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Old 06-18-2009, 02:29 PM   #1
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Default Polygonum cuspidatum - Japanese Knotweed

Now you know about knotweed
By CHELSEA CONABOY Monitor staff
June 09, 2009 - 7:00 am

Concord Monitor - Now you know about knotweed
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JAPANESE KNOTWEED is replacing purple loosestrife as one of the most pervasive invasive species in the state. Knotweed came to the United States from Japan in the 1800s to be used mostly as a landscaping plant. It grows in thick clusters, similar to bamboo, and has no known predators here.

Unlike loosestrife, a pretty but insidious plant that can choke wetlands if left unchecked, there is no known biological means of controlling knotweed. For more than 10 years, the state has been battling loosestrife by shipping in a kind of beetle that eats the plant, weakening it and controlling its spread.
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"Do not mow it," he said.
Mowing along highways has largely contributed to the spread of the plant. Each plant has several hundred nodes, or joints. When the plant is chopped up by a lawnmower, each node can sprout into a new plant. Cygan said the state has stopped mowing areas of knotweed and is removing populations of the plant that occur in areas of road construction.
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Old 06-20-2009, 02:13 PM   #2
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Unfortunately, it's a problem in Wisconsin too.
Polygonum* cuspidatum: UW-Stevens Point Freckmann Herbarium: Plant Details Page
Invasive Plants of Wisconsin: Polygnoum cuspidatum, Japanese knotweed

This just drives me crazy "Landscape Plants of the Midwest":
Landscape Plants of the Upper Midwest: Low Japanese fleeceflower (Polygonum cuspidatum var. compactum (also listed as P. rynoutria))
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Old 07-09-2009, 05:27 AM   #3
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Default Polygonum cuspidatum

A problem here in Maryland as well. And here is an entrant in the Flora Hall of Shame photo contest:
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Old 10-31-2009, 11:47 AM   #4
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Japanese knotweed
Polygonum cuspidatum - Japanese Knotweed-dscf8597.jpg
in full bloom.
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