Dainty, fully hardy perennial for a sunny or lightly shaded position in reasonably good, fertile soil that does not get very dry. Finely divided foliage, largely evergreen. In early summer tall flowering stems are topped with clusters of richly coloured sky blue flowers with an exquisite 'sweet pea' fragrance. Good for bees and butterflies. Polemonium 'Northern Lights will grow to about 50cm tall in good garden soil.