Summary
Being able to correctly identify the five knotweeds that grow in the Northwest can help you choose the best control strategies. Color photographs of the weeds accompany a detailed chart describing the stems, leaves, and flowers of Japanese, giant, Bohemian, and Himalayan knotweeds and low Japanese fleeceflower. Management strategies discussed include cultural, mechanical, and biological control methods as well as the use of herbicides.
© 2009 Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the Oregon State University Extension Service, Washington State University Extension, University of Idaho Extension and the U.S. Department of Agriculture cooperating. The three participating Extension services offer educational programs, activities and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/ parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)