Why Is My Boxwood Turning Yellow?
I have six boxwood shrubs that are turning yellow and look dead. Early in the spring I pruned off the winter kill leaves, and at that point the shrubs looked pretty good. Now each is showing small areas that are green, but most of each plant is yellow and looks dead. Is this fatal or can they be treated?
The timing of the yellowing suggests that this is winter injury. Internal stem tissues that conduct water and nutrients are often damaged over winter, but the damage doesn't show up on the leaves until the temperature warms, and the plant is no longer able to get enough moisture and nutrients through the damaged conducting tissues. Go ahead and cut them back to the healthy green sections. They can grow out from even a small healthy green section.