Juncus kraussii (sea rush) is primarily found in coastal areas, especially the margins of salt marshes, brackish streams, lagoon and river margins, and estuaries. Can also be found at the headwaters of the Rangitata River and around geothermal vents in the North Island. A native to Australia, South Africa, and New Zealand. Juncus krausii is found throughout the North, South and Chatham Islands down to Dunedin.
Juncus kraussii is salt tolerant and favours a damp environment, able to grow in a range of soils from sand to alluvium. Dark green fine-leaved rush suitable for damp and wet places. An attractive species ideal in rock gardens and one that should be used more widely in coastal plantings. It forms open clumps up to 1.2 m tall, with black or dark brown fan-shaped flower heads.
This species is ideal as a stabiliser in estuary banks and riparian zones that adjoin developed areas; it prevents erosion. It is commonly used today for stabilisation of the banks of estuaries, around salt marshes and riparian zones next to sites developed for human use. It is also used in biofiltration systems and rain gardens with Ficinia nodosa and Apodasmia similis.