The Japanese practice of forest bathing, shinrin-yoku, changes the levels of stress and pleasure hormones in the body, decreasing cortisol and increasing serotonin. And if being around one tree feels good, imagine how a hundred trees would feel. In her first botanical nonfiction in more than a decade, Amy Stewart brings us captivating stories of people who spend their lives collecting trees and asks them: what drives one to collect something as enormous, majestic, and deeply rooted as a tree? In her gentle, intimate, slyly humorous way, Stewart brings fifty of these people to life, organizing their stories into categories. There are the community builders--like Shyam Sunder Paliwal who, after the death of his daughter, began a movement in his Rajasthan village to plant 111 trees whenever a girl was born--who do the remarkable work of knitting people together under an arboreal canopy. There are seekers who have taken their passion for trees around the world, or even into space.