Yellowing of evergreen foliage can result from under- and over-watering of the tree. Excessive sodium levels can also damage the root system and cause yellowing foliage.
About the Author
Writing professionally since 2004, Charmayne Smith focuses on corporate materials such as training manuals, business plans, grant applications and technical manuals. Smith's articles have appeared in the "Houston Chronicle" and on various websites, drawing on her extensive experience in corporate management and property/casualty insurance.