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

Native Bee & Pollinator Landowner & Partner Workshop

August 4 @ 8:30 am - 4:00 pm

JDCF, in cooperation with the U.S. Fish & Wildlife Service, is hosting an informational workshop covering native bees in the Jo Daviess County area. Topics to be discussed include; native bee ecology and life history, sampling techniques and photography, and efforts to conserve native bees, including the federally endangered Rusty Patched Bumble Bee. Please join […] Read More

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Meteors on the Mound

August 11 @ 7:30 pm - 11:00 pm

Join JDCF and the Planetary Studies Foundation to catch a glimpse of the Perseid meteor shower from atop Horseshoe Mound on Saturday, August 11th from 7-11 PM. Enjoy family-friendly activities and learn about meteors before the sunset ushers in the celestial show! The event will be cancelled if it is raining, so please check jdcf.org […] Read More

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Fall Forest Hike

September 15 @ 1:00 pm - 3:00 pm

With fall on the way, the appearance of trees changes significantly and identifying them can be tricky – unless you know your bark, berries & nuts. Join us to celebrate the change of season with a Fall Forest Walk on Saturday, September 15th from 1:00- 3:00pm at the Schurmeier Teaching Forest. This free event will […] Read More

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Critters of the Night

October 20 @ 10:00 am - 12:00 pm

Join JDCF on Saturday, October 2oth at 10:00 AM to learn about some of our nocturnal friends, owls and bats. This program, geared towards a middle school grade level, introduces the life cycle of the owl and its food and habitat. It also identifies the characteristics that make the owl a perfect predator and member […] Read More

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