He uses, 'Beside the lake, beneath the trees', and 'beside' to give the impression that no matter where he looks he can see daffodils. The simile compares the flowers to a sparkling and endless constellation of stars in the galaxy which is a powerful image as the milky way is a significant part of the world's solar system and makes the flowers seem important/stars light up the night/these flowers light up the path from winter to spring Enjambment adds to the idea of endlessness and infinity - like the flowers go on for ever.
