Controversy surrounds the subject as opponents defend their respective interests.
On the other hand, environmental extremists lobby for the good of the natural environment regardless of economic impacts. Consumers often seek new and interesting additions to their landscapes. The ornamental industry is largely to blame for the current situation. Biological invasions in the 20 th century increased dramatically and will continue on this course if we fail to learn from past mistakes. A large part of the problem comes in declaring what qualifies a plant as an invasive species.