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Plants on the “B List” have the potential to be very invasive noxious weeds that quickly colonize an area.
The C List species in Colorado inhabit large amounts of acreage making their eradication state wide, impossible.
The Colorado Department of Agriculture is concerned with other potentially invasive species; this resulted in the Watch List.
There are a number of nuisance plants and native plants that are not on the noxious weed lists. On this page, these species are pictured to help with ID.
It is essential to have good references if you are going to identify the vegetation on your property. This page highlights books and other printable resources.
The Colorado Department of Agriculture has evaluated the noxious weed situation throughout the state. As a result they have created a hierarchy policy for certain species across the state. 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.
Keep in mind; 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. Many of these species are also toxic to livestock and wildlife, or have limited grazing potential.
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Cypress Spurge(PDF, 721KB) Hairy Willow-Herb(PDF, 399KB) Japanese Knotweed Myrtle Spurge(PDF, 721KB) Purple Loosestrife(PDF, 535KB)
Yellow Flag Iris
Dyer's Woad Giant Knotweed Mediterranean Sage Orange Hawkweed Yellow Starthistle
African Rue Bohemian Knotweed Elongated Mustard Giant Reed Meadow Knapweed Rush Skeletonweed
Camelthorn Common Crupina Flowering Rush Giant Salvinia Hydrilla Medusahead Parrotfeather Squarrose Knapweed Tansy Ragwort