Another invasive species is being battled with in the PEI National Park. This time it is the Japanese Knotweed. From the article, it sounds like a lot of work, but covering the ground with tarps should kill it off. Hope so anyway...

Parks Canada is trying to kill off an invasive species called Japanese knotweed that's been growing near the Interpretive Centre in the Greenwich adjunct to P.E.I. National Park.

It's part of a park-wide program to preserve native plants. Park ecologist Phil MacKay said this is the first year of a monitoring program to weed out invasive species.

For the knotweed, staff are focusing on 20 areas.

"We'll cut down the plant to ground level, and cover the area with heavy, black plastic tarps," he said. "The tarps will control the plant and kill it off basically."

Invasive species fought in P.E.I. National Park
http://www.cbc.ca/canada/prince-edward-island/story/2010/09/08/pei-knotw...