Answer: Based on your description it is difficult to diagnose the problem, however hollies require an acid soil and it should be evenly moist but not water logged. You might want to investigate the soil conditions and see what is happening there. Wind burn can also cause yellowing, so it may be a matter of protecting them from wind the first winter or two while they become established. Your county extension may be able to help you test the soil and interpret the results as well as trouble shoot based on examining the foliage.
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