Trees talk to each other in the forest. They share resources through mycorrhizal networks of fungi. The taller trees take in more sunlight, make more sugars than they need, and share them with smaller trees, in the shade. They also communicate signals warning of predators. Recipients of those warning signals can mount immune system strategies to strengthen them against attacks.
The value of hub trees in underground exchanges has been overlooked in traditional clearcutting or forestry practices and is finally changing based on much of this research. This allows for healthier forests, and deeper respect for how trees communicate.