Illinois Pondweed

Illinois pondweed is very similar to American pondweed and can be easily confused. The thin, oval-shaped leaves are submersed, float on the surface of the water, and are attached to a long stem. Leaves can grow up to 8 inches in length.

Also known as: American pondweed, floating-leaf pondweed


  • 1

    Recreational activities such as swimming, fishing, and boating can be impaired and even prevented.

  • 2

    Dense mats of Aquatic weeds can block sunlight from native submerged plants.

  • 3

    Aquatic weeds greatly detract from the aesthetic appeal of a body of water.

  • 4

    Excessive growth can lead to fish stunting and overpopulation. This occurs because the production of too much habitat prevents effective feeding of small fish by larger fish.

  • 5

    Aquatic weeds can cause fish kills.

  • 6

    Aquatic weed growth provides quiet water areas ideal for mosquito breeding.

  • 7

    Weeds impede water flow in drainage ditches, irrigation canals, and culverts and cause water to back up.


Illinois Pondweed can be found in most of the contiguous states.

Similar or Related Plants

It is frequently misidentified as American Pondweed .