Invasive barberry and winged euonymous
The two above plants are exotic invasives that easily escape cultivation and are crowding out important native plants that provide food and shelter for native bird species and wildlife as well as larval hosts for critical native butterflies and pollinators. If you are interested in educating the public, you might either remove these plants or make special note of the problems associated with these particular species. Thank you Diane Cooke
Certified GKH Gardening Expert
This is very true in some areas. This is also true of any plant species, as any species has the potential to become invasive given the right conditions, and it would seem a bit excessive to post a warning on every plant posted.
There are places where plants that are invasive are quite docile, when they are far enough from their natural habitat to thrive. As always, it is wise to make sure that any plant that you intend to put into the area is not invasive before planting, as a responsible gardener.