Forking larkspur is native to Europe and parts of Asia. In contemporary times, forking larkspur has made its presence known across various other major regions as an introduced species. Furthermore, forking larkspur has been successfully cultivated outside its native range, indicating a broader adaptability and appeal.

Forking larkspur is a poisonous plant. All parts are toxic if consumed, especially seeds and new growth, causing neuro-muscular paralysis and potentially death. The sap can irritate the skin. Children face the highest risk due to its enticing flowers. There is no remedy for forking larkspur poisoning.

Forking larkspur can grow in a variety of habitats but prefers dry fields, ditches, roadsides, and wastelands, where it grows in a weedy manner. It is an agricultural weed in cereal crops and cornfields, although its presence has decreased due to intensive agriculture practices and herbicide use. Forking larkspur can also be considered undesirable because of its toxicity. Like with other wildflowers of the Buttercup family, all parts of the plant contain toxic alkaloids. It presents danger to livestock if found in pastures. Despite these traits, forking larkspur is cultivated in the gardens for its attractive flowers, so if you see it in a garden, it doesn't automatically mean it is a weed.