Horned Pondweed

Horned pondweed has long, linear, thread-like leaves, resembling an underwater grass. The leaves are arranged in whorls on slender branching stems and taper to a point. It has tendril-like roots and slender rhizomes (underwater stems). It get its name from the horn-shaped seeds and thrives in the summer months.


  • 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.


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

Similar or Related Plants

It is frequently misidentified as Hydrilla .