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Delphinium trolliifolium
Also called Cow Poison, Poison Larkspur
Columbian larkspur is a native perennial wildflower of the Pacific Northwest and northern California, with tall spikes of deep blue flowers. It is grown in wild or woodland-style gardens and needs good drainage and a cool, moist spring.
Delphinium trolliifolium is a species of larkspur known by the common names poison delphinium, cow poison, and Columbian larkspur. It is native to Washington, 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 inflorescence 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 (particularly to livestock) as suggested by the common names, but most larkspur species are toxic to some degree.
Doubtful knight's-spur · Consolida armeniaca · Consolida oliveriana · Royal knight's-spur · Anderson's larkspur · Baker's delphinium · Subalpine larkspur · Little larkspur · Musk Larkspur · California larkspur · Delphinium calthifolium · Scarlet larkspur
Text excerpted from the Wikipedia article Delphinium trolliifolium by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
