WHY do plants signal each other underground?

Plants can “communicate” with each other via chemical signals, but their ability to transmit signals is not limited to airborne communication.

Warnings from one plant to another, such as pest infestation, can be transmitted through mycorrhiza, symbiotic fungi whose structures braid the roots of plants and allow them to get much more nutrients and water from the soil.

When an uninfested plant receives an alert, it begins to secrete repellents against specific pests or other substances in advance that attract the enemies of those pests.

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