They have clusters of small, tubular flowers in yellow or blue, and delicate, ferny foliage. Look for plants at nurseries in spring and summer. Choose healthy-looking plants with signs of new growth in leaves and flower buds.
Plant corydalis in light shade in well-drained soil.
Add a light application of organic fertilizer to the planting hole. Place the plants no deeper than they were growing in the containers. Set the plants 6 to 12 inches apart. Mulch around but not on top of the plants with 3 inches of organic compost. Water well until soil is completely moist.