Giant Bellflower Seeds campanula latifolia – is a wildflower that grows in open woodland and under hedgerows. In gardens it can be grown under fences, hedges or walls and as a backdrop to a wildflower border. Plants produce beautiful bell-shaped blue, sometimes white, flowers in July and August. Giant Bellflowers look best growing with other plants that bloom in mid-summer such as Oxeye daisies, Greater Knapweed, Foxgloves, Meadow Cranesbill and Small Scabious.