The recommendation is to have a minimum of 40 to 50 percent of the surface area of your pond covered with plants. This can be accomplished with shallow bog plants, water lilies, floating plants, or any combination thereof. This plant cover helps shade the water, keeping it cool for the fish and slowing the growth of algae. In addition, the coverage of plants provides the fish with a safe place to hide from predators. Additionally, plants make it possible to blend your pond in with existing landscaping.