About Pseudofumaria lutea (L.) Borkh.
Pseudofumaria lutea, commonly called yellow corydalis, grows between 30 and 38 cm (12 and 15 inches) tall. Its leaves are finely divided, ranging in color from yellow-green to gray-green, and often stay green through the winter. The flowers are 2 centimeters (0.75 inches) long, arranged in racemes on short, branched, leafy stems, and bloom from late spring to autumn. Each flower has 4 petals: the top and bottom petals are crested, the top petal has a short, rounded spur that curves downwards, and the two inner petals are connected at their tips. Its dark brown seeds, which have white elaiosomes, are held in oval, flat pods. This plant self-seeds very abundantly. In cultivation, yellow corydalis is hardy to -34 °C (-30 °F), which corresponds to hardiness zone 4. It grows best in locations with light shade and consistent good moisture, but it can tolerate both full sun and deep shade. It grows naturally in cracks in old walls, where drainage is excellent.
