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Why Is My Boxwood Dying?

By Pamela Gardapee ; Updated September 21, 2017

Boxwoods are used as an accent, privacy screen, and hedge and border plant in contemporary, traditional, historical and colonial garden landscapes. One or more reasons can cause the boxwood to start dying. It may be improper care or a disease that affects the plant’s root system.

Root Rot

American and English boxwood varieties are susceptible to root rot. Leaves turn a light green, and then can proceed to turn a straw-color, bronze or yellow. The leaves tend to curl upward. The bark will separate from the base of the plant as it dies. By the time you notice the symptoms, most of the roots could be dead and brown in color instead of white. Root rot in boxwoods is the result of wet or soggy soil.

English Boxwood Decline

English boxwood decline is a disease that usually affects plants that are more than 20 years old. The symptoms will resemble those of root rot, but the disease is the result of drought stress. Boxwood plants affected by this disease will have discoloration of the veins in the main stem. By the time you notice the drought stress that rots the roots, the plant will be severely affected.

Watering

After transplanting boxwoods, you need to give the plant at least 1 inch of water each week during the summer until the plant becomes established. In some areas, it may take two years for the plant to become established. Keep a 2- to 3-inch layer of mulch around the plant to help retain the moisture in the soil. If the plant doesn’t receive 1 inch of water per week during fall, leading up to winter, water the plant until the first freeze to help keep the plant from bronzing during the winter.

Fertilizer

Plants need 10-10-10 (nitrogen-phosphorous-potassium) fertilizer in late winter or early spring before any new growth is noticed. Pour the fertilizer around the base of the plant, but 6 inches away from the stem of the boxwood. If you fertilize the plant in late summer, the plant will continue to grow and become susceptible to cold and frost damage, which will cause the plant to die. If you haven’t fertilized the boxwood and it has yellow leaves on the bottom of the plant or the leaves are falling off of the plant, it could mean a lack of nitrogen.

 

About the Author

 

Pamela Gardapee is a writer with more than seven years experience writing Web content. Being functional in finances, home projects and computers has allowed Gardapee to give her readers valuable information. She studied accounting, computers and writing before offering her tax, computer and writing services to others.