delphiniums

Delphinium, commonly known as delphinium or larkspur, is a genus of herbaceous perennials and annuals in the buttercup family (Ranunculaceae), comprising about 300 species. They are noted for tall, upright spires of densely packed flowers that rise above the foliage. The blossoms appear in shades of blue, purple, white, and pink, often with a contrasting center. The name derives from the Greek delphinion, referring to the flower’s spur.

Most delphiniums prefer cool, sunny conditions and fertile, well-drained soil. They generally require regular moisture and benefit from light feeding. Tall varieties require staking to protect against flopping in wind or rain. They may be susceptible to powdery mildew and other diseases in damp or humid conditions, and to pests such as aphids and slugs. In hot climates, some cultivars struggle and may decline in midsummer.

Delphiniums are propagated by seed, root division, or divisions of older clumps. They typically bloom in late spring to early summer, with some varieties flowering later. Deadheading can encourage continued flowering, and removing spent flower spikes helps maintain appearance. Many cultivars have been developed for varying heights and colors, making them popular for borders, tall focal points, and cutting gardens.

All parts of delphiniums are toxic if ingested by humans or animals, containing diterpenoid alkaloids. Handling may irritate sensitive individuals. Despite their toxicity, they are valued in ornamental gardening for dramatic vertical accents and flowers that attract pollinators, particularly bees.