Ceanothus azureus 'Concha', 10LRegarded as one of the hardiest Californian Lilacs, 'Concha' is a lovely example of this statement shrub, so familiar in many cottage gardens. In late spring billowing blue blossoms flood over fences or against local dry stone walls, with evergreen foliage. A recipient of the RHS AGM (Award of Garden Merit), for all round excellence in the garden.