Azalea pruning - Atlanta area
I have some very old azalea bushes. Probably planted in the 60s. Pink blooms, small leafs. My friend thinks they are Coral Bells. The largest one is over 6 feet tall. The smaller ones are maybe 2 feet tall. All have been historically sheared into formal ball or hedge shapes. They look great when blooming, but otherwise look thin and empty in the interior. I cut out all of the dead wood last year and tried to open up the plant to increased light in the hope that it would stimulate new growth in the interior of the plant. I see some growth in the interior, but nothing to get excited about. The blooms were destroyed with our recent April freeze so I assume this would be a good time to prune, but I'm not sure how to best "fix" these plants so they are more lush in the interior. Suggestions would be appreciated.