Adapted from the 1973 book by Peter Tompkins and Christopher Bird, this film argues that plants respond to human emotion, music, and even violence directed at other living things nearby. Scientists and researchers demonstrate polygraph-style experiments in which electrodes attached to leaves register spikes when a nearby shrimp is dropped into boiling water or when a person merely thinks about harming the plant. Time-lapse photography shows vines curling toward supports and flowers opening in accelerated bloom, while interview subjects describe talking to their houseplants and playing them classical records to encourage growth. The film moves from greenhouse experiments to Findhorn, the Scottish garden community famous for producing oversized vegetables that its founders credit to cooperation with plant spirits. Stevie Wonder's synthesizer score runs under most of the footage, giving the visuals a dreamlike quality that matches the film's central claim: that a form of consciousness runs through the plant kingdom and connects it to our own. Mainstream botanists have long disputed the science, but the film presents its case without qualification.