Jardins Botaniques du Grand Nancy et de l'Université de Lorraine

Should we be afraid of exotic plants?

While the number of imported exotic plants is increasing, not all become invasive species.  Assessments carried out in different parts of the world have led to the 10% rule. Of 1000 imported exotic plant species, approximately 100 will be observed at least once in nature (introduced exotic plants), only 10 will survive in a lasting way in the natural environment (naturalized exotic plants) and only 1 of these might become invasive.