Plants have no brains, no nerves, and no muscles, yet they sense light, gravity, touch, and chemical signals from their neighbors with a precision that unsettles the old line between plant and animal. Director Jacques Mitsch gathers botanists and researchers who show how a Mimosa plant learns to stop closing its leaves when a repeated stimulus turns out to be harmless, retaining that lesson for weeks without anything resembling a nervous system. Root tips are filmed growing around obstacles as if navigating, and vines are shown reaching for the exact stake they need before touching it, raising the question of how a rootless intelligence might work. The film moves through laboratories and greenhouses where scientists measure electrical signals traveling through stems and test whether plants can be said to remember, decide, or communicate. It does not claim plants think the way animals do, but it builds a careful case, experiment by experiment, that plant behavior is stranger and more coordinated than a simple stimulus-response machine.