Japanese Knotweed, Mexican Bamboo, Reynoutria
Scientific Name: Polygonum cuspidatum Sieb. & Zucc.
Synonym: Fallopia japonica, Pleuropterus cuspidatus, Pleuropterus zuccarinii, Polygonum japonicum, Polygonum zuccarinii, Reynoutria japonica
Family: Polygonaceae
Pleuropterus zuccarinii, Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 676. Courtesy of Kentucky Native Plant Society.
Sunset®: All zones
Sun Exposure: Full sun
Origin: Japan, naturalized in parts of the USA.
Growth Habits: Shrub, 4 to 8 feet tall (1.2 to 2.4 m); spreading rhizomes; heart shaped leaves, 4 to 6 inches long (10-15 cm)
Watering Needs: Low to regular water
Propagation: Cuttings, rhizome cuttings, seeds, can be invasive in a garden
Extremely invasive, classified as noxious weed in California, Oregon, Washington.
Blooming Habits:
Dioecious. Minute whitish flowers in late summer, borne in attractive open panicles, followed, on the female plants by brown, shiny, triangular achenes, about 0.12 inch long (3 mm).
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