Campanula patula

Willowy and very pretty. A tough cookie I think too.

Spreading Bellfower, a rare wildflower of England and Wales. Loose clusters of starry blue-purple bells on very slender branching stems. Very pretty, self sows in poor soils. Hardy biennial if sown in summer, hardy annual if sown early spring. The stem is branched, erect and wiry and often reddish near the base. In its first year, this plant produces a rosette of short-stalked, slender, spatulate leaves anf a few flowers. In the second year it sends up more flowering stalks. 25 to 80 cm. Seeds need light to germinate and they canit until that time rolls round, even after several years.  

Photos from "Special Plants" as were the seeds.  Run by Derry Watkins near Bath. Derry lectures all over the world and writes extensively - she has been featured in Gardens Illustrated magazine compiling the Plantsman's Favourites - a monthly list of plants that are looking good. Her garden has been on TV several times. She has coauthored with Monty Don.