Add a one-inch layer of pea gravel on the surface. Before submersing the container, water it thoroughly and then place it in the pool. The gravel layer should be 3 or 4 inches below the water surface. As growth continues, the lotus plants can be moved to deeper water 6 to 12 inches in depth. But choose the site carefully.
Lotus is a very invasive plant.
In a few growing seasons it can spread rapidly and overtake a shallow pond. This column appears in the 1998 News Releases.