The silence of the lettuces

"Stressed plants show altered phenotypes, including changes in color, smell, and shape. Yet, airborne sounds emitted by stressed plants have not been investigated before. Here we show that stressed plants emit airborne sounds that can be recorded from a distance and classified."

https://www.cell.com/cell/fulltext/S0092-8674%2823%2900262-3?dgcid=raven_jbs_etoc_email