How Trees Share Signals Through Forest Networks

Trees can exchange signals through fungal networks and airborne chemicals, warning nearby plants of danger and sometimes moving nutrients between connected trees.

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Trees do not communicate with words or brains, but forests can contain surprisingly complex systems for sending chemical and electrical signals. Many trees form partnerships with mycorrhizal fungi, whose threadlike networks connect roots through the soil. These connections can influence how plants respond to stress and can be involved in the movement of nutrients and chemical signals. Research supports several forms of plant signaling, although some popular claims about forests helping one another are more debated than the simple idea that plants exchange signals. Trees can also respond to threats without relying on underground networks. Some plants release airborne chemicals after being damaged, allowing nearby plants to change their defenses. Acacias, for example, can respond to browsing by increasing defensive chemicals in their leaves, while other plants can release scents that attract predators of insects attacking them. These systems are better understood as chemical signaling and coordinated plant responses than as humanlike conversation. The underground fungal relationships are especially interesting because they connect organisms that may otherwise appear completely separate. Fungi receive carbon from plants while helping roots access water and mineral nutrients, creating a biological partnership that can shape the surrounding forest. Scientists continue to investigate exactly how much information and material moves through these networks, and which proposed benefits are widespread versus context dependent.

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