How to Grow and Care for Giant onion

Giant onion, also known as Ornamental onion

Giant onion is known for its striking appearance and relative ease of care. They thrive best in well-drained soil and need full sun exposure to bloom efficiently. Giant onion requires minimal watering, making sure the soil is not too soggy, as overwatering can cause bulb rot. The most critical care point involves protecting giant onion from strong winds due to their tall stature which can make them prone to breaking.

Watering schedule: Every week

Sunlight Requirements: Full sun

Toxic to Humans

In This Article

Planting and Growing Giant onion

Toughness	High
Care Level	Medium
Care Difficulty	Easy
Lifespan	Perennial, Annual
Watering Schedule	Every week
Sunlight Requirements	Full sun
Soil Type	Garden Soil
Soil pH	6-7.5
Planting Time	Mid spring, Early spring, Late winter, Late summer, Early fall, Mid fall
Hardiness Zones	6-11
Toxicity	Toxic to Humans

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Varieties of Giant onion

Onions 'Powder Puff'

The onions 'Powder Puff' offers sturdy stems holding giant balls of vibrant purple flowers that appear in mid-summer. One can easily guess where the name comes from - the globes of flowers resemble cosmetic powdering balls. It is a cultivar of Allium ornamental onion and holds an RHS Award of Garden Merit. Tolerant of most soil types, it enjoys full sun and makes an eye-catching addition to garden beds while attracting butterflies and bees.

Onions 'Jackpot'

You really do win the jackpot with this one. Just look at its immense lilac-colored, globe-like blooms. Onions 'Jackpot' is an Allium cultivar of unknown parentage. Because of this, experts are unsure exactly how this plant differs from its parent, but it definitely isn't like the common onion, which is another species of this genus!

Onions 'Globemaster'

Onions 'Globemaster' is a type of ornamental onion, which produces spherical, shaggy purple flowers on tall stalks. The flowers of this cultivar are remarkably large, measuring 25 cm in diameter, hence its name - they are like large globes. Unlike other types of flowering onions that tend to produce an 'oniony' smell, these flowers generally lack a fragrance.

Onions 'Beau Regard'

Onions 'Beau Regard' is a captivating ornamental onion with globular, deep lavender blooms that create a striking display atop sturdy stems in late spring to early summer. This hardy perennial thrives in well-drained soil, preferring full sun to bloom profusely. Its clump-forming nature and alluring scent make it a magnet for pollinators, enhancing any garden with its vibrant, spherical flowers.

Onions 'Pinball Wizard'

Onions 'Pinball Wizard' displays a striking presence in the garden with its large, spherical clusters of star-shaped purple flowers. This ornamental onion variety thrives in full sun, where its tall stems rise above many other plants, providing a layer of visual interest at middle to rear borders. Its strong, upright growth and distinctive floral globes attract pollinators while resistive to deer and most pest pressures, making it an appealing choice for diverse garden settings.

Common Pests & Diseases

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The Toxicity of Giant onion

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More General Info About Giant onion

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Quickly Identify Giant onion

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Giant onion stands tall at 35-50 inches (89-127 cm), sporting a majestic umbel packed with close-set, vivid pink florets. Each miniature flower, part of the dense cluster, features six distinct segments. This hardy perennial makes a striking appearance in early summer when its spherical bloom crowns the summit of a leafless stalk. The plant's slight garlic-onion aroma adds to its unique charm, while its preference for moist soils during the growth phase and resistance to summer drought highlights its versatility in various garden settings.