Cheryl,
I know just what you mean - I was referring to the dry brown patches. I find I have them on Pistache and Citronelle. Ironically, I do not have these patches on Dolce Key Lime Pie or any of the other bicolor lighter green heuchs.
I have attached a photo of Pistache that I took in the middle of this past May. You can see the brown spots on the left side of Pistache. I am hoping you find your camera so you can post some pictures for us.
Chris -Great info!