This collection explores artistic representations of vegetal life that imperil human life, voicing anxieties about our relationship to other life forms with which we share the earth. From medieval manuscript illustrations to modern works of science fiction and horror, plants that manifest monstrous agency defy human control, challenge anthropocentric perception, and exact a violent vengeance for our blind and exploitative practices. Plant Horror explores how depictions of monster plants reveal concerns about the viability of our prevailing belief systems and dominant ideologies— as well as a deep-seated fear about human vulnerability in an era of deepening ecological crisis. Films discussed include The Day of the Triffids, Invasion of the Body Snatchers, The Wicker Man, Swamp Thing, and The Happening.