Genus: Onion

Allium

Photo/Illustration: 
Jennifer Benner
Onion (Allium)
AL-ee-um
Liliaceae
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 characteristics:  Pungent leaves. Tubular-based bell-, star-, or cup-shaped flowers usually borne in rounded umbels.
Care:  Grow 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.
Propagation: 

<p>Sow seed in spring in containers or in situ. Divide clump-forming plants in spring. </p>

Problems: 

<p>Bulb rot in damp conditions. Onion fly and thrips. </p>

Species, varieties and clutivars for genus Allium

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Ornamental onion
Allium 'Globemaster'
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Blue globe onion
Allium caeruleum
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Nodding onion
Allium cernuum
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Stars of Persia
Allium christophii
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Ornamental onion
Allium giganteum
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Golden garlic
Allium moly and cvs.
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Chives
Allium schoenoprasum
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Ornamental onion
Allium schubertii
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Ornamental onion
Allium senescens
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Circle onion
Allium senescens var. glaucum
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Drumstick allium
Allium sphaerocephalon
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Japanese onion
Allium thunbergii
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Chinese chives
Allium tuberosum