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Biological controls for JAPANESE KNOTWEED coming soon.
Plant Images from: USDA, NRCS. 2008. The PLANTS Database (http://plants.usda.gov, 19 March 2008). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
JAPANESE KNOTWEED — Polygonum cuspidatum Sieb. & Zucc.
Polygonaceae — (Buckwheat family)
Perennial from long creeping rhizomes. Stems are stout, reddish-brown, 4 to 9 feet tall, woody but die back at end of growing season. The nodes are slightly swollen and surrounded by thin papery sheaths. Leaves are short-petioled, broadly ovate, 2 to 6 inches long and about two-thirds as wide, narrowed to a point. The flowers are greenish white to cream, borne in large plume-like clusters at ends of stems and in leaf axils. The fruit is 3-sided, black and shiny.
Introduced from Asia as an ornamental, now escaped to become a weed of roadsides, waste areas, ditchbanks, and pastures.
Non-standard name: fleeceflower
(Courtesy of Weeds of the West)
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