Ceanothus × delileanus ‘Henri Desfossé’ is a summer-flowering, deciduous shrub prized for its intense cobalt-blue blooms and adaptable growth habit. As temperatures rise, it sends up elongated plumes of densely packed blue flowers that create a vivid display against its clean green leaves. Unlike spring-flowering evergreen types, this cultivar performs later in the season, extending interest well into mid and late summer. Its upright, slightly arching framework gives it a natural presence in sunny borders, where it blends easily with perennials and ornamental grasses. Hardy and straightforward to grow, it offers strong seasonal colour without demanding specialist conditions.