In the 1960s and '70s, a series of questionable experiments claimed to prove that plants could behave like humans, that they had feelings, responded to music and could even take a polygraph test.

In Lena Mueller’s lab at the Salk Institute for Biological Studies, dead plants are OK. “Don’t worry, it’s on purpose,” said Kelly Semtner, Mueller’s high school intern, gesturing at a row of wilted ...

Your garden might not be as silent as you think. A new study shows that plants communicate distress via sounds that—while too high-pitched for humans to hear—might be picked up by other plants and ...

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