It was only when huge areas of Iceland started turning purple that authorities realised they had made a mistake. By then, it was too late. The Nootka lupin, native to Alaska, had coated the sides of fjords, sent tendrils across mountain tops and covered lava fields, grasslands and protected areas.
Since it arrived in the 1940s, it has become an accidental national symbol. Hordes of tourists and local people pose for photos in the ever-expanding fields in June and July, entranced by the delicate cones of flowers that cover the north Atlantic island.
