Japanese Knotweed: An Emerging Invasive Weed in Jo Daviess County

The stalk of Japanese Knotweed resembles bamboo. (c) www.eattheweeds.com.

JDCF staff has observed a new invasive weed, Japanese Knotweed (Fallopia japonica/Polygonum cuspidatum), around streams and drainage ditches in in the Galena area. Invasive species, often plants or animals arriving from other continents, have created huge challenges for land managers of conservation lands in NW Illinois. If left untreated, Japanese Knotweed could spread further around the county causing ecological and economic harm. JDCF staff would like to halt the spread of Japanese Knotweed by treating populations throughout the county with no cost to the landowner!  JDCF secured a grant from the National Fish and Wildlife Foundation to assist in this effort.

Japanese Knotweed was originally introduced to North America from Asia as an ornamental plant. Once established it spreads rapidly creating a density that out-competes native species reducing the health and wildlife habitat in forests, stream corridors, and wet prairies. Japanese Knotweed grows well in moist areas such as stream banks, roadsides, and floodplains. It can reach 3-10ft tall with large triangular to heart shaped leaves and multiple spikes of white flowers. The most identifiable characteristic is the thick jointed stem that is often a reddish purple color.  If you believe you have Japanese Knotweed on your property please contact JDCF at striketeam@nulljdcf.org or (815) 858-9100.

Upcoming Events

JDCF Nature Preserves ~ A Q&A with Our Executive Director

September 24 @ 10:00 am - 10:30 am

Join us Live on Facebook with our own Steve Barg who will discuss all things related to JDCF’s public preserves.  There are some misconceptions about our land preservation work in Jo Daviess County, IL.  Steve will be ready to answer all your questions!  Tune in to learn how the Foundation prioritizes land acquisitions, how these […] Read More

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Discover Wapello ~ A Discussion with Archaeologist Phil Millhouse, PhD

October 3 @ 10:30 am - 11:00 am

JDCF will be Live on Facebook with special guest and renowned archaeologist, Phil Millhouse, PhD, at the Wapello Land & Water Reserve, the site of his doctoral field work in 2005. Phil will talk about his initial findings, which contributed to Wapello being placed on the National Register of Historic Places due to its cultural […] Read More

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Meet the Members of GALE ~ A Facebook Live Event

October 15 @ 10:00 am - 10:30 am

We will be Live from the worksite at Horseshoe Mound with members of the Galena Area Land Enthusiasts (GALE), a volunteer group that has been helping our stewardship staff with field work since 2012.  This group of not-so-young guys and gals work year round in all weather conditions battling invasive species, assisting with prescribed burns, […] Read More

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