The current political emphasis on greater accessibility and public engagement in relation to urban nature raises certain difficulties. Professional botanists, entomologists and other scientists tell me that public policy towards biodiversity and the protection of “wild nature” is being driven increasingly by a public-relations emphasis on certain “flagship species” or vague notions of sustainability rather than detailed knowledge about sites, species and the ecological dynamics of urban space. Those agencies charged with the protection of nature or the fostering of environmental education often lack any specialist expertise leading to a repeated emphasis on a small number of easily recognizable animals or plants. The idea that deeper knowledge requires years of patience and dedication has been supplanted by a culture of immediacy. In such circumstances how can cultural or scientific complexity be effectively communicated? What happens when autonomous criteria for scientific evaluation conflict with externally imposed agendas for reshaping knowledge? The French sociologist Pierre Bourdieu calls for the defence of the “inherent esotericism of all cutting-edge research” yet he also insists on the development of appropriate strategies for the scientific enrichment of the public realm.1 In the case of urban ecology there is a glaring disjuncture between specialized scientific understandings of urban space and mediated discourses of consumption.