Blue Edging Lobelia (Lobelia erinus) is a vibrant and versatile plant, native to southern and tropical Africa. It is perennial in warm regions , but is also widely treated as a summer annual in colder climes. Numerous cultivars have been bred, with flowers ranging in hues of white, pink, violet and all shades of blue, from most pale to very dark. The habit is also variable wth some plants remaining uprightly erect, while others decumbently spill and trail.