bell-shaped flowers blue flowers campanula rotundifolia Harebells nature. summer flora summer garden summertime garden flowers. lily of the valley nature small white flowers spring Spring flowers spring garden white bell-shaped flowers city garden Green leaves natural white/green bell- shaped blossom. appearance bell-shaped biennials blooming blooms clump-forming colored colorful colors coloured colourful colours cultivars decorative Digitalis display distinctive downward-facing erect exotics flora floral flower-spikes flowers foxglove garden garden-flowers garden-plants herbaceous horticultural horticulture light mottled ornamental perennials petals plants potent-glycosides shape shaped shapes tall-spikes textures toxic toxicity tubular unusual whorls