The Water Lily, nymphaea spp, is a network of rhizomes that produce large round leaves that float at the pond surface. Lily pads are 6-12" in diameter. Water Lilies produce multiple flower colors including white, yellow, and pink. They spread by both their rhizome, and the seeds that they produce.
Water lilies can spread rapidly through a pond. They can grow easily in 6-7 feet of water. The network of rhizomes can make it difficult to manage. An example of a water lily rhizome is pictured above. One rhizome can produce 15 feet of surface cover in just 5 years.
Water lilies create habitat that largemouth bass prefer to spawn. Lily pads also create an area for young fish to live. Areas covered in lilies are less likely to have algae blooms because the surface coverage blocks sunlight needed by algae.
If left unmanaged lilies can also have some detrimental effects. Extensive lily cover can reduce the exchange of oxygen at the water surface. This oxygen is vital to all aquatic life. Water lilies also attract mosquitoes and aphids.
Water Lilies can be cleared with weed rakes and cutters. This is a short-term management option because the lilies grow from rooted rhizomes in the soil. These rhizomes can produce new shoots if left in the pond.
Chemical Treatment Options
For early season control apply Navigate granular aquatic herbicide. Granules sink to the bottom and kill watershield at the roots. Begin noticing results in 7-10 days.
CattPlex can be applied to mature vegetation that is above the water surface. CattPlex is a liquid aquatic herbicide that is applied by tank sprayer. All lily pads must be sprayed for good results. Begin noticing results in 7-10 days.