True, a pond covered with water lilies do look attractive, but if the river body gets completely covered, it will inhibit the growth of flora and fauna living deep inside. Plus, they have the tendency to propagate. In no time, you will see your pond covered with them. So to prevent such a situation –
1. Use Plastic Container or Baskets : Shallow and wide plastic containers that have holes punched inside.
2. Line the Periphery of the Container with Burlap : To retain the soil in the container, use a landscape fabric or a burlap else the soil would leach out and make the pond water murky.
3. Add Clay and Fertilizer : Fill the container with clay, silt or loam and mix it with the aquatic fertilizer.
4. Remove the Old Leaves : Before placing the plant, make sure you have removed the old, fleshy and thick roots and leaves.
5. Know the Right Placement : Plant the tuber at about 45° angle.
6. Keep the Soil Intact: Add pea gravel or rocks to the container to retain the soil in the pot. There are chances of the soil washing away from the planted pot.
7. Take Note of the Height : Now, leave the pot in the pond at a depth of around 18 inches. If required, raise its depth by placing the pot on the rocks. Ensure that the leaves float on the surface.