Trees communicate through chemical signals from "summary" of The Overstory by Richard Powers
Trees send messages using scent, just as animals do. The perfume of freshly-mowed grass is a distress call, pleading for mercy. A cabbage's bitter funk is an alarm. A pine's turpentine whispers away herbivores. Trees have a language of volatile chemicals that they use to talk to each other. They warn each other of pests, and they call in other creatures to subdue them. The average tree is in touch with its roots, and the roots are in touch with the fungi, and the fungi are in touch with the other trees. They share their surplus carbon with the sick and the old, and they pass along warnings of dangers. They warn their neighbors when they are under attack, and they band together to fight off threats. Trees have been at it for hundreds of millions of years, speaking in a language older than animals. They h...
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