This practicum is comprised of research into Canadian community-based urban agricultural practices and four case studies of projects in the City of Winnipeg, Manitoba. Through the use of a literature review to investigate relevant urban agricultural issues it was established that community based urban agriculture is a large and complex topic that can be analyzed through four general characteristics to determine its manifestation in the landscape. These four characteristics--physical, economic, social and ecological--illustrate the far-reaching implications of the practice of urban agriculture and its relevance to the creation of sustainable cities. Four case studies were chosen to investigate different forms of urban agriculture--rooftop gardens, greenhouse/hydroponics, allotment gardens and community gardens. These four case studies were then examined to test urban agricultural theory and determine whether general assumptions about the theory can be made in reference to Winnipeg. (Abstract shortened by UMI.)