Black spot is common in Annabelle-like hydrangeas (h. One thing that is common in Atlanta is fungal infections and pests of all kinds. I could not see evidence of that for sure in your pictures because the leaves have begun turning their famous fall foliage colors. In hydrangeas, all leaves in too much direct contact with the sun will turn orange/yellow/sandy/white ish, while leaves shaded by other leaves above remain dark green (unaffected). Like I said earlier, leaves turning black is not a sign of sunscorch. Luckily, oakleaf hydrangeas are the most drought tolerant hydrangeas, if there is such a thing. Periods of moist then dry then moist then dry soil are not good for flower buds, blooms and leaves. These problems start in May, when temperatures regularly get above 85F in ATL. Browning issues with flower buds and blooms in May are usually caused by lack of moisture. It would have been nice to know how dry the soil was at the time. But unfortunately, too much time has elapsed since May to be able to confirm your hypothesis. The leaves that you took pictures of do not show signs of sunscorch.
quercifolia) are probably the 2nd most sun tolerant hydrangea. That being said, paniculata hydrangeas can withstand the most sun oakleaf hydrangeas (h. Thus, in some years, they can withstand more sun than in drier years. In wet or cloudy summers, they may not get as much sun for example. Sun exposure however, changes from one year to another. An exposure of 8-9 hours of hot sun is definitely not recommended. Indirect sun is fine and dappled sun is also ok. The leaves otherwise suffer and develop sunscorch. Hydrangeas in my previous home of Atlanta require afternoon shade.
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