New Arrival

Allium Rosenbachianum

Ornamental Onion, Showy Persian Onion
$9.95 ea.
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Ships Late September to
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Blooms Earlier Than Other Allium
Each dark violet sphere of Allium Rosenbachium measures approximately 4 inches in diameter and is packed with up to 50 star-shaped florets adorned with white stamens. These eye-catching perennials rise on sturdy stems, above broad, gray-green foliage. Ideal for perennial beds, Allium Rosenbachium is rich in nectar and pollen, making it a magnet for bees, butterflies, and other pollinators. It is also an excellent choice for long-lasting cut flowers. This showy Persian Onion is a rare heritage species native to the Himalayas and blooms two weeks earlier than other large-flowered Alliums.

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Code BALRO

Patent

Plant Type Bulbs

Species kwakense

Height Tall 40-48"

Spacing Plant 8-12" apart

Bloom Time Late Spring to Early Summer

Sun / Shade Full Sun to Mostly Sunny

Zones 3-9

Soil Type Normal, Sandy

Water Needs Medium

Sold In Bags of 3

Special Features

  • Beneficial for Pollinators
  • Attracts Butterflies
  • Good for Cut Flowers
  • Deer Resistant
  • Fragrant
  • Rabbit Resistant
  • Hot Dry Site Tolerant

Allium General Information

Later spring blooming ornamental plants that work great with early flowering summer perennials. Do not plant too closely together since they multiply rapidly. Plant Alliums in full sun in early fall. Water well throughout the growing season. Please note: We are not permitted to ship Alliums to Idaho or the Washington counties of Adams, Benton, Franklin, Grant or Klickitat.

Allium Plant Care

The smaller varieties of Allium should be planted 4" deep and the larger varieties 7-8" deep. Spacing 6-8". Likes well-drained soil. Clumps may be lifted and divided in either spring or fall. Allium will tolerate most soils, but performs best in sandy soils. Add organic matter like compost to clay soils if needed to improve drainage and lighten the soil.

100% Guarantee

We offer a 100% guarantee for all our accent annuals and bulbs to reach you in good condition and come up. If you're not satisfied, we'll reship or refund immediately. Please don't hesitate to contact us if you have questions or concerns—we share your passion for gardening and want your new plants to thrive in your border!

Shipping Details

We ship accent annuals and bulbs based on the best planting time for your growing zone (see the approximate dates below), unless otherwise indicated at checkout. If you wish, you can indicate a specific ship date during checkout.

Spring-Planted Accent Annuals

  • Zone 3, 4: Early to Mid May
  • Zone 5: Late April to Early May
  • Zone 6: Mid to Late April
  • Zone 7: Early to Mid April
  • Zone 8,9, 10: Early April

Fall-Planted Bulbs

  • Zone 2, 3, 4: Early September
  • Zone 5: Early to Mid September
  • Zone 6: Mid September
  • Zone 7: Mid to Late September
  • Zone 8, 9, 10: Late September to Early October

Holiday Bulbs

  • Early November through mid December