Delphinium tricorne – Dwarf Larkspur

General Information: Dwarf Larkspur is a true spring native ephemeral, a perennial related to the Common Larkspur (Delphinium). This species is distinct in being thinner and earlier to bloom than other members of this species. Distinctive, deeply lobed leaves emerge in the spring. The bluish-purple flowers have a white center, a folded rear-facing petal that forms a nectar spur, and bloom from July to September. Following the flowers, attractive three-horned seed pods emerge, which split open in late fall. This species attracts pollinators, particularly Long-Tongued Bees, Butterflies, and Moths, and is a host plant to the Darker-Spotted Straw Moth (Heliothis phloxiphaga).

Cultivation Details: Dwarf larkspur is toxic when ingested. It does not tolerate very humid summers and fares best when protected from exposure to harsh winter elements. Naturally occurs in mesic woodlands of North America and as such, the soil should remain consistently moist but never very wet or very dry, like the conditions on a forested hillside. Dwarf Larkspur is ideal for rewilding, cottage gardens, woodland gardens, native gardens, mass plantings, border plantings (especially along shady walls or fences), and foundation plantings. Consider pairing with other shade-tolerant species such as Ostrich Ferns (Matteuccia spp.), Wild Ginger (Asarum spp.), Great Blue Lobelia (Lobelia siphilitica), Doll’s Eyes (Actaea pachypoda), Large-Flowered Bellwort (Uvularia grandiflora), and many more!

Growing Requirements: Plant in partial shade. Most successful in areas that receive morning sun and afternoon shade, as these conditions keep the leaves dry and prevent fungal issues. Prefers moist, well-drained soils. Prefers loamy and clay soils. Tolerates sandy soils if sufficient organic matter is incorporated as a soil amendment. Suitable for neutral and mildly alkaline soils. Does not tolerate acidic soils.

Fun Facts: The species name “tricorne” means “three horns” and refers to the seed pods these plants produce.