Deb

You might even see tiny new buds starting back along where the foliage is dying off.

And something that a nurseryman suggested to me when I had an unhealthy rhododendron was a teaspoon of epsom salt in a gallon watering can. Supplies a mineral that is often missing or not abundant enough. He went on to say that it doesn't hurt to put a pinch in houseplant water periodically. Helped green up my rhododendron immensely.