The leaves are turning brown and ugly. Need help.
Brown Spots on My Hydrangea Leaves
This is very difficult to answer without a lot more information. Too much sun, not enough sun, too much water, not enough water, your current temperatures, etc. Take a couple of leaves to a good local garden center and get advice from their plant expert. Hydrangeas require a lot of water - try not to get water on the leaves especially if you live in a humid area.