I've built a set of stone steps in my garden and would like to plant the space between the treads with something interesting. It's shady (South facing in the Southern hemisphere) and between blocks of limestone on all sides, with gravel fill at present. I thought rather than sweet violets or Campanula poscharskyana, (both obvious choices) I'd ask here incase someone could recommend a more interesting plant for the position.
Climate - Mediterranean, hot dry summers, cool wet winters, rarely frost
Position - South facing - a little sun in summer, zero in winter.
Soil - any - I can fill with whatever I chose.
Criteria - Obscure, reliable, flowers a plus.
