RHS 
Alpine Rockery Annual Biennial
A biennial or short-lived perennial producing an evergreen rosette of silvery-grey leaves. After one or two years an upright flower-spike to about 30cm develops, with shorter, horizontal branches at ground level, all bearing large, bell-shaped flowers in very pale lilac-blue or white
Position
Full sun, Partial shade
Soil Types
Loam, Sand
Max Height
0.1-0.5 metres
Max Spread
0.1-0.5 metres