Premonition

Premonition (also known as Head or The Impure) is a 1972 horror film written and directed by Alan Rudolph. The film was Rudolph's first after being an assistant director of 11 episodes of the 1960s sitcom The Brady Bunch, as well as the films The Big Bounce (1969) and Riot (1969).[1] Originally titled Head, the distributors first changed the title to Premonition and later for a time to Impure.[2]

Red flowers cause three druggie college students to have premonitions when they see their own deaths. They then start dying in the manner of their earlier premonitions.