be forewarned, raccoons like water hyacinth too... but some might consider raccoons a yield of you pond as well ;) I haven't tried it
but I just read yesterday that the common speedwell (Veronica americana) is a delicacy to some (Schofield, 1989) and grows like a weed.http://www.msuturfweeds.net/details/_/creeping_speedwell_2/
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