Plants have long been thought to be mute, but according to a new study, they do cry out when they’re injured or lacking water, just at a frequency too high for us to hear.
Generally, researchers observed that plants made significantly more sounds when under stress, and that the sound varied by plant and by the type of stress they were experiencing.
"From previous studies we know that vibrometers attached to plants record vibrations. But do these vibrations also become airborne soundwaves - namely sounds that can be recorded from a distance?” Hadany said. “Our study addressed this question, which researchers have been debating for many years.
"Before placing the plants in the acoustic box we subjected them to various treatments: some plants had not been watered for five days, in some the stem had been cut, and some were untouched,” Hadany said. “Our intention was to test whether the plants emit sounds, and whether these sounds are affected in any way by the plant's condition.”
These sounds would be loud enough to be heard by any creature within three to five metres that could hear within the proper frequency.played a recording of sounds emitted by tomato plants and by grape vines In the greenhouse setting, they also recorded a group of tomato plants as they grew increasingly dehydrated, and found that their sound outpoint increased steadily for the following four to five days after being watered, and then decreased.
Because many animals, such as bats and rodents, are capable of hearing much higher frequencies than we are, researchers guessed that these animals have probably known about the symphony of forests and plants much longer than we have.
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