Mustard plant

Mustard plant (Sinapis arvensis)

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Contributed by Rob Richmond

Russian Thistle (Tumbleweed)

Russian Thistle (Salsola australis)

African Fountain Grass

African Fountain Grass (Pennisetum setaceum)

Invasive species in California

Invasive species, alien species, exotic pests, bio-pollution, non-indigenous species, or invasive alien species, are common names that categorize non-native animals, microbes, diseases, or plants that are pests.  These pests are not native in areas in which they cause problems and they are considered "invasive" because they invade and establish populations in new areas and the resulting uncontrolled population growth and spread causes economic or environmental problems.