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Allium dichlamydeum

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About Coast Onion (Allium dichlamydeum) Allium dichlamydeum is a species of wild onion known by the common name coastal onion. It is endemic to California where it grows on sea cliffs on the coastline in the northern half of the state. The coastal onion grows from a brown or gray bulb one to one and a half centimeters wide. It has a stout naked green stem surrounded by 3 to 6 long onion leaves. Atop the thick stem is an flower cluster of five to 30 flowers. Each flower has six oval-shaped dull-pointed petals in shades of bright magenta to fuchsia and each flower is about a centimeter wide.
Plant Description
Plant Type
Perennial herb

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Dry clay soil on or sea cliffs


Elevation ?
1' - 947'

Annual Precip. ?
21.2" - 44.1"

Summer Precip. ?
0.26" - 0.77"

Coldest Month ?
45.9° F - 51.5° F

Hottest Month ?
58.8° F - 72.0° F

Humidity ?
0.07 vpd - 17.03 vpd


Sunset Zones ?
5, 14, 15, 16, 17*, 19, 20, 21, 22, 23, 24

Landscaping Information
Ease of Care
Moderately Easy

Propagation ?
For propagating by seed: No treatment.

Common uses
Bee Gardens

Nursery Availability
Rarely Available

Other Names
Common Names
Coastal Onion

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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