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


New! 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 an Watch List species.

Watch List


The Colorado 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
Spiney cocklebur
Bathurst burr /
Spiney cocklebur

Xanthium spinosum

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

Japanese blood grass/
Cogongrass

Imperata cylindrical

Meadow hawkweed
Hieracium caespitosum

Onionweed
Asphodelus fistulosus

Purple pampasgrass
Cortideria jubata

Scotch broom
Cytisus scoparius

Sericea lespedeza
Lespedeza cuneata

Swainsonpea
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

Yellowtuft
Alyssum murale & A. corsicum