This weed commonly grows in rich open woods, along streams, in old fields, along roadsides, and on sand hills. Wild larkspur is most common in the southern two-thirds of the state, but the equally poisonous cultivated larkspur may be found in gardens statewide. Larkspur is primarily a problem in western ranges, especially with cattle. Apparently, the plant is palatable, which increases the risk of clinical toxicosis. The toxicity of larkspur varies, with the highest periods of toxicity occurring during early growth, and when the plant goes to seed.
Signs appear within a few hours of ingestion.
A higher dose is needed before sheep and horses show clinical signs. There is no antidote for larkspur poisoning, and treatment is supportive. Affected animals should not be handled any more than necessary, since stress will worsen the signs. Larkspur remains toxic when dry, therefore hay and other prepared feeds will be toxic. Keeping pastures mowed will greatly reduce the number of larkspur plants.