Lot of yellow leaves on my plants this sprlng what do I do about it?
Boxwoods are subject to several diseases. Read the following article that describes the common ones. Since some disease is fungal or viral, cut out the diseased portions and pick up fallen leaves to keep from other boxwoods getting diseased. Clean tools after using them on a diseased plant. https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/diseases-affecting-boxwoods.htm