Alaska Exotic Plant Management Team

National Park Service
U.S. Department of the Interior

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Description: The outwash plain of Exit Glacier in Kenai Fjords.


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Native plants are those that live or grow naturally in a particular region.

Exotic, alien, and non-native plants are plants whose presence in a given area is due to accidental or intentional introduction by humans. The majority of non-native plants are beneficial to society, including staple crops and ornamental plants.

A weed is any plant, native or non-native, whose presence is undesirable to people in a particular time or place.

Naturalized plants are non-native plants that reproduce consistently in their new environment and sustain populations over many life cycles without direct intervention by humans.

Invasive plants are non-native plants that produce viable offspring in large numbers and have the potential to establish and spread in natural areas. Invasive plants often have a negative effect on ecosystems and may cause economic losses or harm to human health.

Noxious weeds are plants that have been defined as undesirable by a legal statute - local, state, and/or federal.