richard E. Rauh Studio Theatre.