California lilacs (Ceanothus spp.) offer clouds of fragrant blue flowers in spring or early summer, depending on variety, against evergreen glossy foliage that birds use for shelter. Sizes range from ground‑hugging 60 cm carpets to 4 m shrubs, all thriving in full sun and fast‑draining soil with minimal water once established. Excellent for coastal, xeric and pollinator gardens. Avoid hard pruning into old wood; instead, remove a third of flowered shoots after bloom to maintain shape.