Prepare the flower bed before replanting your azalea by tilling the soil and adding in nutrient-enriched soil and fertilizer. Make sure the new soil and fertilizer are mixed in well with the existing soil.
Dig a hole twice as wide as the root ball of the azalea and several inches deeper. Make a small mound in the center of the hole that will allow the root ball to be raised slightly above the flower bed. Save the remaining soil to refill the hole.
Loosen the roots on the root ball carefully and cut away any new roots growing around the root ball by making 1/2-inch-deep cuts with a sharp knife.
Place the plant's root ball in the hole on top of the dirt mound in the center. Allow the roots to fall into the deeper part of the hole so they can spread out and grow.
Fill the hole with soil until level with the rest of the flower bed. Carefully pack it around the root ball as you go along by pressing down gently with your fingers.
Cover the area immediately surrounding the azalea with mulch about 2 to 4 inches high.
Water thoroughly. Continue to water at least once a week for the next month to remove any air pockets around the roots.