Species of plants or wildlife that are not native to a particular area and often interfere with natural biological systems. In extreme cases, non-native species eradicate native species through growth and other chemical means. As an example, the beautiful blue Chicory (Cichorium intybus) is a non-native noxious plant in Boulder, Colorado. Each plant produces 3000 seeds per year enabling it to take over all other nearby species.
The beautiful yet invasive Blue Chicory plant on the Mesa Trail in Boulder, Colorado.