Sky blue is a very welcome colour for garden flowers so Corydalis flexuosa ?Purple Leaf' needs serious consideration if you are looking for a change from pink, red and yellow blooms. Purple Leaf Corydalis has delicate fern-like purple foliage tinged with red forming a backdrop to the long tubular flowers rising above the mound of foliage from May to mid summer. This Corydalis needs to be placed in a border, rock garden or woodland area that benefits from dappled shade where it will grow to form clumps. Height: 15cm (6). Spread: 50cm (19).