I just posted this but I will do it here also.
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We are in a drought in east central Indiana and the water in my pond has dropped more at this time of year then it ever has in the last 15 years. My spiral ell grass is starting to come out of the water on bare ground as the water retreats. Since it cost a dollar a plant with shipping last year I hate to see any of it die even though it has spread well. So I transplant it by taking a long handled spade and take a shallow shovel full of ell grass and place it out in deeper water by setting the spade on the bottom and scooting the shovel back and forth. The grass slips off the shovel and settles on the bottom with no transplant shock. Thought I would mention this if anyone else has spiral ell grass in these drought conditions.
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MOHELLO I'm pretty sure the plant is American Elodea. Place a dime next to it and if the dime is as wide as the outside leaves, that is most likely what it is. I had some show up in my pond and I though I would like it, but now I don't. It is too thick and layes on top of the pond. esshup said I wouldn't like it and he is right. Right now I have a 10 foot dia. of it but some spatterdock is growing up through it so it will be interesting to see which plant can out compete each other. My frogs and turtles love it. They set in and on top if it everyday. If my GC don't control it in the long run I will have to do some spot control.
Bill, FULLCIRCLE, the spiral ell grass is doing great. It is green and thick and the orginal 100 plants has become tens of thousands. It looks like a perfect pond plant.