Nancy's big day is marred by the disappearance of Silas, Shane's inflammatory graduation speech, Celia's madness, and a weed deal with Conrad that goes chaotically awry.
Nancy discovers what happened to Esteban and has to take measures to protect herself. Meanwhile, Andy changes his life drastically while Dean, Doug and Celia reconcile their differences.
Nancy gathers a team to go into business with Conrad circumventing Heylia, who has become a grandmother. Silas gets high and is brought home by the police. Nancy finally sleeps with Peter and finds possible evidence he's with the DEA.
Esteban is unwilling to kill Nancy just on basis of Shlatter's word. Nancy denies knowing Guillermo's boss. Lisa's ex-husband catches her and Silas in the act. Celia goes to Mexico to see her estranged daughter. Doug opens Andy's eyes.
The season ends with the entire town of Majestic, including Agrestic, facing destruction from a wildfire set by Guillermo and his Mexican friends. Tara and her fanatical friends try to rescue the cross from the makeshift grow house.
After being threatened by U-Turn and The Armenians, Nancy goes in search of Silas and her hijacked pot. Meanwhile, Celia has Silas arrested for stealing her "Drug Free Zone" signs.
Nancy is still reeling from Peter's revelation when she comes home to face an even greater problem: her youngest son has officially entered puberty; Celia enrolls Isabelle in boot camp.
The Armenian mob muscles in on Nancy's grow house while she deals with Silas and Megan's pregnancy; Nancy evades Celia's attempts to get her involved in an upcoming debate with Doug, and accepts a perfect wedding gift from Peter.