Many of the delphiniums grown in gardens today are hybrids of Delphinium x elatum . The name delphinium is derived from the Greek word delphis, which refers to the dolphin-shaped flower buds before they open. Flowers are usually blue, but also come in white, pink, red, violet, and purple. The true larkspur is Consolida ambigua . The common name larkspur comes from the shape of the flower, which resembles a lark's spur or claw.
Larkspurs have daintier flower spikes with fewer florets and fine, more deeply cut leaves.
Some delphiniums grow up to 6 feet tall, making them excellent background plants. Others are much shorter. Blue Butterfly' is one of the shortest delphiniums maturing at 15 inches. Delphiniums perform best in well-drained soils in full sun. They are heavy feeders and should be fertilized in early spring and later in the season.