All noxious weeds are non-native species and a plant is named by the
State weed advisory board as a noxious weed when it meets one or more of the
Aggressively invades or is detrimental to economic crops or
native plant communities.
Is poisonous to livestock.
Is a carrier of detrimental insects, diseases or parasites.
The direct or indirect effect of the presence of this plant is detrimental
environmentally to natural or agricultural ecosystems.
All noxious weeds are invasive due to the lack of natural insects and disease to keep
their populations in check.
More detailed explanations of each noxious weed occurs with the photographs.
|Can cause severe irritation of the mouth and digestive tract in cattle
which may cause death.
||A colony forming perennial from deep and extensive horizontal
roots. Difficult to control; breaking up roots by plowing only
increases the number of plants.
||Can easily crowd out desired forage.
||Threaten pastures and rangelands.
||Difficult to eradicate because of the long, deep taproot which can
penetrate the soil to a depth of 10 feet and which gives rise to
numerous long lateral roots.
||Invades pasture, range and forest lands along with roadsides, waste
areas, ditch banks, stream banks and grain fields.
||Infestations can impede water flow and reduce habitat for wildlife.
||Widely established in the western US.
||Western states are experiencing a reduction in desirable plant
communities as this species is allowed to spread.
||This creeping perennial is an aggressive invader of rangelands,
displacing desirable grasses.
There are a few links about Noxious Weeds:
Colorado Weed Management
Noxious Weed Information