the researchers recorded both healthy and stressed tomato and tobacco plants using microphones. They conducted experiments in a soundproof chamber and later in a greenhouse with background noise. The plants were stressed in two ways, by withholding water for several days and by cutting their stems. The team then trained a machine learning algorithm to distinguish between healthy plants, dehydrated plants, and cut plants.
audio is uploaded in the article
Source : https://scitechdaily.com/scientists-discover-plants-scream-we-just-couldnt-hear-them-until-now/
Unfortunately, Mark passed away. One of the best. Ever. I saw him in Olympia a year or so before he died. Great show, but the man was nearly blind and looked pretty exhausted at the end. He hung out in the lobby signing stuff, must have talked to a hundred fans.