When adding pond plants to your fish pond or duck pond, it is important to take note of not only the size of your fish or ducks at maturity, but also the efficiency with which your pond plants are able to clean nutrients from the pond water, the aesthetic value of the plants, and choosing plants that are multi-functional. Pond plants range from flowering plants to plants that produce ornamental or edible leaves, plants that are only edible to fish or ducks, and can include trees, shrubs, and ground covers.