A scientist enlists the help of the US army to investigate the mysterious disappearance of her father, deep in the Belizean jungle. Caught in the crossfire between a brutal guerrilla army controlled by a mystical warlord, they are also confronted by an even bigger terror giant mutated wasps that are, for some reason, thirsty for blood.

After the unexplained death of their Uncle Arlo, Kayla Nunez and her sister venture to his home in the rural town of Wickenhaven. They plan to claim their share of his estate, but their trip takes a drastic turn after discovering that their uncle's house is occupied by a mysterious relative, Aunt May, who may be harboring deadly secrets. Complicating matters is the deranged, lust-filled tanning salon owner, Dale, and his exotic wife, Joan, whose business in designer handbags is the backbone to the entire town's economy, and possibly the darkest fashion controversy the world will ever know.

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 (Tobias Segal), Adrian and Michael (Eddie Kaye Thomas) as they unlearn everything their psychoanalyst parents have taught them. While Michael's cynical wife Vivian (Thora Birch) discovers she is pregnant, the family is also changing. Charlie's would be boyfriend George (Michael Urie) is in a polyamorous relationship with fitness fanatic Robin (Brittany Snow) and Adrian has developed a unrelenting sex addiction. Meddling parents Felicia (Christine Lahti) and Percy (David Rasche) must decide whether to reignite the spark in their relationship or start all over again. Petunia is a film about a dysfunctional family unit on the verge of a nervous breakdown. This is the story of how they pick up the pieces.