Plant Cognition—An Empirical Primer: Evidence, Implications, and Ethics

ABSTRACT Recent advances in plant biology suggest that plants engage in complex behaviours once thought to require nervous systems. This article surveys the empirical foundations of plant cognition, covering research on goal‐directed movement, decision‐making, anticipatory behaviour, communication, phytoacoustics, and plant neurobiology. In addition, we examine evidence for systemic signalling and anaesthesia in plants, alongside parallels and contrasts with animal cognition. These findings indicate that cognition may not be restricted to neural organisms, challenging conventional boundaries of mind. Building on this empirical base, we explore the philosophical and ethical implications of attributing cognition to plants. The discussion engages classic debates about other minds, functionalism, multiple realisability, and the possibility of plant sentience. Even if plant sentience remains speculative, their cognitive complexity raises broader questions about ecological value, precautionary concern, and the scope of moral consideration. Taken together, these discussions highlight how empirical discoveries in plant biology intersect with enduring philosophical questions about mind, intelligence, and moral status. A companion article, Plant Cognition—A Methodological Primer, provides the necessary theoretical and methodological background, whereas this piece focuses on evidence and implications.