Previous species
Previous Species

Next Species
Next Species

Home Page

Order CD-ROMs from the site

Tell a Friend

Gardening Books

Gardening Catalogs


Japanese Knotweed, Mexican Bamboo, Reynoutria
Scientific Name: Polygonum cuspidatum Sieb. & Zucc.
Synonym: Fallopia japonica, Pleuropterus zuccarinii, Polygonum zuccarinii, Pleuropterus cuspidatus, Polygonum japonicum, Reynoutria japonica
Family: Polygonaceae
Japanese Knotweed, Mexican Bamboo, Reynoutria (Polygonum  cuspidatum)
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.
Recommended Temperature Zone:
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).

Fruiting Habits:

Sponsors: Michigan Bulb - 120 x 60 Lawns Banner! Gurney's 120 x 60 A

We do get a small commission out of these sponsors that helps financing the website.  Let us know if you are satisfied or dissatisfied of their services, since obviously we are trying to advertise only for reputable garden supply companies.  They might be helpful to get plants not generally available at the local garden center, getting a new and unusual gardening tool or get a discount Better Homes and Gardens magazine subscription.


Desert Tropicals Home Page | List of All the Plants | More in the Polygonaceae family | Tell your friends about this page

Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

1998-2005 Philippe Faucon, All Rights Reserved.