The Roxbury-Bridgewater Garden Club will hold its annual plant mart on the lawn of the Bridgewater firehouse on Route 133 May 18 from 8:30 a.m. to 12:30 p.m. The sale will feature member-dug and divided perennials, herbs, and organic tomatoes and vegetables, as well as garden boutique items and a display with information on how to attract butterflies to a garden.