Providing a comprehensive guide to the dynamic new landscape of modern herbalism, renowned medical herbalist David Hoffmann explores how ancient healing modalities are once again becoming prominent. Using the concept of viriditas-the understanding of nature as divinely intelligent-Hoffmann examines biodiversity and chemodiversity, elaborating on the ecological role of human-herb interactions and coevolutionary relationships between species. Presenting evidence of medicinal plant use by animals and early humans, he reviews herbalism from its ancient roots to the modern varieties in practice today, emphasizing how herbalism that developed outside of the dominant culture laid the foundations for the effective, simple techniques relevant for our moder world. He examines the radical and non-hierarchical roots of herbalism, considering the parallels between the field's development and the growth of spiritual awakening and social radicalism. Exploring herbalism through the modern scientific lens, Hoffmann reveals the exponential growth in recent research and peer-reviewed literature on phytotherapy and herbs. He describes the problems inherent in herbalism's integration into the global market-place, emphasizing that herbalism must stay rooted in the health of the people to avoid becoming commodified. He offers a range of herbal approaches to support personal and cultural resilience during the myriad crises humanity is facing. Ultimately, Hoffmann says, a vibrant culture of herbalism can have critical implications for the future, serving as a crucial force for health and resilience.