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. 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.
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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 | Allium |
| 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 | Bees, Butterflies |
| Garden Uses | Beds and Borders |
| Garden Styles | Gravel and Rock Garden, Informal and Cottage |
Recommended Companion Plants
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Raymon Orton, Shutterstock
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 |
| Plant Family | Allium |
| 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 | Bees, Butterflies |
| Garden Uses | Beds and Borders |
| Garden Styles | Gravel and Rock Garden, Informal and Cottage |
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