German forester Peter Wohlleben puts on his writing cap (with the help of English translator Jane Billinghurst) to share the secret life of trees. This book had the potential to be amazing, but the writing bogged it down, laborious and heavy where it could have danced in the wind among the treetops.
So many crazy facts! Trees can accurately identify the insect attacking them by their saliva and release a specific pheromone to attract a “beneficial predator” to get rid of the attacker.
Trees talk to each other by electrical pulses in interconnected root systems carried by fungal networks. WHAT?! This has been deemed the “wood wide web.” Cultivated plants, however, lose their ability to communicate above or below ground, and as isolated beings are easy prey for insects. Trees also help each other out, funneling nutrients to their sick or dying friends.
This is simply insane: “When you measure water pressure in trees, you find it is highest shortly before the leaves open up in the spring. At this time of year, water shoots up the trunk with such force that if you place a stethoscope against the tree, you can actually hear it.”
This also mind boggling: “To protect its needles from freezing, a conifer fills them with antifreeze. To ensure it doesn’t lose water to transpiration over the winter, it covers the exterior of its needles with a thick layer of wax.”
Trees act as disinfectants, killing germs by releasing phytoncide from their needles. Walnut trees have compounds in their leaves that are insect repellent (gardeners are advised to put their benches under walnuts to avoid mosquitoes).
One group of researchers registered roots crackling at a frequency of 220 hertz. “Whenever the seedling’s roots were exposed to a crackling at 220 hertz, they oriented their tips in that direction.”