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Allium howellii
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Howell's Onion
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Allium howellii

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About Howell's Onion (Allium howellii) Allium howellii is a species of wild onion known by the common name Howell's onion. It is endemic to California, where it grows in the granite and serpentine soils of several of the local mountain ranges, hills, and valleys. This is a tall onion plant, producing a stem which may exceed half a meter in height from a reddish-brown bulb one to two centimeters long. There is a single cylindrical leaf about as long as the stem. The flower cluster holds up to 100 dark-veined lavender to white flowers, each under a centimeter long.
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 2 ft (0.3 - 0.6 m)

Flower Color
Lavender, White, Pink

Native Status

Natural Setting
Site Type
granitic soils

Sun, Part Shade

Elevation ?
224' - 7076'

Annual Precip. ?
5.7" - 37.4"

Summer Precip. ?
0.14" - 1.22"

Coldest Month ?
32.6° F - 51.4° F

Hottest Month ?
59.4° F - 78.9° F

Humidity ?
1.21 vpd - 27.89 vpd

Landscaping Information
Propagation ?
For propagating by seed: No treatment.

Common uses
Bee Gardens

Nursery Availability
Rarely Available

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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