Cook Forest Conservancy makes efforts to stop invasive plant in Clarion River Tuesday, May 10 by Louise BennettCooksburg –The Cook Forest Conservancy is coordinating efforts to keep the banks of the Clarion River clear of Japanese Knotweed, an invasive nonnative plant.Japanese Knotweed spreads aggressively and degrades water quality while it out-competes native plants that would filter water, limit erosion, and provide... Read More.