Colorado Noxious Weeds

The Colorado Department of Agriculture publishes a list of the "worst" noxious weeds in the state. It separates them into List A, List B, List C, and Watch List, from "most noxious" to "least noxious" respectively. You can see the full list here, but I've compiled a short(er) list of plants that you might expect to see in Harvey Park, or Denver in general. I'd hope that if you think you have some of them growing in your yard (accidentally or deliberately), you'll consider removing them as quickly and aggressively as possible. While some of these plants have more benign lookalikes, quite a few of them have lookalikes that are also nasty weeds. Please google these plants or search for them on the Colorado DoA website for more information about how to identify them, why they're a problem, and how to best get rid of them.

List A
Myrtle spurge - Euphorbia myrsinites

Purple Loostrife - Lythrum salicaria

List B
Canada Thistle - Cirsium arvense

Dalmatian Toadflax - Linaria dalmatica (broadleaf) & Linaria genistifoila (narrowleaf)

Diffuse Knapweed - Centaurea diffusa

Hoary Cress - Cardaria draba

Leafy Spurge -Euphorbia esula

Musk Thistle - Carduus nutans

Russian Olive - Elaeagnus angustifolia

List C
Common Mullein - Verbascum thapsus

Cheatgrass - Bromus tectorum

Field bindweed - Convolvulus arvensis

Puncturevine - Tribulus terrestris

Watch List
Pampas Grass - Cortideria jubata