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A cultigen (from Latin cultus 'cultivated', and gens 'kind') or cultivated plant is a plant that has been deliberately altered or selected by humans; it is the result of artificial selection. For the most part, these plants have commercial value in horticulture, agriculture or forestry. Because cultigens are defined by their mode of origin and not by where they grow, plants meeting this definition remain cultigens whether they are naturalised, deliberately planted in the wild, or grown in cultivation.
Cultigens arise in the following ways: