Campanula Persicifolia

This old-fashioned cottage garden flower makes mats of foliage which slowly creep to form good ground cover and is evergreen in all but the worst winters. From late spring to midsummer the tall stems of wide-open bell flowers, which are cup-shaped and can be either lilac-blue or white, regularly appear, and are very good for cutting. It can flower sometimes as late as September in a cold year.