If you have a pond on your property, improve its appearance by adding flowering, floating pond plants. Many floating pond plants are tropical in origin and will not survive winter in temperate zones. They can be overwintered in pots in a frost-free area. Check with your local county extension agent to determine what varieties of floating plants are considered invasive in your area.
A tropical floating pond plant, water poppy (Hydrocleys nymphoides) bears light yellow flowers that are 2 to 2 1/2 inches across. Although the flowers are short-lived, they are borne in abundance and hold themselves above the surface of the water. Plant in tubs that are sunk to the bottom of shallow water about 6 inches deep, but water poppy will survive in water up to 15 inches deep.
Giant Water Lily
Famous as a resting place for frogs in children's fairy tales, the giant water lily (Victoria amazonica) grows yellowish green leaves that are up to 6 feet across. Sharp spines grow on its stems and the undersides of the leaves, which are purple. The night-blooming, highly fragrant flowers are 9 to 12 inches across. They open white, turn to pink on their second day and purplish red on their third and final day.
Hardy in USDA hardiness zones 5 through 10, floating heart (Nymphoides pelatum) bears short-lived papery yellow flowers. The leaves are round, glossy and medium green with slightly serrated edges. It can be invasive, so plant floating heart in tubs and submerge them in 1 to 2 feet of water. Grows best in full sun.