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One Leaf Onion
( Allium unifolium )
Allium unifolium
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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20 Nurseries Carry This Plant
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About One Leaf Onion (Allium unifolium)
20 Nurseries Carry This Plant
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Allium unifolium
, the one-leaf onion or American garlic, is a North American species of wild onion. It is native to the coastal mountain ranges of California, Oregon, and Baja California. It grows on clay soils including serpentine, at elevations up to 1100 m.
Allium unifolium
, despite its name, usually has 2-3 flat leaves up to 50 cm long. Bulbs, though, are usually solitary, egg-shaped, up to 2 cm long, often formed at the end of rhizomes spreading out from the parent plant. Scapes are round in cross-section, up to 80 cm tall. Flowers are up to 15 mm across; tepals usually pink but occasionally white; anthers yellow or purple.
Plant Description
Plant Type
Perennial herb
Size
1 - 2.6 ft tall
1 in wide
Form
Upright Columnar
Growth Rate
Slow
Dormancy
Summer Deciduous
Fragrance
Slight
Flower Color
Lavender, Pink, Yellow, White, Purple
Flowering Season
Spring
Wildlife Supported
Butterflies & moths hosted ( 16
likely
* )
SHOW ALL
*
Alfalfa Looper Moth
Autographa californica
Autographa californica
*
Armyworm Moth
Mythimna unipuncta
Mythimna unipuncta
*
Subterranean Dart
Feltia subterranea
Feltia subterranea
*
Ipsilon Dart
Agrotis ipsilon
Agrotis ipsilon
*
Western Yellowstriped Armyworm
Spodoptera praefica
Spodoptera praefica
*
Salt Marsh Moth or Acrea Moth
Estigmene acrea
Estigmene acrea
*
Virginian Tiger Moth
Spilosoma virginica
Spilosoma virginica
Landscaping Information
Sun
Full Shade, Part Shade
Moisture
Low
Summer Irrigation
Never irrigate once established
Nurseries
Carried by 20
Ease of Care
Very Easy
Cold Tolerance
Tolerates cold to 10° F
Soil Drainage
Slow
Soil Description
Prefers heavy soils but tolerates a variety of garden soils. Tolerates serpentine soils. Soil PH: 7.0 - 9.0
Common uses
Butterfly Gardens, Deer Resistant, Bee Gardens
Companion Plants
Native grasses,
Miner's Lettuce
, Dudleya spp,
Sunset Zones
?
4, 5, 6, 7*, 8, 9*, 14*, 15*, 16*, 17*, 18, 19*, 20*, 21*, 22*, 23*, 24*
Natural Setting
Site Type
Pockets of grassland within forest or chaparral, or grassy streambanks with moist clay soils, in the Coast Ranges and foothills
Climate
Annual Precipitation: 10.5" - 77.7", Summer Precipitation: 0.22" - 1.62", Coldest Month: 40.7" - 51.3", Hottest Month: 58.8" - 79.0", Humidity: 0.04" - 25.23", Elevation: 22" - 4155"
Alternative Names
Common Names
: Oneleaf Onion
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One Leaf Onion
Allium unifolium
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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