10 seeds per packet. We have a name for this previously unknown species C. petrophila. A clump forming, dwarf species from China, producing attractive, finely dissected, fern-like foliage and tubular, white and pale lilac-blue flowers from late spring into early summer. A short lived species but produces plenty of seeds.Height 18 cm. Moist, well-drained soil in part sun to part shade. Cold germinator.