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American Pondweed has submersed and floating leaves that are oval shaped. There are several other similar plants with floating leaves like Illinois, Floating and Waterthread Pondweeds. These plants are common and widespread throughout the United States.
Once water temperatures are around sixty degrees or warmer and the plants are viable.
Granular herbicides can be spread by a small Hand held spreader or can be tossed by a hand scoop.
Generally, there is little regrowth within the same season. Note that some aquatic species like the Naiad family grow later in the season that may require a mid to later season treatment to achieve season long clear water.
Generally within two weeks things will be cleared up.