Why don't we recognize plants as intelligent beings?

Islam doesn’t consider plants alive at all, Mancuso and Viola remind us. It has a rich tradition of plant and flower illustration, alongside a ban on the physical depiction of living things. And until recently, Western medicine used “vegetative state” to describe people considered to have lost the ability to think or be aware.

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Clearly, we will never play chess with a rose, nor ask the orchid on our windowsill for advice. But that is the point: humans are guilty of serious parochialism, of defining intelligence in terms of a nervous system and muscle-based speed that enables things to be done fast, say all three authors.

Plants and animals face similar challenges: to find resources and mates, and avoid predators, pathogens and abiotic stresses. In response, says Karban, “plants communicate, signaling within [themselves], eavesdropping on neighboring individuals, and exchanging information with other organisms”. They have adaptive responses that, if they happened at speeds humans understand, would reveal them to be “brilliant at solving problems related to their existence”.

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