A green gem boxwood is a shrub that is part of the Buxaceae plant family. It is a dwarf variety that develops into a dense ball shape. Landscapers utilize the plant as a hedge or as an edging shrub around a garden. The shrubs typically grow well in U.S. Department of Agriculture Hardiness Zones 4-9.

The green gem boxwood was produced from two species within the genus Buxus. Buxus microphylla var. koreana and Buxus sempervirens were crossbred to produce the green gem boxwood. It was introduced in Ontario, Canada, by Sheridan Nurseries. Buxus microphylla is native to eastern Asia and Buxus sempervirens is native to Europe.

This evergreen shrub typically grows 2 to 4 feet (0.6-1.2 m) in height and width. It features dark green foliage that is densely packed in a mound shape. The foliage becomes slightly bronzed during the fall. In the spring, the green gem boxwood produces small, white flowers. The flowers are usually not very noticeable.

It is recommended to grow the green gem boxwood in well-draining soil that is neutral in pH. The area in which the plant is placed should have exposure to sunlight for optimum growth, but the shrub can thrive in partial shade. This plant can also thrive in drought conditions for a limited period of time.

The first season of a newly planted green gem boxwood requires regular watering to establish a root system. It also needs fertilizer in the spring to help with growth. Overgrowth can be controlled by pruning.

This shrub can be used in a variety of landscape designs. As a topiary, this shrub can be pruned into perfect spheres. It can be planted as a specimen as well. Some plants which can be planted with the green gem boxwood include roses and rhododendrons.

It is best to protect this shrub from the winter wind because it tends to cause the tip of branches to die. These branches should be removed before the new season to promote new growth. Other problems that affect the green gem boxwood include pests and fungal disease.

A common pest which affects this plant is the boxwood mite. It feeds on the upper and lower surface of leaves and usually causes discoloration. Applying insecticidal soap to the foliage can reduce the infestation.

Phytophthora root rot is a fungal disease which affects the roots of this plant. It prevents the roots from absorbing nutrients from the soil. This causes the leaves to bronze.