Interior designer and garden book author Bunny Williams’s intensively planted 15-acre estate in Falls Village, Conn., has a sunken garden with twin perennial borders surrounding a fishpond, a seasonally changing parterre garden, a year-round conservatory filled with tropical plants, a large vegetable garden with flowers and herbs, a woodland garden with meandering paths, and a pond with a waterfall. There are also a working greenhouse and an aviary with unusual chickens, an apple orchard with mature trees, a rustic Greek Revival-style pool house folly, and a swimming pool with 18th-century French coping. Transportation from BBG for an additional $10 fee is available for a limited number of participants.