Triglochin procera (content)

Triglochin procera, commonly known as Water Ribbons or by the Aboriginal name Nanu, is a perennial aquatic herb native to Australia, widely distributed across all states and territories. This plant is a member of the Juncaginaceae family and is distinguished by its adaptability to various freshwater environments. It typically grows in swamps, ponds, lakes, slow-moving streams, and ditches, often in shallow water or on water-saturated muddy substrates.

The plant is characterised by its long, ribbon-like, bright green leaves, which can reach considerable lengths, sometimes exceeding one meter. These leaves are robust and float on the water surface or are submerged, forming dense patches. T. procera propagates mainly through fleshy rhizomes and underground tubers, which allow it to form colonies rapidly.

The flowers of the Triglochin procera are inconspicuous and small, greenish-yellow in color, and are borne on an erect stalk (scape) that emerges from the water. These floral scapes can rise up to 1.5 meters in height. Flowering occurs mainly during the warmer months. The flowers are followed by small, dry fruits (capsules), which contain the seeds. Dispersal occurs partly via water.

Ecological Importance and Uses of the Triglochin procera:

1. Ecological Value: Triglochin procera plays a crucial role in aquatic ecosystems. Its dense leaf masses provide shelter and foraging sites for fish, amphibians, and aquatic invertebrates. Furthermore, it helps stabilise the edges of water bodies and filters excess nutrients, improving water quality.
2. Traditional Aboriginal Use: For Indigenous Australian populations, T. procera was (and in some communities still is) a food resource of great importance. The fleshy rhizomes and tubers, in particular, were highly prized for their starchy, potato-like flavour. They were harvested, peeled, and eaten raw or roasted. This traditional use earned it the common name Nanu in some regions. Young leaf bases were sometimes consumed as a vegetable.
3. Ornamental and Remediation Use: Due to its rapid growth and ability to form dense cover, T. procera is increasingly used in phytoremediation projects and in the revegetation of constructed or restored wetlands. It is considered an ideal plant for bank stabilisation and the creation of functional aquatic habitats in water gardens or stormwater management systems (WSUD).

Wetland zoning: 3B – Shallow / Deep Marsh

Plant type: 8 – Aquatic herbaceous