Information Sheet on Hairy Willow-Herb

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Hairy Willow-herb (Epilobium hirsutum) Richard Old, XID Services, Inc., Bugwood.org Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Hairy Willow-herb General Family: Evening Primrose (Onagraceae) Semi-aquatic herbaceous perennial Introduced from Europe as an ornamental Colorado List A - ERADICATION REQUIRED Common names Great willowherb, Codlins and cream Habitat Perennial forb Colony forming Found in wetlands, drainages, and rights-of-way Was sold as an ornamental in the past Very invasive PLANT Vegetation Mature plants up to 6 feet tall Leaves opposite and lanced-shaped with toothed edges- 1/2 inches wide and up to 4 inches long Stem erect and branched with soft hairs Roots Fibrous roots, rhizomes, and stolons Flower Pink or purple with white center and notched petals June - August ½-1 inch wide Seed White silky tuft in long seedpod Seedling Plants re-sprout from roots in the spring Reproduction Seed, rhizomes and stolons 700 Jefferson County Parkway, Ste 100, Golden, CO 80401 303-271-5989 www.jeffco.us/jcism Hairy willow-herb page 2 CONTROL BIOLOGICAL None CHEMICAL Stage Herbicide Timing Actively growing Aminopyralid (Milestone) Late spring - Summer Imazapyr (Habitat, Arsenal) through frost Glyphosate (Roundup, Rodeo, many others) CULTURAL Prevention MECHANICAL Stage Method Timing Burning N/A Grazing N/A Mowing Prior to flowering May help prevent seed development Spring Use all chemicals according to the manufacturer's label. No specific recommendation or endorsement is made or implied by listing the above methods or products. 12/2017 700 Jefferson County Parkway, Ste 100, Golden, CO 80401 303-271-5989 www.jeffco.us/jcism .

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