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PlantFiles: Ornamental Onion
Allium thunbergii 'Ozawa'

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: thunbergii (thun-BERG-ee-eye) (Info)
Cultivar: Ozawa

One vendor has this plant for sale.

4 members have or want this plant for trade.


6-12 in. (15-30 cm)

6-9 in. (15-22 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)

Sun Exposure:
Sun to Partial Shade


Bloom Color:
Fuchsia (Red-Purple)

Bloom Time:
Mid Fall


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
By dividing the rootball

Seed Collecting:
Unknown - Tell us

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1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive coriaceous On Jan 20, 2014, coriaceous from ROSLINDALE, MA wrote:

I've grown the cultivar 'Ozawa' for many years. It's a tough, easy plant, valuable for its rich purple flower color, long late season of bloom, and brilliant orange fall foliage color. It clumps up very quickly without being at all aggressive. I've never seen a self-sown seedling.

Though it's a bulbous plant, this species does not go dormant before late fall. The leaves stay healthy, slowly turning a luminous orange, up till Thanksgiving, or later if not hit by hard frost.

Division of the clumps is the easiest way to increase a planting. A single bulb forms a good tight clump in one season. Clumps can be divided any time of year the ground is workable.

This cultivar produces flower scapes about 9" tall in midsummer, but the buds don't begin to open till October. Flowers are colorful, long-lasting, and impervious to frost. When they finally dry, they don't bleach quickly. I've seen them contribute color to the garden as late as Christmas.

"Fuchsia" generally means "magenta", a color to which some people are averse. The flowers of 'Ozawa' are a bright clear red-purple, but they're decidedly not magenta.

Equally great for the rock garden and for the edge of a perennial/mixed border.


This plant has been said to grow in the following regions:

Park Ridge, Illinois
Roslindale, Massachusetts
Uxbridge, Massachusetts
Lisbon, New Hampshire
Clinton Corners, New York
Hendersonville, North Carolina
Wilkes Barre, Pennsylvania

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