Allium rosenbachianum

Allium rosenbachianum are early bloomers in the late-spring parade of globe Allium. Unique and effortlessly elegant, they stand tall at 32-38" with 4" diameter dark-violet globes. Each globe has over 50 starry florets with darker mid-veins and white stamens. They can extend your season of enjoyment by blooming about 2 weeks ahead of the other globe Alliums (Ornamental Onions). Plant with white Mount Everest Alliums for lovely contrasting blooms.

Zones	4 - 10
Advantages	Bee Friendly Attract Butterflies Deer Resistant Good For Dried Flowers Good For Containers Rabbit Resistant
Light Requirements	Full Sun Morning Sun & Afternoon Shade
Mature Spread	20-24" tall
Bulb Spacing	3 bulbs per sq. ft.
Bloom Time	Late spring
Shipping Details	No longer available this season. Learn More…
Item Package Size	Bag of 3
SKU	HC008526

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

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HC008526

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Details

Allium rosenbachianum (Showy Persian Onion) are essential flowers for all Allium-loving gardeners. The purple globes, like Spanish exclamation points, draw the eye and bring a smile. Allium rosenbachianum is a hard-to-find heritage variety in cultivation since around 1894. Blooming two weeks ahead of the other large Allium, they’ll extend your enjoyment of one of our most unique garden flowers. Plant these Allium in groups of three or so in a sun to part-shade location in enriched, well-drained soil. They work well planted in a perennial bed where the perennials will grow in and cover the allium’s aging foliage. Great cut flowers too, they are favorites of bees, butterflies and other pollinators. Easy-to grow, they are drought tolerant, deer and rabbit resistant and are nearly pest and disease free. There is something spectacular about Allium’s architectural and colorful presence in the flower garden.

More Information
SKU	HC008526
Common Name	Rosenbachianum Ornamental Onion
Botanical Name	Allium rosenbachianum
Zones	4, 5, 6, 7, 8, 9, 10
Light Requirements	Full Sun, Morning Sun & Afternoon Shade
Flower Color	Purple
Mature Height	20-24" tall
Bulb Spacing	3 bulbs per sq. ft.
Flower Bulb Size	14 cm
Planting Depth	Plant 6-8" deep
Bloom Time	Late spring
Advantages	Bee Friendly, Attract Butterflies, Deer Resistant, Good For Dried Flowers, Good For Containers, Rabbit Resistant
Soil Type	Average Soil, Sandy Soil, Well-Drained Soil
Soil Moisture	Waterwise, Average
Item Package Size	Bag of 3
Ships As	Bulb, Rhizome, Tuber
Planting Time	Fall
Ideal Region	Northeast, Southeast, Midwest, West, Southwest, Hot Desert, Pacific Northwest, Coastal California, Suitable Above 7000 ft
Prohibited	Idaho, Oregon, Washington
Ships To Canada	No

Planting Guides

Tips on Growing Fall Planted Flower Bulbs

When you receive your spring bulbs (tulips, daffodils, etc.) keep them in a dry, dark, cool place until ready to plant. They need air circulation so they will not collect moisture and rot. Planting times can vary from early October in the North to mid-to-late November in the southern regions. A good rule of thumb is to plant them about 6 weeks before the ground is frozen or after the first hard freeze. For more information and a planting depth illustration, see pages 14-16 of our Planting Guide.

Soil Preparation for Bulbs

A compost-enriched, well-drained soil is best. Incorporate a good quality organic compost as needed. Yum Yum Mix® is recommended as an excellent source of nitrogen, phosphorus, and potassium needed for strong plants and healthy roots. Mix a small amount into the bottom of the hole before planting your bulbs.

Many bulbs prefer full sun exposure. However, Muscaria, Allium, Galanthus, Hyacinthoides, Scilla and many Daffodils will tolerate partial shade and bloom well. Pink daffodils will hold their color longer if planted in dappled shade or morning sun/afternoon shade.

After planting, add a top dressing of compost or other organic material and water in thoroughly. If your winter is dry, water every three to four weeks throughout the winter and add more mulch if necessary.

Protect your Bulbs

Apply a mole or gopher repellent to the surface of the ground to protect bulbs from these burrowing mammals. As bulbs sprout, use our Deer Off Repellent to prevent deer and rabbits from browsing your spring blooms.

After your Bulbs have Bloomed

Once your bulbs have bloomed, allow the bulb foliage to brown and fade naturally since the leaves are feeding the bulb in the ground. Removal of foliage weakens the bulb and leads to fewer blooms the following year. Planting your bulbs amongst your perennials is one way to conceal the dying bulb foliage. The perennials begin to grow and fill out as the bulb foliage dies back. The perennials will then provide foliage and color in the garden from late spring through the summer and into fall. Regular fertilization with balanced organic or natural fertilizer and a re-application of mulch each fall will ensure more and more beautiful spring bulb blooms for many years!

View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.

Shipping

No longer available this season.

As soon as your order is placed you will receive a confirmation email. You will receive a second email the day your order ships telling you how it has been sent. Some perennials are shipped as potted plants, some as perennial roots packed in peat. The ‘Plant Information’ section describes how that item will ship. All perennials and spring-planted bulbs are packaged to withstand shipping and are fully-guaranteed. Please open upon receipt and follow the instructions included.

Perennials and spring-planted bulbs are shipped at the proper planting time for your hardiness zone. Perennial and spring-planted bulb orders will arrive separately from seeds. If your order requires more than one shipment and all items are shipping to the same address, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you have any questions, please call Customer Service toll-free at (800) 925-9387 or contact us by email.

Shipping Rates

Our shipping rates are calculated based on our actual average shipping costs. We do not seek to profit from shipping fees, so rest assured that our shipping rates reflect an average of what it costs to get our guaranteed products safely to your door.

US Shipping Charges

Merchandise Total	Shipping Charges
Up to $19.99	$8.99
$20 to $34.99	$10.99
$35 to $49.99	$12.99
$50 to $74.99	$14.99
$75 to $99.99	$16.99
$100 and Over	$18.99

Canadian Shipping Charges

Merchandise	Shipping Charges
Up to $24.99	$14.95
$25 to $49.99	$19.95
$50 to $74.99	$24.95
$75 to $99.99	$29.95
$100 and Over	$39.95

We charge one low flat rate for shipping our products even if your order requires multiple shipments. If you have any questions, please call us at (800) 925-9387.

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Allium rosenbachianum