Wilting oak leaf hydrangea
I planted 3 munchkin oak leaf hydrangeas near each other and they had been doing fine. A few weeks ago one started to change to fall colors. I noticed soon after branches started to wilt (as if they were thirsty). I had been watering but to be sure I wasn't over watering, I dug up the plant and checked the roots. It seemed just fine-not too wet, not too dry. A week or 2 later the second munchkin started to change to fall colors. Soon after a branch began to wilt. Some branches on the 2nd are still green and fine, some are in fall color and fine and one is in fall color but wilted.
Is this normal for oak leaf hydrangeas in the fall or could the plants have a desease? The stems seem healthy. I can't see any rot and the roots look fine. In just worried that if it is a desease that it could spread to my many other hydrangeas or Japanese maples.
The first plant now completely wilted;