Corydalis (Capnoides) sempervirens – Pale Corydalis

General Information: Uncommon in the plant trade, Corydalis features captivating lacy foliage that gives way to tubular, bi-colored pink and yellow, slipper-like blossoms. The delicate flowers and intricate blue-green foliage make for an eye-catching addition to any landscape. Thriving in poor soil, Corydalis are naturally found in woodlands and rocky slopes. A partial shade lover, this species will add a pop of color to the low lighting of a shaded area—a relative with similar foliage to Dutchman’s Breeches. Corydalis is listed as endangered or threatened in several states. Often found in disturbed areas, on cliffs, or rocky areas.  

Cultivation Details:  Corydalis grows from a succulent root system and does best in dry sunny to partly sunny areas of slopes, woodland edges, rocky or sandy soils. Ideal in a rock garden setting. Clump-forming, it can grow as an annual or a biennial depending on when seeds are sown.

Pale Corydalis prefers cooler environments. Blossoms occur June – September. Although an annual (sometimes biennial), Corydalis reseeds readily, so it is best to provide an open area with minimal competition to allow seedlings space to emerge and take hold. This biennial is a tough plant, but it will appreciate the space to reseed. Attracts long-tongued bees, particularly bumblebees. The seeds of Corydalis, like those of Trillium and Violets, have an elaiosome (nutrient-rich food package appendage) that attracts ants. The ants take them back to their nest, helping distribute the seeds as the seed portion is left unharmed after the elaiosome is consumed. This process is referred to as myrmecochory. The nectar-rich flowers are also often visited by Skipper butterflies. There are no significant insect or disease problems.  Rabbit-resistant. Sometimes becomes weedy.

Growing Requirements: Plant in full sun to part sun, average to dry soil. Prefers well-drained soil and cooler environments. Prefers an acidic to neutral pH.