Since the rise of urban civilization, vegetated public space has been a strategy to enhance the experience of living in cities. The purpose of this course is to explore the theoretical and practical expressions of this urban greening aspiration, defined here as the introduction or conservation of outdoor flora in cities. Toward this goal, the course is organized in two parts: First, we will analyze the various discourses that have, and are currently, animating urban greening practice. Second, we will explore how urban greening is expressing itself in cities around the world today.