Ludwigia hexapetala or Uruguayan primrose willow is an invasive aquatic plant originally from South America. It is possible that this plant was introduced to this area when someone dumped the contents of a fresh-water aquarium into the ponds which contained a young live aquarium plant.
The City of Eugene has been controlling Ludwigia at Delta Ponds since 2009. Early efforts were experimental and consisted primarily of hand pulling aquatic plants. In 2013, the City applied for grant funding from the Oregon State Weed Board (OSWB) to assist with control efforts. Since then, the City of Eugene, in partnership with the OSWB, has been aggressively controlling Ludwigia using an integrated approach that utilizes a combination of hand pulling and careful spot spraying of shoreline plants with Salmon Safe-approved herbicide. The City has been able to reduce this invasive aquatic weed by over 90%, however control is an on-going effort to prevent Ludwigia from taking over again.
Join Eugene Outdoors for Pull and Paddle events where volunteers learn about, search for and pull aquatic invasive plants while paddling a canoe. No experience is necessary and volunteers are welcome to bring their own boat, but registration is required. Tools, gloves, instruction, snacks, canoes, life vests and paddles provided. See the calendar of events for upcoming volunteer opportunities.