Yellow Corydalis,Corydalis lutea, is a perennial plant that is used in woodland borders and rock gardens. Yellow corydalis has attractive yellow tubular flowers and mounding blue-green foliage for shady areas of your yard and garden.
Yellow corydalis is grown in Zones 4-8 and grows in a rounded form. It tolerates full sun or partial shade and prefers fertile, well-drained soil with a pH of 5.5-7.0. This plant will grow to about 15 ‘ high and 12 “ wide. Its fern like leaves form mounds that are attractive throughout the growing season.
Tiny, tubular yellow flowers appear from late spring into early fall. Place yellow corydalis among rocks, in the perennial border, at the edge of the woodland, or in containers. Good companions include ‘Alba’ fringeleaf bleeding heart, ‘Moonbeam’ threadleaf coreopsis, ‘Rubra’ Japanese blood grass, and ‘White Swirl’ Siberian iris. This is a great yellow plant for your rock garden.
Care of Yellow Corydalis
You should plant the corydalis 12” apart in spring or fall. Apply slow-release granular plant food at the time of planting. Water deeply when the soil is dry. Plants will self-seed but will not be invasive. After frost cut back collapsed foliage.
Propagating Yellow Corydalis
Propagating of this plant is done in spring or early fall. You can divide them by digging around the root clump and lift. Use a sharp spade to slice through the root system. Reset portions that contain healthy roots and top shoots. The yellow corydalis is relatively pest free, but rust and downy mildew occasionally occur. Many related species are available. C. Flexuosa (Zones 6-8, 12” high) has neon blue tubular blooms from late spring to summer and prefers partial shade. ‘Blue Panda’ (8” high) has bright blue flowers.
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