Nettle Leaved Bellflower Seeds campanula trachelium – is a wildflower that looks best grown in the shade of a woodland setting or under a hedgerow. Unlike most woodland plants it is late flowering so is useful for providing late summer colour in shady areas. In gardens it can be grown under fences, hedges or walls and will tolerate quite dry soils. Plants have nettle- like leaves and produce beautiful bell-shaped blue flowers from July to September attracting bees.