Hello JavaGAR -

The subject of your post - invasive plant species - is a pet peeve of mine. Here's the scourge of the California coast, Pampas grass (Cortaderia jubata):

Nature.org

I hate the stuff! It quickly smothers all native plant species, leaving nothing but pampas and bare dirt. The coastal natives are tough, wind and drought resistant plants of large variety. But, two plants up to the challenge of annihilation are Pampas grass and Eucalyptus trees.

Both are escapees from backyards and have been spreading like crazy since the '50s.