wild Holly bushes
The "wild" holly that grows in Virginia and most of the southern and eastern United States is Ilex opaca, American Holly. It can be transplanted and pruned to produce a hedgerow and it's growth rate is considered slow, but it's natural height is 35' to 50' so it will take frequent maintenance to keep it to hedge height.
This fact sheet gives a lot of details and also lists some of the cultivars that have been developed from this native tree. Here is another website with more information.
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