These are newly arrived, uncommon, and potentially dangerous plants that require mandatory eradication from all lands within the state to prevent it from becoming a larger problem. The management goal for List A species is their complete elimination to protect the economic and environmental health of Colorado.
LIST B SPECIES
Help stop the spread. Eradicate, contain, or suppress.
Invasive plants with discrete, statewide distributions that must be managed to stop their continued spread, either through eradication, containment, or suppression, with the specific strategy varying by location and determined by the Colorado Commissioner in consultation with local governments. These are non-native plants already established in Colorado that have the potential to cause significant ecological damage, and their spread is a priority for the state.
LIST C SPECIES
Widely distributed. Control is recommended but not required.
These species are widespread and well-established throughout the state, making statewide eradication impractical. The Colorado Department of Agriculture provides educational, research, and biological control resources to support local management efforts.
