After choosing an area with good drainage that experiences partial to full sun, dig a hole that is twice the width of the soil ball and the same depth as the boxwood's root ball, and then place the plant in the hole and backfill with a mixture of the removed soil and a nutritive compost. Lay a 3-inch layer of mulch around the plant, and water it thoroughly at the time of planting.
Green Mountain boxwoods are cold-hardy shrubs that usually remain evergreen throughout the year. Boxwoods are mainly grown in the Eastern United States in agricultural zones four through nine.
Fertilize a boxwood with a slow-release fertilizer made of equal parts nitrogen, potassium and phosphorus. Place the fertilizer 6 inches from the stem of the plant in both early winter and spring, recommends SFGate.
Boxwoods require regular watering, especially during the summer. Because boxwood roots are often shallow, SFGate advises against cultivating additional plants near a boxwood plant.
The plants grow to an average of 5 feet in height and 3 feet in width. Because boxwoods grow dense foliage and can be shaped with garden trimmers, gardeners often use the plants as topiary or hedges, an effect accomplished by planting multiple boxwoods close together.