Allium Species, Ornamental Onion, Round Headed Leek

Alliumsphaerocephalon

Family
Amaryllidaceae (am-uh-ril-id-AY-see-ee)
Genus
Allium (AL-ee-um)
Species
sphaerocephalon (sfay-ro-SEF-uh-lon)
Synonym
Allium aegaeum
Allium aestivum
Allium approximatum
Allium borbasii
Allium bosniacum
Sun Exposure
Full Sun
Foliage
Deciduous
Shiny/Glossy
Smooth
Height
24-36 in. (60-90 cm)
Spacing
3-6 in. (7-15 cm)
Hardiness
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)
Danger
N/A
Bloom Color
Fuchsia (red-purple)
Bloom Time
Mid Summer
Other Details
Category
Bulbs
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; sow indoors before last frost
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

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

Wedowee, Alabama

Belmont, California

San Jose, California

Denver, Colorado

Welaka, Florida

Algonquin, Illinois

Chicago, Illinois(2 reports)

Grayslake, Illinois

Mount Prospect, Illinois

Naperville, Illinois

Shawnee Mission, Kansas

Ewing, Kentucky

Cumberland, Maryland

Parkville, Maryland

Roslindale, Massachusetts

Springfield, Massachusetts

Uxbridge, Massachusetts

Garden City, Michigan

Owosso, Michigan

Pinconning, Michigan

Florence, Mississippi

Binghamton, New York

Chester, New York

Deposit, New York

Yonkers, New York

Rowland, North Carolina

MOUNT HOOD PARKDALE, Oregon

Norristown, Pennsylvania

Pittsburgh, Pennsylvania

Wilkes Barre, Pennsylvania

Florence, South Carolina

North Augusta, South Carolina

Knoxville, Tennessee

Austin, Texas

Boerne, Texas

Houston, Texas

Farmington, Utah

Salt Lake City, Utah

Lanexa, Virginia

Richmond, Virginia

Kalama, Washington

Seattle, Washington

Buffalo, West Virginia

show all

Featured Videos

Gardener's Notes:

5
positives
1
neutral
3
negatives
Sort By:
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K
| May 2017 | negative

I saw these in someone else's formal-looking garden a few years ago and thought they looked great. I bought some fairly pricey bulbs. N...Read More

R
Chicago, IL | July 2015 | negative

I planted about 25 of these in full sun and was not impressed by the way they all started drooping and leaning once they bloomed, mostly ...Read More

C
ROSLINDALE, MA | February 2014 | negative

I'm not enthusiastic about this onion.

It grows well enough here. It offsets a little too enthusiastically and gets a lit...Read More

N
Algonquin, IL (Zone 5a) | April 2010 | positive

I planted a big bag of these (100) in Autumn 2008 that I purchased from a "Home Center Store". I was new at planting bulbs, waited too l...Read More

W
Jones Creek, TX (Zone 9a) | June 2006 | positive

Drumstick Allium, are said to be very good for naturalizing. Their dark crimson to deep purple flowers are egg shaped and are held on thi...Read More

S
S
(Zone 8b) | July 2005 | positive

It's always surprising when it peeps out through the grasses...looks wonderfull and it demands nothing at all ...it echos plants or flowe...Read More

N
West Chazy, NY (Zone 4b) | March 2005 | positive

A wonderful mixer, great interplanted among perennials. The bulbs are very reasonable to buy and they also multiply nicely.

S
Old Town, FL | September 2003 | positive

I grew this plant in a suburb of Atlanta, Georgia, for several years, and these little bulbs are the cheapest and most readily available ...Read More

B
B
Baa
| July 2002 | neutral

Perennial bulb from Europe, West Asia and North Africa.

Has long, linear leaves. Bears rounded to egg shaped, crowded head...Read More

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