North Carolina is a big place and varied growing conditions. I think the USDA hardiness zones are from 6a to 8b I agree it would depend on exactly what climate zone, growing conditions and which type of Azalea. There are (I think) about 16 native Azaleas to choose from, each has somewhat different requirements. Maybe start by selecting the varieties which would like to grow in your zone and in your garden micro-climate; that could narrow down the answers.
