I have rusty looking leaves at the base of a mature oakleaf hydrangia. What...
A good guess is that your hydrangea has rust. Sanitation is always important with any disease. Any leaves that fall should be cleaned up. You could remove the affected leaves and/or try a sulphur spray. If you could send good digital photos we could be more sure of the diagnosis. vw
Thanks for your quick response. I will try to send a photo to give you a better look at the problem. It is not widespread at this point and I do wish to halt its spread because I have younger oakleafs in close proximity.. Thanks again.
Silver Spring, MD