Watch List

Watch List - Colorado

Weeds whose invasiveness have not yet been determined but are new to the state and have been shown to be invasive elsewhere. Some are widespread and control is recommended, others are only found in limited quantities and elimination is recommended.

CDA posts the updated list on their website.  These species are not regulated by the Noxious Weed Act/Rule.

Baby's breath (Gypsophila paniculata)

Caucasian bluestem (Bothriochloa bladhii)

Common bugloss (Anchusa officinalis)

Common reed (Phragmites australis)

Garden loosestrife (Lysimachia vulgaris)

Garlic mustard (Alliaria petiolata)

Himalayan blackberry (Rubus armeniacus)

Hoary alyssum (Berteroa incana L.)

Meadow hawkweed (Hieracium caespitosum)

Onionweed (Asphodelus fistulosus)

Siberian elm (Ulmus pumila)

Scotch broom (Cytisus scoparius)

Swainsonpea (Sphaerophysa salsula)

Syrian beancaper (Zygophyllum fabago)

Tree of Heaven (Ailanthus altissima)

Ventenata grass (Ventenata dubia)

White bryony (Bryonia alba)

Yellow bluestem (Bothriochloa ischaemum)

Yellow flag iris (Iris pseudacorus)

Watch List - Jeffco Species of Concern

These species are known to occur in limited quantities within Jeffco.  We recommend that they be eliminated whenever found.

Yellow-flag-iris plants.


Garlic mustard - Information Sheet (pdf)

Yellow flag iris - Information Sheet (pdf)