This rooftop haven for urban agriculture is an after-school learning space in a neighborhood with little access to safe outdoor environments, and adds an unusual dimension to traditional green roof design: the youth center’s full-time gardener uses a planting system custom-designed by Hoerr Schaudt as a teaching tool. The garden maximizes two heat sources – ambient heat from the building and solar energy – which permit gardening nearly all year, while soil depths of nearly a foot allow for a wide variety of plant material.