Campanula portenschlagiana or the Bellflower is a lovely and delicate, spreading, evergreen, perennial that has heart shaped small green leaves and produces beautifully simple, deep blue/purple star or bell shaped flowers in summer and autumn.
Campanula portenschlagiana likes to hang onto or over low walls or rockeries and looks very pretty at it too.
Colours are richer for the more shade given and it is reasonably frost hardy.
Perfect for informal and cottage style gardens, especially cascading over walls or rockeries.