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Allium giganteum

 

Ornamental Onion

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassLiliopsidaMonocots (plants with a single seed leaf); includes the lily family
SubclassLiliidaeIncludes lilies, orchids, and many others
OrderAsparagalesA diverse group that includes asparagus
FamilyAmaryllidaceaeAmaryllis family—plants that grow from bulbs. Includes onions and many others
GenusAlliumOnions, leeks, shallots, garlic, scallions, etc.
Speciesgiganteum“Gigantic”

About plant names...

Giant onions are native to central Asia. They reach 3-5' (91-152 cm) in height, and about 18" (45 cm) in width. It has large bulbs, 2-3" (5-7.6 cm) in diameter. It is popular with gardeners for its stunning spherical purple-pink flowerheads three or four inches in diameter. Each flowerhead is supported by a smooth, cylindrical, unbranched stem.

Identification: The flowerheads are unmistakable, white or pink, made up of hundreds of tiny, six-petaled flowers. If the plant is not in bloom, the leaves form a basal rosette looking a bit like thick blades of grass up to 18" (45 cm) long.

Online References:

Allium giganteum on FLORIDATA

Allium giganteum at the Missouri Botanical Garden

Allium giganteum on Plants for a Future, a resource and information centre for edible and otherwise useful plants

Allium giganteum on Erv Evans' site at the North Carolina State University College of Agriculture and Life Sciences

Allium giganteum on Wikimedia Commons

Allium giganteum (Ornamental Onion)

6/17/2012 · Coastal Maine Botanical Gardens, Boothbay, ME
≈ 14 × 21" (34 × 52 cm)

Allium giganteum (Ornamental Onion)

5/27/2016 · Acton Arboretum, Acton, MA

Allium giganteum (Ornamental Onion)

6/18/2012 · Ogunquit, ME
≈ 9 × 13" (23 × 32 cm)

Allium giganteum description by Thomas H. Kent, last updated 30 May 2016.

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Allium giganteum (Ornamental Onion)

6/29/2008 · MacDonalds, Westford, MA
≈ 11 × 11" (28 × 27 cm)

Allium giganteum (Ornamental Onion)

5/27/2016 · Acton Arboretum, Acton, MA

Allium giganteum (Ornamental Onion)

6/17/2012 · Coastal Maine Botanical Gardens, Boothbay, ME
≈ 21 × 14" (52 × 34 cm)

Allium giganteum (Ornamental Onion)

5/27/2016 · Acton Arboretum, Acton, MA

Allium giganteum (Ornamental Onion)

6/29/2008 · MacDonalds, Westford, MA
≈ 18 × 12" (46 × 31 cm)

Allium giganteum (Ornamental Onion)

8/3/2007 · Holden, MA · By Philip A. Despo ID is uncertain

Range: Zones 5-8:

About this map...