Phyteuma nigrum Hardy They can grow in dry

They can grow in  dry sites on rocky ground as long as there are humus pockets with plenty of rainfall when in growth

It forms a clump-forming rosette of dark green leaves with prominent white veins

Small (5 mm) flower heads are borne terminally

but they can also come in shades of white and pink

Native to Mediterranean regions it has naturalised further north and into the Pacific Northwest

Phyteuma nigrum Hardy They can grow in dryA purple pretty thing for a border, trough or rock garden. Black Horned Rampion. Native of open spots in woods in Central Europe. For any rich, well drained soil in full sun or partial shade. Excellent in the rock garden. It has a basal rosette of narrow heart shaped green leaves and deep spiky looking, but soft, purple cone shaped flowers on long stems in summer. 30cm H. I photographed it flowering, but now cannot find it. Here is the sort of thing,