Not indigenous, but apparently becoming naturalized.

Introduced to the country. Not endemic

Arrived in the geographical area specified from somewhere else by any means (adjective); not native (non-indigenous) to the area in which it has arrived. Because of its usefulness, this expression deserves far wider use in the literature than it has obtained.

a. (L. advenire, to arrive) a plant that is not native to the environment.

A species that is not native and has been introduced into the area but has not become permanently established.

not native and not fully established; locally or temporarily naturalized; "an adventive weed"

an exotic plant that is introduced and naturalized.

introduced to an area recently. cf. introduced, naturalised.