Campanula persicifolia ( Boule De Neige Bellflower )
‘ Boule de Neige ’ cast forth double flowers in white . C. persicifolia forms small clunk of low - acquire foliage sending up marvelous stems of bellflowers in shades of white , megrims and violets . Vast mathematical group of plant in a wide-eyed kind of shapes and sizes . Handsome salad days , typically bell - shaped , blue flower from spring to fall . Leaves at base of plant are larger and broader than stem farewell ....