Narrowleaf Bittercress

General Information on Invasive Species

In 2008, during a routine plant survey, Fortin Consulting discovered and reported the first infestation of narrowleaf bittercress in Minnesota. Because of its unusual and sudden appearance it was identified and determined an invasive plant, but one not yet documented in Minnesota. Since the initial discovery of narrowleaf bittercress at Riverside Park, it has continued to spread throughout the park, and has been reported in several other natural areas along the Mississippi River. Since 2009, efforts to control the plant in Riverside Park have been ongoing, including hand-pulling events and herbicide treatments. Though this plant has been well documented in eastern U.S., a thorough defense against its spread is unclear. Being that its discovery in Minnesota was within a managed woodland, great care and concern is being used to discourage its spread within the natural area. Fortin Consulting designed and implemented an herbicide experiment in the fall of 2010, to determine the most effective herbicide treatment for controlling narrowleaf bittercress. Management and research have been conducted in Riverside Park as funding allowed. Partners included National Park Service, City of St. Paul Park, Minnesota Department of Agriculture, Minnesota Department of Natural Resources, CPS-Timberland, and North American Prairie.

In 2012, narrowleaf bittercress was put on the control list as a Prohibited Noxious Weed in Minnesota.

Narrowleaf bittercress (Cardamine impatiens)

Hand-pulling narrowleaf bittercress