Delphinium exaltatum, commonly called tall larkspur, grows 4-6' tall and features blue flowers which bloom in summer. Individual flowers are complex and asymmetrical and feature five sepals, one of which is spurred into a distinctive prong resulting in the common name. This species is taller, blooms later and has more abundant foliage than most other native U.S. larkspurs. As is the case with many of the buttercup family members, all parts of this plant are poisonous.
Best grown in fertile, medium moisture, well-drained soils in full sun. Appreciates some afternoon shade in hot summer climates. Needs protection from strong winds. Fertilize regularly. Remove spent flower spikes to encourage additional bloom and/or a possible second, albeit sparse, autumn bloom. Dislikes the hot and humid climates of the deep South, but generally has better tolerance for these conditions than most of the delphinium hybrids. May be grown from seed.
Type: Herbaceous perennial
Zone: 5 to 7
Height: 4.00 to 6.00 feet
Spread: 1.00 to 2.00 feet
Bloom Time: July to September
Bloom Description: Gentian blue
Sun: Full sun