Brilliant blue flowers, like a Tradescantia, on grassy foliage to 30cm. A rarely seen clump forming tuberous plant for a well drained, warm, sunny position. Hardy in most of the UK.
A long lived, clump forming species with narrow triangular leaves and strong, upright, branching stems bearing whorls of light purple flowers in summer followed by good seedheads. Drained soil in sun. 1.5m.
