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)
  • Perennial Sweet Pea (Lathyrus latifolius) 
  • Scotch broom (Cytisus scoparius)
  • Swainsonpea (Sphaerophysa salsula)
  • Syrian beancaper (Zygophyllum fabago)
  • Tall Oatgrass (Arrhenatherum elatius)
  • Ventenata grass (Ventenata dubia)
  • White bryony (Bryonia alba)
  • Yellow bluestem (Bothriochloa ischaemum)
  • Yellow mignonette (Reseda lutea)