Trees send messages through mushroom roots like a telephone line, asking for nutrients to grow.
This episode of Tumble explores whether trees can think, prompted by a question from nine-year-old listener Alden. Hosts Lindsay and Marshall investigate with the help of soil scientist and master's student Natalia Mondi. Natalia studies forest ecosystems and works with the renowned researcher Dr. Suzanne Simard.
Alden suggested scientists could study tree roots and mentioned trees send messages through mushroom roots. Natalia's research focuses on the underground network of mycorrhizae, which are fungal filaments connecting tree roots. Dr. Suzanne Simard's famous TED Talk revealed trees communicate through chemical signals in the soil via these networks. In a healthy forest, trees use mycorrhizae to request and share nutrients like carbon and phosphorus across vast distances. Natalia compares this network to neurons firing in a brain or an old-fashioned telephone switchboard.
The episode details Natalia's current work in a Canadian forest on Quaker Nation land that has been damaged by clearcutting and gold mining. This unhealthy forest is dark, lacks plant diversity, and contains skinny, diseased trees packed tightly together. Restoration involves strategically cutting down sick trees to allow light in and promote understory growth. Natalia analyzes soil health by extracting DNA from microbial slime in frozen soil samples to identify which organisms are moving carbon. She describes soil as holding the "memory" of what the forest once was and what it could become again.
A surprising insight is that Natalia's childhood soil-eating habit was linked to a sodium deficiency, showing her body sought nutrients from the earth. The episode reveals mycorrhizae can stretch for kilometers under a single footprint, forming a massive underground communication web. It also reframes "thinking" not as conscious thought but as an automatic signaling process between trees and fungi. The idea that a forest's health can be measured by its soil's microbial activity offers a novel perspective on ecosystem recovery.
The tone is educational and playful, with hosts using humor and analogies to make complex science accessible to young listeners. The style is conversational and narrative, weaving Alden's question with Natalia's personal story and research journey.
Young science enthusiasts curious about nature, forests, and ecology would love this episode's interactive and imaginative approach. Listeners seeking a purely philosophical discussion on consciousness might find the biological focus too narrow.
