Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Audio Play Icon Headphones Icon Plus Icon Minus Icon Check Icon Print Icon Note Icon Heart Icon Filled Heart Icon Single Arrow Icon Double Arrow Icon Hamburger Icon TV Icon Close Icon Sorted Hamburger/Search Icon


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

Partial Shade

Browse the Full Plant Guide

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to decades of expert advice, regional content, and more, plus the print magazine.

Start your FREE trial