I don't grow it here near Reading, PA (SE PA), Zone 6, but see it down near Philadelphia. It would be worth a try in Zone 7A.
R. ponticum grows to 4' in 10 years. It is hardy to -5F. It is a tough and adaptable species that was formerly used as grafting rootstock. R. ponticum 'Variegatum' has variegated foliage with white streaks and purplish flowers. It is native from Spain & Portugal to SW Russia and Lebanon.

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Thanks Rhodyman. I told my wife I'd not buy and kill anymore rhodies, but this one has me tempted to try again.

Perhaps if I can really open up the root ball before planting it, it might have a chance.