Allium, Ornamental Onion, Ornamental Allium 'Purple Sensation'

Allium hollandicum

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: hollandicum (hol-LAN-dee-kum) (Info)
Cultivar: Purple Sensation
Synonym:Allium aflatunense
View this plant in a garden




Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun





Foliage Color:



24-36 in. (60-90 cm)


6-9 in. (15-22 cm)

9-12 in. (22-30 cm)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Where to Grow:

Grow outdoors year-round in hardiness zone


Unknown - Tell us

Bloom Color:


Medium Purple

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


This plant is said to grow outdoors in the following regions:

San Leandro, California

Aurora, Colorado

Wolcott, Colorado

New Milford, Connecticut

Buford, Georgia

Cumming, Georgia

Lawrenceville, Georgia

Algonquin, Illinois

Rock Falls, Illinois

Saint Charles, Illinois

Macy, Indiana

Petersburg, Indiana

Olathe, Kansas

Barbourville, Kentucky

Ewing, Kentucky

Hebron, Kentucky

Mount Sterling, Kentucky

Durham, Maine

Freedom, Maine

Ellicott City, Maryland

West Friendship, Maryland

Peabody, Massachusetts

Roslindale, Massachusetts

Winchester, Massachusetts

Grant, Michigan

Mason, Michigan

Royal Oak, Michigan

Albertville, Minnesota

Florence, Mississippi

South Plainfield, New Jersey

Whitehouse Station, New Jersey

Los Alamos, New Mexico

Roswell, New Mexico

Clinton Corners, New York

Pittsford, New York

Fargo, North Dakota

Cleveland, Ohio

Felicity, Ohio

Geneva, Ohio

Norristown, Pennsylvania

Wilkes Barre, Pennsylvania

Conway, South Carolina

Knoxville, Tennessee

Austin, Texas

Whitney, Texas

Castlewood, Virginia

Leesburg, Virginia

Petersburg, Virginia

Weber City, Virginia

Kalama, Washington

North Bend, Washington

Seattle, Washington

Vancouver, Washington

Cody, Wyoming

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Gardeners' Notes:


On Jun 13, 2015, crayondoom from Fargo, ND (Zone 4a) wrote:

One of the only bulbs the squirrels won't dig up, these plants are great. I am planning on putting in more this fall.


On Feb 20, 2014, coriaceous from ROSLINDALE, MA wrote:

Spherical masses of bright purple flowers on a straight stalk (not over 2' tall in my experience). Blooms in mid-May here in Boston Z6a. Blooms before A. christophii without overlapping. Leaves begin to go dormant during flowering.

These are more modest in scale than A. giganteum and the statuesque globe hybrids. They're also much cheaper and much more inclined to perennialize.

Their most important needs are full sun and good drainage. Not usually attractive to critters.

I've seen these increase a little, but not as much as I'd like. A fine border plant, this is one of the few alliums that can tolerate shading by other close-growing perennials. They should be planted in groups, and with abandon. (Don't worry, they're inexpensive.)


On Jul 4, 2012, rozreads from Wolcott, CO wrote:

grows at 9000' in Colorado mountains, although may die out with a very long, wet spring


On May 22, 2011, nutsaboutnature from Algonquin, IL (Zone 5a) wrote:

I love Allium Purple Sensation!

I planted 10 last Autumn just to try them (they're already multiplying . . . 11 have come up). They are spectacular, opening one at a time, then they keep growing after they open, & now they're huge & still growing!

They're growing right in front of some Salvia Eveline that I planted last Spring (another experiment) & the combination of the Purple-Violet Alliums with the Light Pink Salvias is beautiful & eye-catching.

We have all sorts of wild critters in our area & though we thoroughly enjoy them, I normally have to resort to things like "Liquid Fence" on many of the plants. . .but none of the critters have any interest in the Alliums which is another bonus!

I will definitely be planting more of t... read more


On May 28, 2010, trflan from Horseshoe Bay , TX (Zone 8b) wrote:

We put a cabin on 10 acres close to Whitney, TX. These odd plants that looked like stunted, pale corn stalks started coming up in areas that had been bulldozed and covered with rock. Last week they bloomed and are so pretty and unique. One stalk had to wrap under a split rail fence to bloom. We have deer, sandy soil, nothing gets watered and it gets very hot, so these guys are tough!


On Jan 17, 2010, Leehallfae from Seattle, WA wrote:

Alliums are generally a reliable bloomer. On the plus side, they are not attractive to squirrels.

Purple Sensation are just as the name says. Plant them in bunches of 7 or 10 for a more visually pleasant spot in the yard: Yellow daffodils planted in front of the Purple Sensation is a most pleasing contrast.

Allium aflatunense is described as being lilac purple in hue. These would look splendid next to Blue Girl or Midnight Magic Blue Roses. Add some Blue (true blue) Hyacinths, then enjoy.


On Dec 1, 2006, bluespiral from (Zone 7a) wrote:

I like the way these purple spheres seem to float above the leaves of perennials under which they are planted - like visiting UFOs.


On Feb 28, 2006, TBGDN from (Zone 5a) wrote:

Very attractive mid to late spring bulbs. Dresses up a perennial bed while the main plants are waiting their turn to bloom. Very hardy here; easily grown.


On Feb 25, 2006, catcollins from West Friendship, MD (Zone 6b) wrote:

This is a super easy, dramatic, stand out in the garden. It never needs staking, even with the strong Spring storms we get in central Maryland. The flowers last a really long time and help fill that awkward gap between the later spring bulbs and the perennials. I plant these 10 at a time, to be sure I have some to cut for bouquets. They do fine in a bit of shade and just flower a little later. I have some planted in damp soil and others in hard, rocky soil. No problems. Our deer and chipmunks leave these alone.