I have heard alot about Chufa in the last few years for ducks. It was originally a major turkey food plot seed but has become well known for duck hunting also. I have included the following link, and from what I understand is duck hunters have good luck planting in the late spring in low water levels (area's where the pond has dried up) and then come fall when the water level rises, the plants become sumerged and the ducks go crazy!
www.tn.gov/twra/pdfs/chufa.pdfGood luck...Ryan
