Q.Bowoods turning yellow
If have some boxwoods around 28 years old that are turning yellow and some newer ones around 3 years old. What can I do to save them? Why are they turning yellow? Do boxwoods have a certain life span?
Since your 3 year old boxwoods are yellowing too, it is not an issue of aging or life span. There is something else amiss. And, I have read about boxwoods that are 40-50 years old so your boxwoods are young compared to that!
There are many reasons for boxwoods turning yellow which include winter injury, root rot, nematodes, macrophoma leaf spot, and volutella blight.
The following article will help you pinpoint the cause and provide a course of treatment:
https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/yellow-or-brown-boxwoods.htm