I have a rhodie that was planted last year. It seemed to be doing well, but just today I noticed how sickly it had become. Many leaves are yellowing and falling off, and I notice that the stems are likewise yellowing. Is this a ph issue? The picture I have attached was from a few weeks ago, but I notice today that the yellowing is apparent in the picture. I did not notice it then.

The rhodie is planted in a eastern-facing exposure, part-sun. I think it is a Bessie Howell or Roseum (I forget which). I water less than I probably should, even though it has been hot, as I do not want to rot the roots. I tried to plant in a mound, but I think I didn't do enough. If I dug it up and replanted it, would that help?

I love this plant and do not want to lose it. :(

~~Brandy