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Allium rosenbachianum (Showy Persian Onion)

Showy Persian Onion, Ornamental Allium, Showy Onion,

Allium Rosenbachianum, Ornamental Allium, Showy Persian Onion, Showy Onion, Purple Flowers

Blooming about two weeks earlier than the other large Alliums, Allium rosenbachianum (Showy Persian Onion) is a bulbous perennial with large, rounded umbels, 4 in. across (10 cm), packed with up to 50 deep-purple, star-shaped flowers adorned with prominent, white stamens. Blooming in late spring, the eye-catching flowers are borne on tall leafless stems above the foliage of broad, strap-shaped, gray-green basal leaves which wither as the flowers emerge. The flowers are both long-lasting and excellent as cut flowers.

  • Grows up to 24-36 in. tall (60-90 cm) and 6-12 in. wide (15-30 cm).
  • Thrives in fertile, well-drained soils in full sun to part shade. Add grit to clay soils to improve drainage.  This Allium is drought tolerant.
  • Lovely in beds and borders, cottage gardens, or rock gardens. To achieve an impressive visual effect, plant in clusters of at least three to five close together.
  • Attracts butterflies, but deer ignore it.
  • Generally pest and disease free. Keep an eye out for onion white rot and downy mildew.
  • Allium rosenbachianum is native to Central Asia, Afghanistan and Pakistan.

Requirements

Hardiness 6 - 9
Heat Zones 1 - 9
Climate Zones 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Bulbs
Plant Family Amaryllidaceae
Genus Allium
Common names Onion, Ornamental Onion
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Height 2' - 3'
(60cm - 90cm)
Spread 6" - 1'
(15cm - 30cm)
Spacing 8" - 10"
(20cm - 25cm)
Depth 6" - 8"
(15cm - 20cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Drought, Deer
Attracts Bees, Butterflies
Garden Uses Beds And Borders
Garden Styles Informal and Cottage, Gravel and Rock Garden
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Alternative Plants to Consider

Allium cepa Aggregatum Group (Shallot)
Allium cepa (Onion)
Allium sativum (Garlic)
Allium ‘Pinball Wizard’ (Ornamental Onion)
Allium ‘Purple Rain’ (Ornamental Onion)
Allium amethystinum ‘Red Mohican’ (Ornamental Onion)

Recommended Companion Plants

Echinacea (Coneflower)
Agastache (Hyssop)
Achillea (Yarrow)
Papaver orientale (Oriental Poppy)

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While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 6 - 9
Heat Zones 1 - 9
Climate Zones 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Bulbs
Plant Family Amaryllidaceae
Genus Allium
Common names Onion, Ornamental Onion
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Height 2' - 3'
(60cm - 90cm)
Spread 6" - 1'
(15cm - 30cm)
Spacing 8" - 10"
(20cm - 25cm)
Depth 6" - 8"
(15cm - 20cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Drought, Deer
Attracts Bees, Butterflies
Garden Uses Beds And Borders
Garden Styles Informal and Cottage, Gravel and Rock Garden
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Allium
Guides with
Allium
Not sure which Allium to pick?
Compare Now

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