Japanese Holly

Ilex crenata (Aquifoliaceae) is a slow-growing, dense evergreen shrub native to Japan, Korea, eastern China, and Taiwan. Typically reaching 5 to 8 feet tall with a 9-foot spread, it develops a rounded, compact habit with rigid multi-branched stems. The small, glossy dark green leaves (10 to 30 mm) have crenate margins and are spineless or only occasionally spiny, giving the plant a refined boxwood-like texture. It is dioecious, with inconspicuous white flowers followed by glossy black drupes on female plants.

Japanese holly tolerates a range of soil textures from sand to clay but performs best in moist, slightly acidic, well-drained conditions. Full sun to part shade suits it, though it resents hot, humid summers. It responds well to severe pruning and takes shearing readily. Cultivars include the convex-leaved 'Convexa' (5 to 6 feet), the narrow columnar 'Sky Pencil' (6 to 8 feet), and the compact 'Helleri' (4 feet). The species carries significant pest and disease pressure: leaf spot, Phytophthora, scab, spider mites, root weevils, scale, and holly leafminer are all documented.