Early Detection Rapid Response

Early Detection and Rapid Response (EDRR) can stop the spread of new and emerging invasive plant species before they become established. It is one of the most cost-effective and ecologically viable methods for controlling invasive weeds and is well worth the effort to protect Colorado's natural and agricultural resources. This program's success depends on the participation from as many trained eyes as possible. That is why your help is needed to look out for and report new and emerging invasive species.

Forms & Publications

EDRR Framework & Strategic Plan for Colorado   
In June, 2016, the Noxious Weed Program staff, along with a team of weed professionals, finalized the new EDRR Framework & Strategic Plan for the state. This document provides goals and objectives for EDRR in Colorado and will be adjusted as those goals are met.

Spotter Form
Have you detected an EDRR Species (Watch List or A List) or a suspicious new invader? Report via this form.

Voucher Specimen Instructions  Sample Collection Form 
Use these forms for verification and entry into the state database if identified as a Watch List species.

Watch List

The Colorado Noxious Weed Watch List  consists of species that have been determined to pose a potential threat to the agricultural productivity and environmental values of the lands of the state and require careful observation. Many species included on this list are not yet known to occur in the state but have been recognized as noxious or problematic by another state or states in the region. For the included species that do occur in Colorado, more information is needed about the distribution and effect on agricultural and natural lands in the state.

If you find a population of one of the Watch List species, please fill out the Spotter Form.

Watch List Species

Asian mustard
Asian mustard

Brassica tournefortii
Baby's breath
Baby's breath

Gypsophila paniculata

Brazilian elodea

Egeria densa

Common bugloss

Anchusa officinalis

Common reed

Phragmites australis

Garlic mustard

Alliaria petiolata
Garden loosestrife
Garden loosestrife

Lysimachia vulgaris
Himalayan blackberry
Himalayan blackberry
Rubus armeniacus
Himalayan blackberry
Hoary alyssum

Berteroa incana

Meadow hawkweed

Hieracium caespitosum


Asphodelus fistulosus

Purple pampasgrass

Cortideria jubata

Scotch broom

Cytisus scoparius

Sericea lespedeza

Lespedeza cuneata


Sphaerophysa salsula

Syrian beancaper

Zygophyllum fabago

Water hyacinth

Eichhornia crassipes

Water lettuce

Pistia stratiotes

White bryony

Bryonia alba

Woolly distaff thistle

Carthamus lanatus

Yellow flag iris

Iris pseudacorus

Yellow floatingheart

Nymphoides peltata