Evergreen , clump forming herbaceous perennial. Metalic purple buds evolve into dark purple flowers on compact strong stems. Flowers in the summer. full sun and free draining soil. Height 50cm spread 50cm. Hardiness -1c to -5c. Protect the foliage from severe frost by covering with fleece. Feed with (high potash) or Tomato feed June and July to set flowers for next years flowers. Pot size 2lt.