naturalization

Plants that are suited to naturalizing are those that increase and spread without direct assistance from gardeners and generally look good and remain healthy in the specified conditions. (Common naturalized plantings are daffodils, crocus, daylilies, etc.) It can also refer to plants that aren't native to an area but have escaped cultivation and have become established in new areas (often outcompeting native plants.....).

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Naturalized plants are those introduced accidentally or by intent that have accomodated themselves to the growing conditions and become part of the local scene.

Dave