In recent years, there has been increasing societal awareness of the crucial role that coastal dunes play in protecting against rising sea levels, mitigating climate change impacts, promoting biodiversity, and providing recreational opportunities. In some regions, dune management has been particularly focused on biodiversity and ecosystem restoration and the presence of alien species on dunes raises concerns about how these species become 'native,' 'invasive,' or 'hybrids' and whether they belong in their new ecosystems. These concerns illustrate how certain animals and plants assume different statuses according to normative categories associated with varying objectives. This article explores how perceptions of coastal dunes in the UK have transformed over time, from marginal resource frontiers to highly valued environments shaped by multispecies relations. In addition, this work explores how dunes around the UK emerge as ‘patchy anthropocoasts,’ that is, uneven landscapes designed by human purposes linked to economic activities, conservation, rabbit populations, unwanted vegetation, and the control of unpredictable sand movements. Bringing together diverse historical materials and scientific literature, this article links human and nonhuman histories with present debates on dune restoration from a transdisciplinary perspective rooted in anthropology, environmental history, and the natural sciences.