Maintain a consistent soil pH, apply mulch to the soil, and water regularly to grow a healthy wintergreen boxwood. This is a fast-growing, low-maintenance plant. But using it as a hedge or as a landscaping accent requires regular pruning.
The wintergreen boxwood needs soil with a pH between 6.5 and 7. Test the soil once a year to maintain a consistent soil pH. If the pH is low, use ground rock sulfur. If it is too high, use garden lime. Apply a two- to three-inch layer of mulch around the plant to protect the roots and maintain soil moisture. This layer must be larger than the size of the plant by 12 inches but leave the trunk uncovered. Apply a 10-10-10 fertilizer in the spring 6 inches from the stem.
Yellow leaves indicate a lack of water. Young plants, plants growing in dry areas and plants growing in pots require more water. Check the soil for dryness and check the plant for signs of water deficiency regularly. Water the soil and roots slowly. Make sure abundant water penetrates the soil. Create a soil ring around large plants as a water reservoir.
Create the shape of the wintergreen boxwood by pruning consistently during the first to years of the plant's life. After the shape is established, prune lightly to maintain the shape and remove diseased and broken branches. Prune in late winter and polish in early to mid summer.