Metropolitan cities are facing stark inequalities of green space distribution, hindering goals of sustainable development. But outside of human control, spontaneous nature grows in spaces that are neglected or are unaccounted for. Drawing on existing literature and primary research in a range of towns and cities, including Quito in Ecuador, Bengaluru and Kolkata in India, and Whitby in the United Kingdom, the book delves into the morphology, meanings, and values of those small-scale assemblages of wild growth which are typically overlooked. Discussing instead how such settings can be integrated into everyday urban life, the book offers a fresh perspective on issues around green infrastructure, heritage conservation, and environmental education, enabling cities worldwide to become more nature-positive. A unique examination of an under-researched topic, this book will appeal to students, researchers, and professionals across landscape architecture, urban planning, urban ecology, and all related fields.