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.