Japanese Knotweed (Reynoutria japonica)
Japanese knotweed is a fast-growing perennial plant native to East Asia. It was introduced to North America in the 1800s as an ornamental and erosion-control plant. Today, it is considered one of the most damaging terrestrial invasive plants in the northeastern U.S.
Knotweed spreads through extensive underground rhizomes, which can penetrate pavement, building foundations, and flood-control structures. Along rivers, creeks, and lakefronts, it quickly forms dense thickets that outcompete native vegetation. These thickets provide poor habitat for wildlife and leave the soil bare and vulnerable to erosion during winter dieback. Erosion increases sedimentation in nearby water bodies, degrading water quality and fish habitat.
Japanese knotweed has been observed in areas surrounding Chazy Lake, particularly near road crossings and streambanks. Once established, it is notoriously difficult to remove and manual removal often stimulates further growth, and full root removal is rarely feasible.
Knotweed spreads through extensive underground rhizomes, which can penetrate pavement, building foundations, and flood-control structures. Along rivers, creeks, and lakefronts, it quickly forms dense thickets that outcompete native vegetation. These thickets provide poor habitat for wildlife and leave the soil bare and vulnerable to erosion during winter dieback. Erosion increases sedimentation in nearby water bodies, degrading water quality and fish habitat.
Japanese knotweed has been observed in areas surrounding Chazy Lake, particularly near road crossings and streambanks. Once established, it is notoriously difficult to remove and manual removal often stimulates further growth, and full root removal is rarely feasible.