naturalized

(ecology) Of a species, having become permanently established after being introduced.

1. A term used to describe a plant that grows without assistance and reproduces in an area other than its native region. For example, many roadside wildflowers, such as oxeye daisy, Leucanthemum vulgare, are European natives that have naturalized in the United States.
2. A term used to describe garden plants such as daffodils that spread by themselves and persist for years with no human care or intervention.