Agrestic is the fictional town in which Showtime's hit TV show Weeds takes place for seasons 1-3 with references in season 4. It is said to be in California and a suburb of the Los Angeles area.
It is potrayed to be a generic upper-middle class suburban town with track homes that all look alike.
Through various deals and legalities, Agrestic merged with it's new neighboring town of Majestic (season 3) using Majestic as the official name.
An example of what the town of Agrestic is like would be a PG-13 to R (sometimes NC-17) rated version of Pleasantville's fictional town set present day. Very generic, stereotypical.