Gahnia sieberiana

(Saw-sedge)

If a large and robust tussock plant is what you're after, then look no further than this one. But not only is it a large plant, it also bears tall flowering stems with black plume-like flowers which look very dramatic; especially with the right backdrop.

It's one of the largest of several species of Gahnia, growing leaves up to 1.5 metres in length and flowering stems that can grow to 3 metres. Flowering takes place during summer but the plumes linger beyond seed set.

Gahnia sieberiana can be found in all states except Northern Territory, and even in Papua New Guinea and New Caledonia.

It's not only a vigorous grower, it's also an important food source and habitat plant. It's a host plant for the Sword Grass Brown butterfly, and is habitat for several insect and bird species.

Aboriginal people ground and ate the seeds.

Propagation and Growing

The seeds are small and brown, as shown here is a close up of the flower head (image courtesy of Helen Moss), but can be difficult to obtain, making propagation from seed difficult. Transplantation has been the most successful method.

Although G. sieberiana does best in more moist soil it is quite drought tolerant once established, although it does not tolerate saline conditions. It grows in full sun to partial to complete shade.

Be careful with placement in the garden, though, as its leaves have sharp edges that aren't noticeable until it's run through your hand. At the very least, the leaves can be quite an irritant, resulting in welts - at worst, you'll end up with lacerations.

The black flower heads make dramatic dried flower arrangements.

Information sources:
Wrigley, J.W. & Fagg. M., 2003, Australian Native Plants, 5th edition, New Holland press.
Scott, R., Blake, N, Campbell, J., Evans, D., Williams, N., 2002, Indigenous Plants of the Sandbelt, published by Earthcare St Kilda.
Association of Societies for Growing Australian Plants, http://farrer.csu.edu.au/ASGAP/

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