Lucerne is a minor character in The Year of the Flood. She is Ren's mother, and lives with her daughter, Zeb and Amanda in an abandoned building called the Cheese Factory, '...about five blocks from the Garden'.

Often portrayed as vain and a neglectful mother, Lucerne's principal concerns are Zeb's whereabouts and her own appearance. Though Lucerne cites concerns about the environment as the reason for joining the Gardeners and moving in with Zeb, we later learn that she merely left her old husband and Ren's father for 'love, or just sex.'