balloon flower, tussock bellflower, campanula persicifolia or campanula carpatica purple bell flowers in fall garden

carpatica blue harebell bellflower tussock europe campanula switzerland american carpathian gallen flower bloom bell flora purple nature botanical leaf garden blossom botany petal natural green plant campanulaceae bluebell florist spring summer piperi pretty carpatian european hare glockenblume carpathia herbaceous cultivar arboretum perennial ornamental