what's wrong with exotic plant species?

when i first read the notice, i was slightly taken aback. why are they removing exotic plants? are all exotic plants invasive?

when something is described as 'exotic', we tend to think of it as something coming from an asian or a tropical country. but the words 'exotic species' actually refer to plants or animals that are introduced into the local community. exotic plants are not necessarily strange or unusual; they are just alien or foreign.

so the npark people are getting rid of plants that are not native to our country and replacing them with local species.