LEARNING CENTER
Ask the Pond Guy

Get the latest expert tips and advice

American Pondweed

Description

American Pondweed is a perennial plant that has both floating and a few submerged leaves in an alternate pattern. The floating leaves are elliptical to oval 4 to 7 inches long and 1 to 2 inches wide on long petioles. Submerged leaves are not abundant and are blade-like, somewhat transparent and smaller than floating leaves. American Pondweed's fruits are on spikes that often stand above the water's surface and are brownish to reddish in color, 2 to 3 inches long and 1/8 to 1/4 inches wide.

Mechanical Control

American Pondweed can be removed by cutting and raking from the pond. It will regrow from remaining roots and seeds.


Pond Dye can be used to limit sunlight into the pond. With reduced sunlight, photosynthesis cannot occur so growth will be stunted.

Chemical Control

There are several options to control American Pondweed.

  1. Use a season long herbicide such as Sonar™ A.S.. One treatment treats duckweed and many other common pond weeds for the season.
  2. Use a broad spectrum contact herbicide, such as Ultra PondWeed Defense®, will quickly kill duckweed. Because it does not stay in the water body, multiple treatments may be needed throughout the season.
  3. Use Clipper™, a fast and selective herbicide that controls tough invasive and nuisance aquatic plants.

Chemical Application Best Practices

Anytime you use chemicals treat weeds or alagae, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time, if the weather is hot, only treat 1/4-1/3 of your pond. Wait 10-14 days between treatments.
  • Once the weeds have browned, use a rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Treat your pond with the proactive approach to pond management. Use PondClear™, MuckAway™ and Pond Dye to keep your pond looking great.

PRODUCTS