Appearance

The leaves of American pondweed are attached to a stem that can grow up to 6 feet long. Floating, oval-shaped leaves are 4 to 7 inches long and 1 to 2 inches wide, while the less abundant, submerged leaves are smaller and blade-like. Flowers emerge from the water in densely packed, club-like spikes. Seed heads are brownish red and extend above the water on slender stalks.

Predators

American pondweed is often a food source for fish, waterfowl and turtles. Because it is considered a nuisance species, it is eradicated by humans with herbicide. It is also susceptible to aphid infestation.

Reproduction and Life Cycle

Reproduction occurs through producing new shoots, fragmentation and seeds.

Did You Know?

• Although native to the Bay region, American pondweed is considered a threat to other native submerged aquatic vegetation because of its tendency to form dense mats that block the sunlight these plants need to grow. However, these dense mats are considered a good source of shelter and food for fish, diving ducks and invertebrates.

Sources and Additional Information

• Aquatic Pest Control by Patrick J. Marer and Kathy Keatley Garvey
• American Pondweed – San Jacinto River Authority
• American Pondweed – Texas A&M AgriLife Extension Service