There are lots of yellow leaves on our bush. The bush is about 10 to 15 years old. Not sure if this is normal?
Certified GKH Gardening Expert
Can you include a photo? If this is in a contained bed, then it could just need some fertilization. Are these newer leaves, or older leaves that are turning yellow?
In the meantime, this article will give you a general idea of the care of most Holly shrubs: https://www.gardeningknowhow.com/ornamental/shrubs/holly/growing-holly-bushes.htm