The aim of this report is to assess the economic impact of leafy spurge in the province, with a focus on southern Manitoba. The acreage of leafy spurge was based on geographic land use information, existing databases on known spurge infestation and consultation with weed supervisors and technical experts. In addition to presenting a map showing the potential distribution of leafy spurge in southern Manitoba, the report also provides a brief overview of the invasion process with a focus on identifying the economic factors which cause the spread of invasive species.