Blue Corydalis flowers
(Photo courtesy of NetPS Plant Finder)
Height: 12 inches
Spread: 18 inches
Hardiness Zone: 4b
Other Names: Fumitory
A wonderful variety with elegant blue flowers rising above interesting ferny foliage; evergreen in mild winter areas; creates a stunning groundcover when massed
Blue Corydalis has masses of beautiful spikes of fragrant blue tubular flowers rising above the foliage from mid spring to late summer, which are most effective when planted in groupings. The flowers are excellent for cutting. Its ferny compound leaves emerge deep purple in spring, turning bluish-green in color the rest of the year. The fruit is not ornamentally significant.
Blue Corydalis is a dense herbaceous evergreen perennial with a mounded form. It brings an extremely fine and delicate texture to the garden composition and should be used to full effect.
This is a relatively low maintenance plant, and should be cut back in late fall in preparation for winter. Deer don't particularly care for this plant and will usually leave it alone in favor of tastier treats. It has no significant negative characteristics.
Blue Corydalis is recommended for the following landscape applications;
Planting & Growing
Blue Corydalis will grow to be about 12 inches tall at maturity, with a spread of 18 inches. Its foliage tends to remain dense right to the ground, not requiring facer plants in front. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years. As this plant tends to go dormant in summer, it is best interplanted with late-season bloomers to hide the dying foliage.
This plant performs well in both full sun and full shade. It requires an evenly moist well-drained soil for optimal growth. It is not particular as to soil type or pH. It is quite intolerant of urban pollution, therefore inner city or urban streetside plantings are best avoided, and will benefit from being planted in a relatively sheltered location. Consider applying a thick mulch around the root zone in both summer and winter to conserve soil moisture and protect it in exposed locations or colder microclimates. This species is not originally from North America. It can be propagated by division.
Blue Corydalis is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.