Mopheads—so far as our research suggests—are also known as Big Leaf Hydrangeas. We looked into a few sources and these suggest that yours may be getting too much sun. The little red spiders may also be present; it might be wise for your to review/copare the pics of diseased leaves on the US National Arboretum page below or consult a local nursery (taking a couple of leaves with you).
Here’s the Arboretum page: http://www.usna.usda.gov/Gardens/faqs/hydrangeafaq2.html
Here’s a cooperative extension page: http://extension.uga.edu/publications/detail.cfm?number=C973
Mopheads—so far as our research suggests—are also known as Big Leaf Hydrangeas. We looked into a few sources and these suggest that yours may be getting too much sun. The little red spiders may also be present; it might be wise for your to review/copare the pics of diseased leaves on the US National Arboretum page below or consult a local nursery (taking a couple of leaves with you).
Here’s the Arboretum page: http://www.usna.usda.gov/Gardens/faqs/hydrangeafaq2.html
Here’s a cooperative extension page: http://extension.uga.edu/publications/detail.cfm?number=C973
We hope this helps—