A hardy perennial that will grace dark and shady areas of the garden with vibrant yellow tubular flowers from may to september corydalis 39canary feathers39 is a delight this vigorous garden beauty has clusters of yellow blooms contrasting with its upright blue45grey feathery foliage and is one of the most floriferous of all the corydalis family plant 39canary feathers39 in light woodland under shrubs or trees or in dappled shade in pots or borders and it will reward you with