Any ideas on what could be the issue with this rose bush (Charles de Gaulle)? The other ones to either side (Dolly Parton and Buccuneer to the left and Virgo and Double Delight to the right) are fine and the leaves are dark green, but this one looks like it's dying.
I feed it Black Marvel and have cane mulch around it.
Thanks in advance.
PS Sorry for the poor quality photo.
Charles de Gaulle Rose Bush Looks Sick.