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Bone Lake Protection: Invasive Species:

Japanese Knotweed

Japanese Knotweed is present around Bone Lake. A number of colonies are established in Polk County; some colonies are being treated to eradicate them.

Watch for Japanese Knotweed in wild areas, especially along watercourses, and report any sightings. In Polk County, call LWRD at 715-485-8699. To report infestations outside Polk County visit http://dnr.wi.gov/invasives/futureplants and click “How you can help” to download a reporting form.

Japanese knotweed, in the buckwheat family, is a perennial that grows to heights of 5-10 feet in large clones up to several acres in size. The arching stems are hollow and bamboo-like, a reddish-brown to tan color; they die, but remain upright through the winter. Mature leaves are 3-5” wide and 4-9” long, lighter on the lower surface, and egg to spade shaped; young leaves are heart-shaped. Lacy 2 inch long clusters of tiny greenish-white flowers are produced in late summer and held upright at the leaf base. Japanese knotweed reproduces occasionally by seed, but spreads primarily by extensive networks of underground rhizomes, which can reach 6 feet deep, 60 feet long, and become strong enough to damage pavement and penetrate building foundations and septic tanks. More information


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