Corydalis are a native of the temperate Northern hemisphere. They belong to the fumewort family and are a woodland plant liking moist shaded positions. The main attraction of these perennials is their fern like foliage and displayes of deepest blue to lavender tubular flowers held in clusters. Flowers are fragrant, appearing over an extended period from Spring through Summer. Some corydalis do go summer dormant in extreme heat and drought conditions. Corydalis like dappled shade, rich moisture retaining humus based soils which can prevent any drying out in the hotter months.