“…The sounds plants emit are like popping or clicking noises in a frequency far too high-pitched for humans to make out, detectable within a radius of over a meter (3.3 feet). Unstressed plants don't make much noise at all; they just hang out, quietly doing their plant thing.…”
www.sciencealert.com

Plants Really Do 'Scream'. We've Simply Never Heard It Until Now.
It seems like Roald Dahl may have been onto something after all: if you hurt a plant, it screams.
