Abstract

This chapter examines whether we can know that plants are or are not conscious. We consider a recent debate between an optimistic view, which holds that plants might be conscious, and a pessimistic view, which denies that current evidence supports this claim. The optimistic position appeals to similarities between plants and conscious animals, noting that plants exhibit adaptive, flexible, and goal-directed behaviors such as communication, learning, and anticipatory responses. The pessimistic response argues that these similarities are either misleading or irrelevant, since such behaviors can be explained as forms of adaptive responsiveness and do not indicate consciousness. It also emphasizes that plants lack features, such as nervous systems, that are commonly associated with consciousness. We conclude that the pessimistic position appears stronger: there are no good grounds for thinking that plants are conscious. However, we urge caution in concluding that we know they are not. Our current understanding of consciousness remains limited, and we lack a well-supported account of why particular biological features are necessary for it. In the absence of such a theory, claims about plant consciousness remain uncertain.