The Hidden Life of Trees: What They Feel, How They Communicate — Discoveries from a Secret World

by Peter Wohlleben

Trees, it turns out, have a completely different way of communicating: they use scent.

The saliva of each species is different, and trees can match the saliva to the insect. Indeed, the match can be so precise that trees can release pheromones that summon specific beneficial predators.

Scientists have determined that slow growth when the tree is young is a prerequisite if a tree is to live to a ripe old age.