Are invasive species a topic in your country? Here, they are. For example, the Chusan palm tree was very popular in Ticino, but they found out that it's invasive and displaces native species.
Now, a different invasive species threatens those palm trees: the South-American palm moth.
But it's not just the palm trees, you see invasive neophytes everywhere. Fleabane, goldenrod and other plants.