Propagation
Sow fresh seeds in situ during spring in a prepared bed with frost protection or sow seed when ripe and place in a cold frame to germinate. 
Division of the clump during late spring to early summer.

Botanic information
Leaf: The 3-ranked dark green arching long linear leaves have parallel veins and the underside is silvery-grey.

Flower: The tiny flowers are arranged in a brown spike up to 30mm (1¼in) long. The female and male flowers are arranged above each other and the female flower is enclosed in a bladder-like perigynium and has 1-style and 2 or 3 stigmas. They appear from late spring to early summer.

Fruit: