Plants do not suffer in silence. Instead, when thirsty or stressed, they make “airborne sounds,” according to a new study
Research showing water-stressed or injured plants emitting high-pitched sounds could have implications for horticultural monitoring.Plants do not suffer in silence. Instead, when thirsty or stressed, plants make “airborne sounds,” according to a study published today inPlants that need water or have recently had their stems cut produce up to roughly 35 sounds per hour, the authors found. But well-hydrated and uncut plants are much quieter, making only about one sound per hour.
The reason you have probably never heard a thirsty plant make noise is that the sounds are ultrasonic — about 20–100 kilohertz. That means they are so high-pitched that very few humans could hear them. Some animals, however, probably can. Bats, mice and moths could potentially live in a world filled with the sounds of plants, and previous work by the same team has found that plants respond to sounds made by animals, too.
The team produced a machine-learning model to deduce whether a plant had been cut or was water stressed from the sounds it made, with about 70% accuracy. This result suggests a possible role for the audio monitoring of plants in farming and horticulture. To test the practicality of this approach, the team tried recording plants in a greenhouse. With the aid of a computer program trained to filter out background noise from wind and air-conditioning units, the plants could still be heard. Pilot studies by the authors suggest that tomato and tobacco plants are not outliers. Wheat (
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