Primrose-Willow Ludwigia Play pronunciation

Ludwigia is a genus of over 80 species of mostly aquatic plants found in many temperate and tropical areas of the world, including North America, Central America, the West Indies, South America, Europe, Southeast Asia, Africa, Australia, and many islands of the Indian and Pacific Oceans. It is a member of the evening primrose family (Onagraceae). They are usually perennials, and rarely annuals. They are found in wet habitats, although some are almost or completely aquatic. They are often used as aquarium plants and have escaped into the wild. Plants of this genus often grow in bogs, ponds, and lakes, and some are considered noxious weeds as they can quickly take over a pond. Its yellow flowers open at dusk, have a long bloom season, and may appear solitary, paired, or in clusters, and produce many seeds. In some species, the stems can grow along the ground and root at the nodes, growing up to 9 feet. The leaves are cauline, usually alternate, and dark reddish-green. The genus name Ludwigia honors Christian Gottlieb Ludwig, a botanist and physician. 

Plants are fast-growing; however, depending on the species, their growth requirements may vary slightly. They prefer medium to bright sunlight to retain their vibrant leaf color; in low light, the leaves tend to be greener. If planted, the soil needs to be a nutrient-rich substrate. If allowed to float in the water, the stems are just below the water's surface. Liquid fertilizers help to encourage growth and enhance the leaf color. The pH should be slightly acidic to neutral, and temperatures should range between 72 and 82 degrees Fahrenheit. Prune as needed to maintain shape and control growth. The plant's hardiness is dependent on the species.  Propagated easily by stem cuttings or seeds. 

Depending on the species selected, they may be used in aquariums, in or along ponds and streams, or in outdoor water gardens. 

Insects, Diseases, and Other Plant Problems: No significant insect pests or diseases. Inadequate light and nutrients can cause loss of foliage color. This fast-growing plant can easily take over in an aquarium or pond. Prune regularly. Algae growth can also be problematic.