Gahnia filum

Gahnia filum, or Chaffy Saw-sedge, is a hardy, clump-forming perennial sedge in the family Cyperaceae, native to southern Australia. Commonly found in saline wetlands, coastal areas, and seasonally waterlogged soils, it thrives in challenging environments and plays a crucial role in supporting wetland ecosystems. Growing up to 1.2 meters tall, this sedge features long, in-rolled, dark green leaves with a coarse, saw-like texture, and tall flower spikes that bear attractive spikelets ranging from yellow to dark brown. These spikes produce small, dark brown seeds, adding structural interest and subtle seasonal beauty to both natural and designed landscapes.

Chaffy Saw-sedge is particularly well-suited for saline and waterlogged conditions, tolerating full sun to partial shade. It is often found in the higher zones and ridges of saltmarshes and wetlands, where its strong salt tolerance allows it to thrive. Its dense foliage provides valuable shelter for small birds and insects, while its seeds offer an important food source for wildlife, contributing to local biodiversity. Additionally, it serves as a critical habitat for skipper butterflies, which lay their eggs on the plant; the emerging caterpillars feed on its leaves, making it a key species for supporting pollinator life cycles.

With its adaptability to difficult conditions, ecological contributions, and low-maintenance requirements, Gahnia filum is an excellent choice for wetland rehabilitation, salt marsh restoration, erosion control, and biodiversity-focused landscaping projects