Clean deeply veined foliage, closely packed, cupped/frilly looking sepals on heavily pigmented heads, small to mid in stature.....Looks like Mathilda Gutges to me...That's my best guess anyway.....yg Here is a link that might be useful:

Hello, Annie. A picture would be very useful in this case since now is a time when many hydrangeas develop fungal diseases. Leaf spot is the most common and, at times, looks like brown spots. Most people take no action this late in the year because the plant is about to go dormant and the leaves will dry off. At that point, you can just throw the leaves in the trash (not the compost bin). Hydrangea blooms change color many times throughout the year, specially in the fall. Many colored varieties will be turning brown this time of the year so, if yours is doing this, it may be doing that simply because it is "that time of the year". That is not to say that this is THE reason though. Premature change of color towards brown can also indicate that the plant is not getting getting enough water. Since you are concerned about watering issues, manually check it. On a daily basis, insert a finger into the soil to a depth of 4" and see how the soil feels. If it feels dry or almost dry then water. If it feels moist, do nothing. If it feels wet, try to see why since the soil should not be wet unless it has recently rained or something like that. After a while, you should notice that you are watering on a certain schedule (every two/three/etc days) so set your sprinkler to water on that frequency. As the temperatures change (10-15 degrees) and stay there, you may want to manually recheck. By the time your plant goes dormant, you can reduce watering to once a week or once every two weeks. Remember to water during dry winters too. Jfraga, what variety of hydrangea do you have? Browned leaves that start brown in the edges indicates lack of moisture so check your plant as I described for Annie and water it. If you have a small (new) shrub, you can start with 1g of water every time you water. Does that help you guys? Luis

There was another post similar to this recently and those spots were accredited to the rain. They should be fine when it starts to dry up.

The brown spots appear to be common hydrangea leaf spots, sometimes a fungal infection called Cercospora Leaf Spot. See here for more info: http://www.aces.edu/pubs/docs/A/ANR-1212/ANR-1212.pdf Most of the time, this is caused by overhead watering. If you do this, try watering the soil instead and do it very early in the mornings. Clean up plant debris that may contain spores, discard leaves in the Fall on the trash and, if you can afford it and the problem is bad enough in your opinion, replace the mulch too. You can also apply fungicides and the article mentions some of them but they can be $$ expensive so I just follow those suggestions when it comes to the ones that I too have with leaf spot. I am not sure about the loss of leaves. Sounds mysterious since you have not mentioned anything that would account for that. Normally, this would require something like not watering it (the rootball dries out for example), winter damage or applying insecticides or fungicides to the plant or to nearby plants. Leaf spot can make the plant loose some of these leaves as they first appear to have the lesions and sometimes the leafs brown out and fall. But usually the infestation is not THAT bad. If Bluebird lost the leaves in this way then you may want to spray after all as that is kind of a big thing in my opinion. I normally see this issue on mine by late August or in September so this is kind of early. And I just live with the problem until the plant goes dormant in December. Then I carefully cut the leaves off without touching the stems (invisible 2016 Spring flower buds will usually be near the end of the stems).