I have about 30 skip laurel bushes set in a row. They are now about 15 feet tall (5 yrs old). The leaves are turning yellow at bottom and middle. They will all fall off soon. This just happened in the last month.
Certified GKH Gardening Expert
I would fertilize and also treat the plant with a fungicide, as these two things will help fix many of the other possible causes for the unhealthy plants.