Gahnia grandis is a tussock-forming perennial plant found in southeastern mainland Australia and Tasmania.

Originally described by botanist Jacques Labillardière as Scleria grandis in 1800, it was placed in its current genus by S. T. Blake in 1969. In Tasmania, Gahnia is the most widely seen genus, with seven native species. Six of these species are very large, erect graminoids with sharp-edged leaves resembling a razor, hence the common names cutting grass and cutty grass.

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