water hyacinth

Multi-Year Partnership Results in Water Hyacinth No Longer Seen on Lake Winneconne

A team from the Fox-Wolf Watershed Alliance and the Wisconsin Department of Natural Resources recently monitored Lake Winneconne for the invasive species Water Hyacinth. The annual check for this invasive plant has been ongoing since October 2015 when water hyacinth was first found in the Winnebago System. After an extensive search, no hyacinth was found for the 5th consecutive year! According to the DNR, water hyacinth will no longer be listed as verified or observed on the System. While it’s very difficult to remove any invasive species completely from a lake or river, that has effectively been done for the Winnebago System with water hyacinth!

Water hyacinth has previously been found in local waterways in 8 Wisconsin counties, including in Lake Winneconne in Winnebago County. The plant was first reported to the DNR in October 2015 by a citizen volunteer. Due to its ability to quickly dominate a system, there is concern that the plant may be able to establish a population in the lake. With local partners, the DNR coordinated efforts in October and early November 2015 to remove all water hyacinth plants that were found. As a sub-tropical plant, there was hope that the cold Wisconsin winter would eliminate any plants that were potentially missed by the removal efforts. However, in September 2016, more water hyacinth plants were located in the same area of Lake Winneconne in residential channels and the Wolf River channel. Additional monitoring and removal occurred in September and October 2016, September and October 2017, July and October 2018, and September 2019.

Starting in 2020, no water hyacinth was found during the monitoring trips or by volunteer monitoring efforts. With each successive year, more support was given to the idea that the plant was being repetitively illegally released into the lake near the end of the growing season rather than fragments of plant surviving or seeds germinating each year.

Only with partnerships between WI DNR, local non-profits like Fox-Wolf Watershed Alliance, citizen volunteers is this story a success. From the first plant being found and reported by a concerned lake resident to the response and removal efforts, we at Fox-Wolf are proud to be part of the team that ensured our System remains free of waterd hyacinth!