Genus Ilex Species x meserveae Cultivar 'Heckenstar' Common Name Proven Winners®Color Choice® Castle Wall® Blue Holly Patent ID 14308 Height 5 to 8 Feet Spread 4 to 5 Feet Habit Broad-columnar habit. Moderate growth rate. Zone 5 to 8 Culture Full sun to partial shade. Flower Small, white, in spring. Flower Color Foliage Glossy, dark green with spines. Evergreen. Categories: Evergreen Shrub Holly Proven Winners® Color Choice® Description Use to pollinate Castle Spire® A broad-columnar shaped male blue holly with lustrous dark green leaves.