Yellow leaves- please help
I have many azaleas that are about 10 years old and have always done well. One of them now looks terrible though. It's leaves have really thinned out and all of the remaining leaves are yellow/very light green. They are not "veiny" like they get if they need iron, just an overall bad color. Any suggesstions of what this plant needs? It just bloomed and it was covered in blooms. If I prune it back it will be just a large hunk of branches because it only has leaves on the outer 2-3 inches. The entire plant is about 5 feet tall. Thanks!