Genus Buxus Species microphylla Cultivar 'Bulthouse' Sprinterâ„¢ Common Name Sprinterâ„¢ Boxwood Patent ID PPAF Height 2 to 4 Feet Spread 2 to 4 Feet Habit Upright, rounded habit. Fast growth rate. Zone 5 to 9 Culture Full sun to partial shade. Flower Insignificant. Flower Color Foliage Glossy green foliage. Evergreen. Categories: Evergreen Shrub Proven Winners® Color Choice Description Photo courtesy of Proven Winners.