This study explores the factors that drive or hinder organisations to implement green supply chain management initiatives. A literature review identifies the main categories of internal and external drivers of green supply chain management practices, including organisational factors, regulation, customers, competitors and society, but there is little indication of suppliers as drivers for green supply chain management. Internal barriers include cost and lack of legitimacy, whereas external barriers include regulation, poor supplier commitment and industry specific barriers. An explorative study is conducted based on interviews from seven different private and public sector organisations. Encouragingly, across the organisations, more drivers than barriers to environmental supply chain management are identified. Organisations seem to be more influenced by external rather than internal drivers. The barriers to environmental supply chain management experienced by organisations tend to be both internal and external.