Alphabetical Plant Listing

Allium rosenbachianum (Showy Persian Onion)

Showy Persian Onion, Ornamental Allium, Showy Onion,


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. 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.
  • Cut back after flowering or merely remove dead flowerheads.

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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, Perennials
Plant Family Alliums
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)
Water Needs Average
Maintenance Low
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 Deer, Drought
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage

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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.


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, Perennials
Plant Family Alliums
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)
Water Needs Average
Maintenance Low
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 Deer, Drought
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage

Great Plant Combination Ideas with Alliums

Guides with Alliums

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