Floating Leaf Pondweed


Ecological Importance

Floating leaf pondweed provides valuable grazing for ducks and geese late in the growing season. Muskrat, beaver, deer and moose will all consume portions of floating leave pondweed. Because of the shade and foraging opportunities, it produces floating leaf pondweed in considered good fish habitat.


Dense populations of plants reduce the water temperature and oxygen concentrations when plants die in late summer. Floating Leaf Pondweed may form dense mats blocking sunlight for other submersed vegetation along with interfering with fishing, boating and swimming.

Plant Description

Leaves both floating and submersed. Submersed leaves are long and narrow. Floating leaves are oblong and slightly heart-shaped at base. Parallel leaf veins are evident. Stems occasionally branched. Leaves are alternately arranged on stem. Solid, tightly packed spike of nutlets at tip of weed rises above water surface.

Hints to Identify

Floating leaves are slightly heart-shaped.

Common Application Questions

Q.How much should I treat?

A. Spot treat as needed to maintain navigation channels and swimming areas. Remember this plant is very beneficial and should not be treated where it is not a nuisance.

Q. When is the best time to treat?

A. Once water temperatures are around sixty degrees or warmer however this plant responds equally well to herbicide treatment when mature.

Q. How often do I need to treat Floating Leaf Pondweed?

A. One treatment per season is usually enough.

Q. How long before I see results?

A. Generally within two to three weeks things will be cleared up.


Homeowner Treatment Options
Aquathol K
Aquathol Super K
Hydrothol Granular
Sonar AS
Sonar RTU
*Aquatic Biologists recommends implementing preventative management techniques and physical removal prior to, or in conjunction with treatment.