Hydrocharis morsus-ranae, commonly known as European frogbit, is a free-floating perennial herb native to still or slow-moving freshwater habitats such as ponds, marshes, and ditches in the central and southeastern United States. It is often mistaken for Hydrocharis spongia, which is a misnomer for the European species. The plant forms dense mats of rounded, heart-shaped leaves that float on the surface of the water, with roots that dangle freely, unattached to the substrate. During the summer months, it produces small, showy white flowers with yellow centers, each lasting only a few days. European frogbit is valued for its use in water gardens and ponds for its ornamental flowers and as a cover for aquatic wildlife.

European frogbit is well-suited for water gardens and ponds, providing habitat for fish and other aquatic creatures while also helping to reduce algae growth by shading the water. It prefers full sun to part shade and thrives in still or slow-moving water bodies. While it can grow in a range of water types, it does best in nutrient-rich conditions. Care should be taken when introducing this plant to new areas, as it can become invasive, outcompeting native species and clogging waterways. It is banned in some regions due to its invasive potential.CC BY-SA 4.0