most lupins are grown as bienniels, so are sown one year and flower the next then die off once flowered. some of the russell lupins types can survive more than 2 years if you treat then correctly, as soon as the flowers have gone and before the seed pods really start to grow, cut the flower spikes off low down and when new leaves appear lower down, cut off the older ragged leaves higher up, protect in winter if it gets really cold. other than that, make sure you sow new seeds every year or let the seeds self sow from the plant and after several years, you'll have a succession of lupins