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Allium giganteum



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Allium Giganteum lives up to its name! They are huge! With heights of 4-5 feet, this Allium is a show stopper. It’s made up of perfect little purple florets that create a large round ball on top of a sturdy stem, similar to a topiary. Adding Allium to a garden will make heads turn and grab attention. The best way to plant is in large groupings for a more contemporary style or periodically place throughout a garden. Blooms in late spring to early summer. (Allium)

Zones 4 - 9
Deer Resistant
Deer Resistant
Attract Butterflies
Attract Butterflies
Bee Friendly
Bee Friendly
Easy to Grow
Easy to Grow
Cut Flowers
Cut Flowers
Dried Flowers
Dried Flowers
Light Requirements
Full Sun
Full Sun
Half Sun / Half Shade
Half Sun / Half Shade
Mature Plant Size 50-60" tall
Bulb Spacing3 bulbs per sq. ft.
Bloom Time Late spring to early summer
Size Bag of 1 - Bulb Size: 20+ cm

Plant Information

About the Alliums. Every family has its beauties. And yes, these are the best-looking members of the family of Allium, which includes onions, leeks and chives. (The word, Allium, means 'onion' in Latin.) Many Allium species are native to Iran, where many tulips also originate, and the edible Alliums have been cultivated and a staple of diets for over 10,000 years.

The beauty of the small lavender flowerheads of chives have always been a decorative highlight in herb gardens. But in recent years, gardeners have become fascinated with the larger Alliums, particular the giants. As always, the Dutch hybridizers took them into their stocks, and now we have a whole group of beautiful new flowering onions for gardens. Most bloom in late spring so they bridge the gap nicely between the tulip season and early summer bloom of peonies and poppies.

Experienced gardeners plant these giant Alliums in groups of several bulbs, set very close together. The foliage is not attractive for long, so it's important to plant them next to other perennials whose foliage will more or less cover the Allium's base. This way, the wonderful flower stalks rise up and tower over the other flowers for a wonderful period of bloom.

Common Name Persian Onion
Botanical Name Allium giganteum
Zones 4, 5, 6, 7, 8, 9
Ships As Bulb, Rhizome, Tuber
Light Requirements Full Sun, Half Sun / Half Shade
Flower Color Purple
Mature Height 50-60" tall
Bulb Size 20+ cm
Bulb Spacing 3 bulbs per sq. ft.
Planting Depth Plant 8" deep
Bloom Time Late spring to early summer
Plant Type / Life Cycle Perennial
Flower Size 6-8" flowers
Planting Time Fall
Soil Type Loamy Soil
Soil Moisture Average, Well Draining
Advantages Deer Resistant, Attract Butterflies, Bee Friendly, Easy to Grow, Fragrant, Cut Flowers, Dried Flowers
Prohibited In Idaho
Ships to Hawaii, Alaska & Canada No


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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. Fall bulbs are shipped at the proper planting time for your hardiness zone. Perennial orders may arrive separately from bulbs and seeds. If your order requires more than one shipment, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (877) 309-7333 or contact us by email.

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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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