Answer: Nuccio's Pearl is hardy to zone 6 and is successfully being grown in Washington DC, Maryland and the Potomac Valley. Flower buds are more cold sensitive than the foliage so the timing of your cold snap may have caused the damage. If the buds begin to develop and then the plant experiences a sudden cold snap, the buds could be damaged. I'd give the plant another chance. It may do fine next year.
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