Propagation
Sow fresh seeds during spring in pots or boxes. Transplant the seedlings into a prepared bed with added organic matter and space 200 mm (8in) apart.

Divide offsets during autumn and plant the bulbs up to 100m (4in) deep.

Botanic information
Leaf: The blue-green leaves are long-linear up to 50mm (2in) wide and dilating at the base forming a sheath around the stem. The apex is acute and the concave leaves have a prominent midrib. When crushed the leaves emit a strong onion smell.

Flower: The tiny flowers have 6-perianth segments with exserted stamens and are arranged in a dense terminal umbel. This is held above the foliage on a tall scape up to 1m (3ft). The flower head is subtended with a long deciduous bract and they appear from spring to early summer.

Fruit: The small loculicidal capsule contains small black seeds that are very viable. The small seeds are viable but the plant is commonly reproduced vegetatively.