Biology and Management of Knotweeds in Oregon: A Guide for Gardeners and Small-Acreage Landowners

Robert Emanuel, Andy Hulting and Rebecca Koepke-Hill
EM 9031 | Published June 2011, Reviewed 2019


Woody knotweeds are listed as noxious weeds throughout most of the United States. This publication briefly describes the characteristics and biology of four species of woody knotweeds and summarizes management and control options. Intended for home gardeners and small-acreage landowners.

About the authors

Robert Emanuel
Water resources and community development specialist
Oregon Sea Grant Extension, Tillamook and Clatsop counties
Rebecca Koepke-Hill
Faculty research assistant
Deparment of Crop and Soil Sciences, Oregon State University

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