Asian knotweeds, invasive alien species

Abstract

Asian knotweeds are part of our landscapes. Introduced in France at the end of the XIXth century, they are now considered among the most threatening species for biodiversity worldwide. This article mobilizes ecologists, geographers, historians and managers in the aim to introduce what we know about these alien invasive species for this special issue. Their ecology is described as well as the history of their invasion, from the first introduction to the change in perception that came with their expansion out of gardens. This article also deals with their numerous impacts and their legal regulation in the French context. Management practices are also described and questioned in the light of a change in paradigm that could help to better take a fresh look at their management.