Campanula cochlearifolia 'Elizabeth Oliver'

Campanula cochlearifolia 'Elizabeth Oliver' is a full double of the species. With light, powder blue flowers. It was introduced into cultivation in the 1970s and apparently takes its name from the daughter of a Mr. Bull, in whose garden it first occurred in Nottingham. RHS Award of Garden Merit and I can see why, untorublesome and simply minutely delicious. Like the species it is a creeping rhizomatous perennial campanulas and  it can get about, bless it, discretely, making a mat of small, rounded leaves, with flowers in summer. Tough! A great spreader, but in a demure way, excellent for nooks and crannies. Perfect for your summer colour trough.