On Saturday, November 20, from 1 – 3, the same day that Betsy Williams of The Proper Season conducts the Thanksgiving Centerpiece workshop at Tower Hill Botanic Garden, she will also teach a workshop where students will make a set of three mossy, stylized topiary trees set in terra cotta pots, in either round or cone shapes.  Please bring an apron and floral scissors.  THBG members $54, non-members $60.  To register, log on to www.towerhillbg.org.