The noxious weeds mandated for control are plants that are non-native to North America. Consequently, these plants do not have the natural checks found in their native land such as insects or diseases. Due to the competitive aggressive nature of these plants they tend to out compete our native vegetation by forming mono-cultures.

Plants on the “A List” have the potential to be very invasive noxious weeds that quickly transform an area. The plants on this list either are not in Colorado yet or are present in very limited numbers and eradication of these species is still possible.

Mandatory eradication of all “A List” species.

Picture	Name	Wanted Dead Poster	Fact Sheet
	African rue
	Camelthorn
	Common crupina
	Cypress spurge
	Dyers woad
	Giant salvinia
	Hydrilla
	Meadow knapweed
	Mediterranean sage
	Medusahead
	Myrtle spurge
	Orange hawkweed
	Purple loosestrife
	Rush skeltonweed
	Sericea lespedeza
	Squarrose knapweed
	Tansy ragwort
	Yellow Starthistle