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Delphinium trolliifolium
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Columbian Larkspur
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Delphinium trolliifolium

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About Columbian Larkspur (Delphinium trolliifolium) Delphinium trolliifolium is a species of larkspur known by the common names poison delphinium, cow poison, and Columbian larkspur. It is native to Oregon and northern California. This wildflower reaches one half to just over one meter in height. It has large, shiny, deeply lobed leaves. The top half of the stem is an flower cluster of widely spaced flowers on long pedicels, the longest over nine centimeters long. The flowers are usually deep brilliant blue. The upper two petals may be milky white. The spur exceeds two centimeters in length in the largest of the flowers. This plant is toxic as the common names suggest, but most larkspur species are toxic to some degree.
Plant Description
Plant Type
Perennial herb

Max. Height
1.6 - 6 ft (0.49 - 1.8 m)

Flower Color
Blue, White

Native Status

Natural Setting
Shade, Part Shade

Elevation ?
45' - 4252'

Annual Precip. ?
41.4" - 111.1"

Summer Precip. ?
0.69" - 3.29"

Coldest Month ?
38.3° F - 47.1° F

Hottest Month ?
58.2° F - 72.9° F

Humidity ?
0.25 vpd - 23.33 vpd

Sunset Zones ?
4*, 5, 6*, 16, 17

Landscaping Information
Common uses
Hummingbird Gardens, Bee Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Poison Delphinium, Cow Poison

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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