Boxwood Turning Yellow In Summer

Boxwood, a popular evergreen shrub, is known for its lush green foliage and versatile use in landscaping. However, during the summer months, it is not uncommon for boxwood to experience yellowing of its leaves. This can be a frustrating and concerning issue for homeowners and gardeners alike.

There are a number of potential causes for yellowing leaves on boxwood shrubs. One of the most common reasons is a lack of water. Boxwood requires consistent moisture to maintain its vibrant green color, and during hot summer months, it may require extra watering to ensure its roots are receiving enough hydration.

Another potential cause of yellowing leaves is a fungal disease known as boxwood blight. This disease is caused by the fungus Calonectria pseudonaviculata and is characterized by dark brown or black leaf spots and stem cankers. If left untreated, it can lead to severe defoliation and even death of the shrub.

A third possible cause of yellowing leaves on boxwood is a pest infestation. Boxwood leafminer is a common insect pest that feeds on the leaves of the shrub, causing them to turn yellow and eventually fall off. Other common boxwood pests include spider mites, scale, and whiteflies.

To prevent yellowing leaves on boxwood, it is important to provide the shrub with consistent moisture, especially during hot summer months. It is also important to keep an eye out for signs of boxwood blight or pest infestations, and to address them quickly if they are detected.

In addition, proper pruning and shaping of boxwood shrubs can also help to promote healthy growth and prevent yellowing leaves. It is best to prune boxwood in late winter or early spring, when the shrub is dormant, as this will minimize stress on the plant and reduce the risk of pest or disease infestations.

In conclusion, yellowing leaves on boxwood shrubs can be caused by a variety of factors, including a lack of water, fungal diseases, and pest infestations. To prevent yellowing leaves, it is important to provide the shrub with consistent moisture, keep an eye out for signs of disease or pests, and properly prune and shape the shrub. With proper care, boxwood can continue to provide lush green foliage and enhance the beauty of any landscape.