The marginals role is purely ornamental as they do not play a vital part in maintaining a satisfactory balance in the pond. They serve two functions. The boundary between the water and the pond side is softened which is often desirable in a formal pond and always essential in an informal pond. They also provide floral color or interesting leaves during the growing season. Many types are available. The recommended planting depth is 0″ – 6″ depending upon the variety. Their home is on the marginal shelf or in the shallows of the ponds. The traditional method of growing them is to plant them in soil at the bottom of the shelf, but it is better to set them in baskets with soil. Do not mix different plant varieties or multiple plants in a single container as they tend to grow very fast. Marginals are easily divided and will last several years.