An off-beat family of New Yorkers must come to terms with their own misgivings about life, relationships and the sheer unpredictability of love itself. Petunia weaves together the lives of brothers Charlie, Adrian and Michael as they unlearn everything their psychoanalyst parents have taught them. While Michael’s cynical wife Vivian discovers she is pregnant, the family is also changing.  Charlie’s would-be boyfriend is in a polyamarous relationship with fitness fanatic Robin, and Adrian has developed a unrelenting sex addiction. Meddling parents Felicia and Percy must decide whether to reignite the spark in their relationship or start all over again…