Abstract
Five cultivars of boxwood (Buxus microphylla)—'Winter Gem', B. microphylla var. japonica `Green Beauty', `Green Velvet', `Green Mountain' and `Glencoe'—were planted in twelve different exposures at Manhattan and Wichita, Kan., representing USDA hardiness zones 5 and 6 respectively. The 1995–96 winter was one of great extremes. Lows of –25°C for Manhattan and -23°C for Wichita were recorded, along with sharp 24-hour temperature drops of 31–32°C in January and March. Differences in cultivar performance were noted between the sites. At the Wichita site best winter color was exhibited by `Green Velvet' and `Glencoe', whereas `Green Mountain' sustained some bronzing of foliage due to winter sun. At Manhattan only `Glencoe' in protected locations exhibited good winter color. All other surviving cultivars showed considerable bronzing. In addition, `Green Beauty' was severely damaged at Manhattan, sustaining bark splitting due to low temperatures, although most plants survived at Wichita. Shaded locations on north, northeast and northwest produced best plant quality of all cultivars; whereas, the poorest plant performance occurred on south and southeast exposures.
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