An opportunist plant, sometimes pejoratively called a weed, is a species that quickly or vigorously spreads. Some of which, especially persistent exotics, are a threat to the integrity of some ecosystems. Opportunistic plants take advantage of resources and opportunities available in the environment.
Some opportunists are an indicator plant of certain growing conditions that make it more channeling for other plants to compete.
Dispersive is a spreading method that is rapid and far through speeds carried by animals or wind.