Herbaceous plants suitable for carpet effects in the rock garden. Plant in autumn or spring in any ordinary soil in a sunny position. Seeds may be sown in April. Also increase by cuttings of side shoots put into a cold frame in spring, or by division of plants in autumn or spring.
G. alpina has violet flowers in summer. Fragrant. 3-in.
C. grandijlora, rose-pink. Height 1-ft.