Many non-native plant species are threatened in parts of their native range

Final paragraph: Here, we show that many plants with non-native ranges experience native range contractions. While we do not argue that non-native populations should generally be seen as opportunities rather than threats to conservation, an overly rigid view of what is considered native – and thus worthy of conservation – risks overlooking the dynamic nature of species ranges, the subjectivity of ecosystem membership, the historical role of long-distance dispersal in shaping biodiversity, and the uncertainty around what is even native to begin with (Pereyra, 2020). Our analysis does not dismiss the importance of assessing species' origins, traits, impacts, and ecological histories. Rather, we call for a more nuanced view, one that acknowledges that non-native populations may, in some cases, offer conservation benefits alongside risks. When assessing their ecological impact, a complementary question to ask is: might there also be value for conservation?