Corydalis is a wonderful little perennial with ferny, rounded blue-green leaves that form a rounded, somewhat irregular mound about 12 to 15 inches tall and wide. It blooms sporadically from May until September, in clusters of tubular, spurred, yellow flowers. Nice in dry shade gardens, rock gardens, woodland settings, and any shady nook where a little yellow cheer would be appreciated.
Grow in well drained, loamy soil in full sun to mostly shade. If content, it will reseed with abandon, growing in crevices, poking out from beneath rocks or stepping stones, though it doesn't usually overwhelm other plants. though it tolerates regular watering, it also does very well in dry shade settings. During the heat of the summer, if the plant looks tatty, cut it back and it will leaf out, and most probably, bloom again.