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Title: Japenese Knotweed (Pest Alert)

Author: USDA Forest Service,;

Date: 1999

Source: NA-PR-04-99. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry

Publication Series: Program Aid

Description: Japanese knotweed is native to Eastern Asia, and is one of the first plants to appear on volcano slopes after volcanic activity. It was introduced to the United Kingdom as an ornamental in 1825, and from there to North America in the 19th Century. It appears to require high-light habitats, and does very well along roadways and rivers. It reproduces by seed and large rhizomes, which may reach a length of 40 to 60 feet. A small piece of rhizome can float down a river and begin to grow once it is deposited on land. These buried rhizomes have grown through 2 inches of asphalt!

Keywords: Invasive species, nonnative.

Publication Notes:

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USDA Forest Service 1999. Japenese Knotweed (Pest Alert). NA-PR-04-99. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry


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