Gahnia; after Henricus Gahn, a Swedish botanist. Sieberiana; after Franz Sieber, an Austrian botanist. The common name “saw sedge” refers to the rough edges of the leaves.

G. sieberiana is one of the most commonly seen members of the genus usually found in damp areas or in areas subject to periodic innundation.

Froms very large clumps 1.5 to 2 metres in diameter with flowering stems reaching 3 metres. The flowers occur in spring and summer at the ends of the stems in long clusters (pannicles) and are black in colour. The flowers are followed by shiny, red-brown seeds about 40 mm long.

Propagation can be carried out by division of established clumps. Most species of Gahnia are difficult to propagate from seed but G.sieberiana is easier than most although germination can be unreliable.

Very common in the swampy areas of the Moreton Bay islands, e.g., North Stradbroke Island.

Photo: Robert Whyte