Lowly, you might want to research that one some more, especially before planting it in a natural water source. Look at all the money spent over the years on trying to control Asian millefoil and purple loosestrife (and buckthorn and ...). The USDA and other sites list water spinach as a federal noxious weed and specifically call it out as an example of an invasive that is "damaging our agricultural resources." If you feel a need to try growing it, it's probably a better candidate for growing in a pot on a concrete patio where you can control seed production and vegetative propagation.
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Bitterwort
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