Campanula – One of the most typical cottage garden flowers, Campanula medium, or “Canterbury Bells”, has a timeless charm and grace. Masses of bells are produced in an astonishing range of blues, whites, and pinks. Flowers appear all summer long and are from 60-90 cm high (2-3 ft). They will grow in almost any position whether sun or semi-shade. Time for planting: April, May, June.