Azaleas have shallow roots, but none should be above ground. You should push it back down or cover it up with a little bit of soil...otherwise the root could dry out and possibly harm the plant.

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If the soil the azalea is in is clay, it might not have enough drainage. I've planted azaleas and rhododendrons with as much as half of their rootballs above ground to provide better drainage. But you still need to cover the rootball well with mulch.

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Terry

May the force be with you