Discolored rose petals piled in a corner.  Dead rose heads were bending off their stems.“Every time I come here, I get itchy fingers because I want to prune the roses,” said Carol Braves, grasping a pair of clippers as she stared at a limp-looking pink rose bush that was almost as tall as she was.  “I feel like a kid in a candy store right now.” For more than 75 years, Oakland’s famous Morcom Rose Garden has been a beautiful…