You may have
seen the Purple Daisies (Berkheya purpurea) at RHS Rosemoor in Devon. Purple Daisies
come from the mountainous areas of Southern Africa. They are not
difficult to grow and are becoming increasingly popular garden plants. The
plants flower in the first year - and they are long lasting perennials for
milder UK climates. Sow indoors in early spring, germination takes 2-3
weeks and plant out after the last frost for mid to late summer flowers.
Treat them like Dahlias and you could have them for many years.

Berkheya purpurea, RHS Rosemoor