Rumex orbiculatus, commonly known as Great Water Dock, is a robust perennial herb native to freshwater marshes, swamps, and the edges of ponds and streams in the eastern United States. It can grow up to 6 feet in height and is characterized by its large, round-leafed foliage, which can be quite striking in a wetland planting. The plant produces reddish-brown flower spikes that appear from June to August, although the flowers are not particularly showy. The foliage, however, adds a lush, green backdrop in water garden settings.

Great Water Dock is valued for its ability to thrive in wet, boggy soils, making it suitable for water gardens, rain gardens, and naturalized wetland areas. It prefers full sun to part shade and consistently moist to wet soil conditions. While it is not typically grown for its flowers, its large leaves provide textural contrast in water-related plantings. Gardeners should be cautious, as Rumex orbiculatus can spread aggressively by seed and may become problematic if not managed. It is also important to note that the plant can accumulate high levels of oxalic acid, which can be toxic if ingested in large quantities.CC BY-SA 4.0