Ensure that the pond's water is at least 65 degrees Fahrenheit before planting the lotus tuber.
Fill a 13-inch by 9-inch tub with 4 inches of clay soil. If clay soil is not available, use cat litter that has no deodorant or clumping qualities.
Place the tuber horizontally on top of the soil so that the "eye," points up. Cover the tuber with stones, leaving the eye exposed, so that it doesn't float out of the soil when placed in the water. Cover the tuber, not the eye, with soil.
Insert pond fertilizer tablets into the soil at both ends of the tub. Push the tablets to the bottom of the pan. Pour 2 inches of pea gravel over the soil.
Place the tub into the pond to a depth of 3 inches. Increase the depth 2 inches every three days.