Hollies dying more pics
Thank you for the additional photos and the plants look healthy.
See our answer to Question 565441.
We have been getting reports of hollies declining this season. We do not know exactly why. This does not appear to be insect or disease related and may be an environmental issue. Last year we had twice as much as our normal rainfall.
In general, if the root systems have been acclimated to a certain environment (grown in dry soils) and the conditions change this affects the roots and the health of the plants; for example standing water, lower spots in the yard, poor drainage, etc.
This is not what you are referring to but wanted to mention that we get a lot of questions on holly leaf yellowing and drop. It is normal for older leaves on hollies to yellow, brown, and drop in the spring. This is normal leaf shedding. https://extension.umd.edu/hgic/topics/normal-leaf-shedding