Corydalis flexuosa ‘Purple Leaf’ makes an often admired, unusual garden plant. These Corydalis may look delicate, but they’re pretty tough, and enjoy our cool English summers. Flowering can often last from late spring until mid-summer, effortlessly forming clumps in borders, rockeries and shady corners. The foliage is fern-like and purple tinged with red. Its flowers are bright blue and tubular. Height: 15cm (6). Spread: 50cm (19).