A sweeping natural history of the humble trees that built nations, sparked wars, and became the world's most cherished holiday tradition. Every December, millions of people around the globe adorn their homes, offices, and town squares with lavishly decorated Christmas trees to celebrate the holiday season. Yet few pause to wonder: Where did this tradition come from? And in an age of climate upheaval and artificial replicas, will these beloved trees still be here for future generations? In Evergreen, Cornell University professor Trent Preszler weaves together a captivating story of humanity's deeply rooted relationship with evergreens, revealing how the trees shaped economies, launched cultural movements, and propelled America's rise to global prominence. With stunning historical range and lyrical insight, Preszler guides readers from the awe-inspiring evergreen cathedrals of the West to Christmas tree farms in the Midwest, sawmills in the South, the iconic Rockefeller Center spruce in the East, and beyond. Blending cinematic detail with compelling ecological and cultural history, Evergreen explores the hidden tensions between nature, commerce, and spirituality that have confounded humanity for millennia. At once timeless and urgently relevant, Evergreen delivers a stirring reflection on the quiet power of trees, challenging us to reconsider the delicate balance between our restless ambition and the living world that sustains us.