Creeping Water Primrose
Creeping water primrose, Ludwigia peploides, is a emergent (shoreline) aquatic weed. Vegetation can grow both in shallow water, and along shorelines in wet areas. Primrose produces stems up to 3 feet tall. Vegetation can creep along the surface of the pond. Stems start along the shoreline and can stretch up to 15 feet across the surface of the pond! Leaves are oval to sword shaped with defined vein lines. Produces small flowers with 5 petals each.
Water primrose is found in calm water and wet areas. It most commonly spreads through stem fragmentation.
Water primrose is not a desired aquatic weed. It's an aggressive spreader and out-competes desired native shoreline vegetation. The floating mats created by creeping water primrose provide an excellent breeding ground for mosquitos.
There are currently no natural control methods for managing water primrose. Physical removal is not recommended because any fragments left behind will produce new growth. Roots and seeds will also produce new growth.
For mature weeds (flowering), spray vegetation directly with CattPlex, glyphosate. This is absorbed down to the roots. CattPlex has no water use restrictions, and is safe for fish.
Propeller is another treatment option for treating larger areas. Propeller's active ingredient is flumioxazin and comes in granular form. The granules are mixed with water in tank sprayer and sprayed in areas where vegetation is actively growing.