Hydrangeas: What are these grey spots?, 1 by evitaa2007

evitaa2007 wrote:
Hi everyone! Can anybody help me identify what is going on with this plant? I purchased this Dooley hydrangea from a good local nursery about 6 weeks ago. After I got the plant home, I noticed these little grey spots on some of the leaves. Rather than go through the hassle of taking it back I planted it in a good location (AM sun PM shade) and it has done pretty well so far. The new growth is starting to show some spots, too. Is this something that will correct itself or do I need to treat it? Thanks in advance!
Elizabeth