Invasive species

(1) A species that demonstrates rapid growth and spread, invades habitats, and displaces other species. (2) Species that are prolific seed producers, have high seed germination rates, easily propagated asexually by root or stem fragments, and/or rapidly mature predispose a plant to being an invasive. For example: The hybrid cattail (Typha x glauca), a cross between native cattails, is extremely aggressive and out- competes its parents and other native species when established. Introduced species that are predisposed to invasiveness have the added advantage of being relatively free from predators (herbivores, parasites, and disease) and can, therefore, expand more energy for growth and reproduction. Invasive species should not be confused with “introduced species.” [Source: USDA National Plant Materials Manual]