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Liliaceae

Allium

AL-ee-um
Allium giganteum

Clump-forming bulbs produce upright, sometimes cylindrical leaves with the characteristic onion aroma present upon bruising. There is a wide array of flower color and forms, although most flowers form in clusters or spherical masses rising well above the foliage. About 700 species.

Noteworthy CharacteristicsPungent leaves. Tubular-based bell-, star-, or cup-shaped flowers usually borne in rounded umbels.

CareGrow in fertile, well-drained soil in full sun. Plant bulbs 2 to 4 inches deep in autumn. Plant clump-forming species at or just below surface grade.

PropagationSow seed in spring in containers or in situ. Divide clump-forming plants in spring. 

ProblemsBulb rot in damp conditions. Onion fly and thrips. 

Species and cultivars

More From the Plant Guide

Winter Interest

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