An evergreen dwarf shrub that spreads over the ground forming a dense mat. Small, 3 cm across, deep green leaves. Stems grow between 30 and 80 cm annually. It bears attractive flowers that vary in colour: blue in the species and blue, purple and white in the cultivars. It’s best grown in partial shade or shade and in moderately moist soil. Plant 10 plants per square meter. Sufficiently frost-hardy.