Holly Bushes Turning Yellow

Question

We have several large holly bushes surrounding our patio. We feed birds in this area (4 feeders of different kinds). The birds (sparrows, mockingbirds, titmice, etc. ) use the hollies for cover and nesting. Several of the plants (the ones closest to the feeders) have many leaves that are turning yellow – to the point where it is heavily noticeable). Could the bird feces and urine be causing this? If that’s not it, what could it be? The drainage is good in the area, and the plants have been fine for over six years.

Answer 1

It is possible that the nitrogen from the bird droppings is causing this. I would recommend having the soil tested at your local extension service. They will be able to confirm the nitrogen levels. This article will help too:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/understanding-nitrogen-requirements-for-plants.htm