Venus Fly Trap. Photograph by Bjorn S. Licensed under C.C.O 3.0.

Tell Us What You Know

One day in 1966, the CIA interrogation specialist Cleve Backster was feeling silly. On a whim, he tried clipping a polygraph wire to the leaf of a common houseplant. A polygraph, or lie detector, is typically hooked up to a person to measure factors like increased heart rate and skin moisture, in order to determine whether the subject is truthfully responding to questions. A needle corresponding to physiological changes registers a line on paper; the line will supposedly spike if a person lies. Polygraphs are finicky instruments and their reliability has been repeatedly debunked (simply being attached to one can be enough to make your heart rate jump), but they do successfully measure fluctuations in an organism’s physical state. Backster thought he might be able to incite a spike in the line of the lie detector if he somehow excited or injured the plant. He decided he might set one of its leaves on fire. But as he sat there, contemplating burning the plant, the polygraph needle jumped. Backster—who in his free time was also an acid-dropping astrologist—noted that the spike was identical to the kind elicited by a human fright response. He quickly jumped to the conclusion that the plant could experience emotions like a sentient being. And since he had only contemplated hurting the plant, he also concluded that the plant could sense his thoughts. The plant was a mind reader.

Over the following decades Backster cleaved ever tighter to a theory he developed called “primary perception,” which he believed to be a form of consciousness embedded in the cells of all living beings that, at least in the case of plants, gave them a profound sensitivity to the thoughts and feelings of others. If it had not been the sixties, perhaps his work would have been relegated to the shelves of pseudoscience, but he hit a nerve of the Whole Earth generation with its burgeoning environmental movement. Like Backster, a certain set was already primed to believe in communion with plants in the form of, say, ingesting psilocybin or peyote. Backster became a figurehead for a cultural fascination with plant consciousness. His findings about the ability of plants to sense danger, read emotion, and communicate were publicized widely, notably in the still-popular book The Secret Life of Plants by Peter Tompkins and Christopher Bird, but also on TV shows. His ideas were adopted by the Church of Scientology, and eventually even made it back to the CIA, which invested in its own research about plant sentience.

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