PLANTS - Are invasive plants a problem in Europe? Controversial views among invasion biologists

Some introduced (i.e. non-native) plants become abundant, threaten species richness and the well-functioning of ecosystems, the economy, or health (plant invasion). Environmental policies that attempt to restrict the expansion of non-native species are based on a consensus among scientific experts that invasions are a serious environmental problem. An example of a problematic non-native species in many parts of the world is Fallopia japonica, the ...

http://phys.org/news/2014-02-invasive-problem-europe-controversial-vie