Gahnia aspera

Gahnia Red Cedar Flat - Royal National Park

Gahnia aspera, commonly known as the rough saw-sedge or cutting grass, is a species of flowering plant in the sedge family (Cyperaceae). This perennial plant is native to various regions, including Australia, where it is found in a range of habitats from coastal areas to mountainous regions. Gahnia aspera is notable for its tall, sharp-edged leaves and its role in the ecosystem as a habitat for various species of wildlife.

Description

Gahnia aspera grows as a large tussock-forming sedge, reaching heights of up to 2 meters. Its leaves are long, narrow, and have a distinctly rough, serrated edge, which can easily cut skin, hence the common name "cutting grass". The plant produces dark brown to black flower spikes on tall stems above the foliage, which are followed by small, round seeds. The flowering period occurs in spring and summer.

Habitat and Distribution

Gahnia aspera is widely distributed across Australia, including Tasmania, Victoria, New South Wales, and Queensland. It thrives in a variety of environments from sea level to alpine areas, often found in wetlands, along stream banks, and in open forest understories. Its adaptability to different soil types and conditions makes it a common species in its native range.

Ecological Role

The dense tussocks of Gahnia aspera provide shelter and nesting sites for a variety of wildlife, including birds and small mammals. The seeds are a food source for some bird species. Additionally, the plant plays a significant role in soil stabilization, particularly in riparian zones, helping to prevent erosion along waterways.

Cultivation and Uses

While not commonly cultivated in gardens due to its sharp leaves, Gahnia aspera is sometimes used in landscaping for habitat restoration projects and erosion control due to its robust nature and ecological benefits. Care should be taken when handling the plant because of its serrated leaf edges.

Conservation

Currently, there are no major threats to Gahnia aspera, and it is not listed on any conservation status. Its widespread distribution and adaptability to various environments contribute to its stable population in the wild.

See Also

• Cyperaceae
• Flora of Australia
• Erosion control
• Habitat restoration