My hydrangea is in a pot and gets a lot of sun. I live in the high desert of California. Is it getting too much sun?
My Hydrangea Leaves Are Almost White, Why?
Certified GKH Gardening Expert
Most likely this is sunscald, which is like sunburn in plants. This typically happens to plants that are in locations that are a bit too sunny for them. If possible, move the plant to a location that is not quite so intense or you can try to shade it some by placing a large umbrella (or something similar) over it. It should correct itself over time as the plant acclimates itself.