Juncus acutiflorus × articulatus, commonly known as Sharp-flowered Rush or Jointed Rush, is a hybrid perennial herb that typically inhabits wetlands, marshes, and the edges of ponds and streams. It is a cross between Juncus acutiflorus and Juncus articulatus, both of which are adapted to moist environments. This rush can reach a height of 1.5-2.5 feet (0.46-0.8 meters) and is characterized by its upright, tufted growth habit. The flowers are small, brown, and generally inconspicuous, blooming in the summer. While not showy, the flowers are of ecological importance as they provide habitat and food for various insects.

Sharp-flowered Rush is valued for its ability to thrive in wet conditions and is often used in rain gardens, wetland restoration projects, and as a natural method for water filtration. It is also suitable for ornamental water features in gardens. This rush prefers full sun to part shade and grows best in medium to slow-draining clay or loam soils that are consistently moist or wet. It is relatively low maintenance, but gardeners should ensure that the soil does not dry out. While generally disease-free, it can be susceptible to rust if grown in conditions that are too dry.CC BY-SA 4.0