… trees are talking to one another. They communicate via pheromones, hormonelike compounds that are wafted on the breeze, laden with meaning… The trees in a forest are often interconnected by subterranean networks of mycorrhizae, fungal strands that inhabit tree roots. The mycorrhizal symbiosis enables the fungi to forage for mineral nutrients in the soil and deliver them to the tree in exchange for carbohydrates… [They] may form fungal bridges between individual trees, so that all the trees in a forest are connected… they weave a web of reciprocity, of giving and taking. In this way, the trees all act as one because the fungi have connected them. Through unity, survival.
– Robin Wall Kimmerer, Braiding Sweetgrass, 20