This article is situated within the intersection of education for social transformation (EST) and ecojustice education (EJE). We have described the benefits of youth participation in an after-school science program offered to socio-economically vulnerable populations in São Paulo (Brazil). More specifically, we explored participants' changing views of sustainability as they engaged in a 24-week project of their choice: The cultivation of a vertical herb garden. The analysis of our discussions and extensive field notes revealed that during the time participants cared for the garden, they developed: (a) A more accurate (refined) conceptualization of sustainability, (b) an appreciation for alternative and viable ways of producing food in urban settings, and (c) a stronger relationship with one another. In the end, involvement in the vertical garden project proved to be a powerful example of how science education can transform the livelihood of youth by expanding their views on human interconnectedness with all forms of life.