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Large leaf pondweed provides excellent habitat for pan fish,
largemouth bass, muskellunge, and northern pike; bluegills nest
near these plants and eat insects and other small animals found on
the leaves; walleyes use these pondweeds for cover.
Dense populations of plants reduce the water temperature
and oxygen concentrations when plants die in late summer.
Excessive growth of large leaf pondweed can also obstruct boat
motors, and can become a nuisance in recreational use of the
Large-leaf Pondweed has the broadest leaf (3.5-7 cm wide) of any
pondweed in our region. Submersed leaves are large, oblong, wavy
and taper to the steam. Floating leaves are
oval-shaped. These leaves are arched and slightly folded. The
leaf varies in length and is lined with many parallel
leaf veins (25-37). Leaves are alternately arranged on the
stem. Solid, tightly packed spike of nutlets at tip rises above the
Large-leaf Pondweed has larger leaves than Illinois
Pondweed and has more veins throughout the
A. Once water temperatures are around sixty degrees or warmer
and the plants are viable.
A. Controlled Largeleaf will not grow back the same season.
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