Potamogeton crispus, commonly known as curly-leaf pondweed, is an aquatic perennial herb native to Eurasia, including regions in Asia, Africa, Australia, and Europe. It is typically found in standing and slowly-flowing calcareous waters such as lakes, ponds, and slow-moving rivers. The plant can grow up to a meter in length, and its submerged leaves are bright green to brownish with distinctive wavy edges and finely serrated margins. Curly-leaf pondweed is most recognizable by its crispate leaves, which remain green throughout the winter, providing a valuable habitat for aquatic life.

Curly-leaf pondweed is valued for its ability to oxygenate water and provide cover for fish and other aquatic organisms. It is often used in water gardens and artificial ponds for its aesthetic appeal and ecological benefits. However, it requires careful management due to its invasive potential outside its native range. In cultivation, it prefers full sun to part shade conditions and thrives in calcareous, nutrient-rich waters. While it can be beneficial in controlled environments, Potamogeton crispus can become problematic, forming dense mats that can impede water flow and outcompete native vegetation. Gardeners should be aware of local regulations regarding its cultivation and control measures to prevent its spread.CC BY-SA 4.0