I have at least 20 hollies around my home in flower beds. Over half of them are dying. What can I do? They were beautiful. Now they are all dying!
Holly can suffer from environmental issues and they are susceptible to some insects, bacterial or fungus diseases.
Inspect the plants more closely to help diagnose the issue.
Are there insects or leaf spots?
Is their yellowing of leaves or dry browning area of the shrubs?
Here are some articles that will help you.